US3318699A - Process and material for the development of diazotype copies - Google Patents
Process and material for the development of diazotype copies Download PDFInfo
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- US3318699A US3318699A US402946A US40294664A US3318699A US 3318699 A US3318699 A US 3318699A US 402946 A US402946 A US 402946A US 40294664 A US40294664 A US 40294664A US 3318699 A US3318699 A US 3318699A
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- Prior art keywords
- alkaline
- diazotype
- support
- radiation
- substances
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/18—Diazo-type processes, e.g. thermal development, or agents therefor
Definitions
- the present invention relates to reproduction processes and refers more particularly to a process and material for the development of diazotype copies.
- the photosensitive copying material containing a diazo compound and a compound capable of coupling with the diazo compound is developed by the action of alkaline-reacting substances.
- an azo dye forms in the areas not alfected by light, thereby making the image visible.
- Gaseous ammonia is Widely used as the alkaline developer in practice today. However, it would be desirable to avoid the use of ammonia or other gaseous substances which must always be present in excess to insure thorough development, since special devices are required to prevent escape of gas from the developing equipment.
- Liquid alkaline developer solutions have also been used. By using these, the disadvantages of development wtih gas are substantially avoided, but the resulting copies are obtained in moist form which in many cases is undesirable (for example, when making many copies in ofiices).
- Diazo materials contain ing such substances have the following disadvantages: relatively poor storability and stability, and for development, high temperatures and prolonged developing times requiring lengthy warm-up period even in insulated equipment.
- the process is characterized by allowing infrared radiation to act briefly on a developer sheet comprising a support, infrared-absorbing matter, and at least one alkaline-reacting substance in free or combined form.
- a developer sheet comprising a support, infrared-absorbing matter, and at least one alkaline-reacting substance in free or combined form.
- this alkaline-reacting substance which is disposed in surface contact with the imagewiseexposed diazotype material changes its aggregation to one of gas, vapor, or liquid.
- the alkaline-reacting substance is transferred to the surface of the diazotype material and creates the proper alkaline environment necessary for development.
- one object of the present inevntion is to provide a process and material for the dry development of diazotype material, which overcomes the disadvantages of the prior art.
- Another object is to provide a process and material for the quick, dry development of diazotype materials having excellent shelf life.
- the alkaline-reacting substance and the infrared absorbing matter may be on the surface of or inside the support.
- Suit-able supports are paper, plastic foils, metal foils, and the like.
- the paper may contain the infrared-absorbing matter such as carbon black and the alkaline reacting substance uniformly dispersed in finely-divided form over the whole of the paper.
- a developer sheet may be obtained 3,318,599 Patented May 9, 1967 ice by impregnation of commercial porous paper loaded with carbon black with suitable solutions of the alkaline-reacting substances.
- Non-porous paper or papers whose pores are closed by an impermeable coating may contain the alkaline-reacting substances in the form of a thin surface layer.
- the papers may have both the alkaline-reacting substance and the infrared-absorbing matter applied to one or both surfaces of the paper support.
- both the alkaline-reacting substance and the infrared-absorbing matter may be added to the plastics during casting, in the melt, or during extrusion, and the resulting developer sheet contains these substances in a homogeneous distribution.
- this possibility may only ⁇ be utilized when the melt or the extrusion temperature of the plastics is below that at which the alkaline-reacting substance becomes active as developer with a change in its state of aggregation.
- the plastic films may contain carbon black homogeneously distributed within the support and the alkaline-reacting substance on their surface.
- the infrared-absorbing matter may also be applied together with the alkaline-reacting substance to the plastic support surface which expediently faces the diazotype coating.
- the infrared-absorbing matter may be applied to the surface facing the source of radiation, and the alkaline-reacting substance may be applied to the surface facing the diazotype coating. Both substances may also be present together on the surface in contact with the diazotype material.
- Liquid alkaline substances With which the support may be impregnated transfer themselves to the diazotype material by distillation. Solid alkaline-reacting substances are converted into the molten state and then transferred to the diazotype material. Moreover, solid alkaline-reacting substances may also be vaporized onto the diazotype material by sublimation.
- a particularly advantageous embodiment of the process is one in which the alkaline-reacting substance is initially not in free form but in physically or chemically combined form, is liberated by the action of heat, and transfers itself onto the diazotype material as gas, vapor, or in the form of a melt.
- Coatings which contain the alkaline-reacting substance in such combined form are distinguished by a particularly high stability and long shelf life.
- Alkaline-reacting substances which may be used in free form are aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic amines which are sublimable, distillable or fusible at the temperatures generated by the infrared radiation. They may be of primary, secondary, or tertiary nature. Diamines and polyamines may also be used. The hydrocarbon radicals of the amines may contain functional groups, provided these do not have a deleterious efiect on the production of photocopies. Thus, hydroxy alkylamines or alkoxy alkylamines may be used.
- Aromatic amines may also contain hydroxy, ether, thioether, ester, keto or nitro groups on the nucleus, or fluorine, chlorine, or bromine atoms.
- Amines or substituted amines which have an injurious effect on the human system are not used.
- amines with very high carbon numbers generally used because at the preferred temperatures in the present process (50 C. to 200 (3.), they are undistillable, unsublimable, or infusible, or only very difiiculty so. Amines with not more than 30 carbon atoms are therefore generally preferred.
- alkylamines such as N-dodecylamine, oleylamine, and stearylamine
- lower alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, l-aminopropanol-3, and triisopropanolamine
- lower alkylene diamines such as ethylene diamine and 1,6-diaminohexane
- araliphatic amines
- amines such as benzylamine; and aromatic amines such as aniline, o-toluidine, rn-toluidine, p-toluidine and alphanaphthylamine.
- aromatic amines such as aniline, o-toluidine, rn-toluidine, p-toluidine and alphanaphthylamine.
- Polyalkylene-polyamines may also be used.
- Suitable substances which produce a liquid or volatile alkaline-reacting substance are urotropine, urea, thiourea, methylurea, ethylurea, methylthiourea, guanidine, and the ammonium salts of monobasic or polybasic inorganic or organic acids, especially carboxylic acids.
- Examples are ammonium carbonate, ammonium formate, ammonium acetate, ammonium succinate, ammonium lactate, ammonium citrate, ammonium tartrate, ammonium phthalate, and ammonium benzoate.
- ammonium salts in which the liberated acid by-product has a deleterious effect on the production of photocopies are not used.
- the ammonia or alkaline-reacting substances may also be used in the form of complex, inclusion, or absorption compounds which liberate the base at the temperature used.
- Sublimable, distillable, and fusible basic substances may be mixed with substances which do not form a base until they are heated together.
- Substances capable of wholly or substantially absorbing infrared rays for the present invention are varieties of carbon such as carbon black, animal charcoal and graphite.
- the alkaline-reacting substances are applied from aqueous or organic solutions to a support capable of absorbing infrared rays.
- binding agents may be added to the solution.
- agents may be polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl acetate, after-chlorinated polyvinyl chloride, polystyrene, polyamides, or polyesters.
- a suitable developing sheet may also be obtained by coating the support with a melt or by extrusion of a mixture of the alkaline-reacting substances with waxes or thermoplastics.
- the waxes together with the alkaline-reacting substance transfer themselves to the diazotype material.
- the impregnation of the support is likewise effected with the aid of suitable aqueous or organic solutions of the alkaline-reacting substances.
- the temperatures which these radiators produce in the absorption coating are expediently between 50 C. and 200 C. Especially preferred are temperatures between 100 C. and 150 C.
- the active period of radiation on the developer sheet consisting of support, the infrared-absorbing matter, and the alkaline-reacting substance is several seconds and is generally not greater than ten seconds.
- the developer sheet is preferably disposed between the diazotype material and the source of radiation, but this is not absolutely necessary.
- the infrared radiation may :also be directed from the side of the diazotype material. This applies to a metal support bearing the alkaline-reacting substance on the surface facing the diazotype material.
- One expedient embodiment of the process consists in covering the exposed diazotype material of a specific size with the developer sheet of the same size, and passing the two-ply assembly at a speed of several meters per minute through the radiation field of an infrared radiator while the diazotype material and the developer sheet are in close contact with each other.
- the radiator may be focused.
- the developer sheet As an endless strip over two or more rollers.
- the developing process then takes place in the space between two rollers.
- An ordinary commercial radiator fitted with a contact switch and designed to radiate only during the period necessary for actual development may be used,
- Example 1 A tissue paper permeated with carbon black at a coating weight of 30 grams per square meter was impregnated with a ten percent aqueous solution of ammonium carbonate. After drying, one sheet of the impregnated material was laid on an exposed ordinary commercial photocopying diazotype paper. The two papers were then passed at a rate of several meters per minute through the focal line of a focused infrared radiator with an output of 1,350 watts. Care was taken by means of rollers to insure good contact between the two papers. The infrared radiation was absorbed by the carbon black to generate heat of about 120 C. As a result, the ammonium carbonate decomposed into ammonia and carbon dioxide. The liberated ammonia permeated to the surface of the photocopying material where coupling took place in the unexposed areas due to the alkaline reaction of the ammonia, and the desired visible image was obtained.
- Example 2 A solution of ten grams of urotropine, one gram of triisopropanolamine, and two grams of polyvinyl acetate in cc. of chloroform was applied to a carbon tissue paper loaded with carbon black. After evaporation of the chloroform, a firmly adhering coating with good shelf life was obtained on the support material. Coating was used for the development of diazotype copies with the action of heat, as described in Example 1.
- Example 3 Fifty grams of an ester wax with a melting point of 7882 C. were melted into 20 grams of triethanolamine. The melt was applied by mechanical means to a wax paper base impregnated with carbon black and having a coating weight of 30 grams per square meter. The same procedure was followed as in Example 1. By the action of heat on the coated material for a short period, the wax coating containing triethanolamine melted onto the surface of the diazotype material and there, because of its basic property, it initiated a coupling action in the unexposed areas (image areas) with the formation of a dye.
- a method of developing exposed diazotype sheet material comprising:
- infrared radiation-absorbing, heat-generating material uniformly disposed at a surface of said support, and a thermally-activatable alkali-generator uniformly disposed in intimate physical contact with said radiation-absorbing material at said support surface;
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
Description
United States Patent 4 Claims. in. 96-49) The present invention relates to reproduction processes and refers more particularly to a process and material for the development of diazotype copies.
In the diazotype process, the photosensitive copying material containing a diazo compound and a compound capable of coupling with the diazo compound is developed by the action of alkaline-reacting substances.
In an alkaline medium, an azo dye forms in the areas not alfected by light, thereby making the image visible. Gaseous ammonia is Widely used as the alkaline developer in practice today. However, it would be desirable to avoid the use of ammonia or other gaseous substances which must always be present in excess to insure thorough development, since special devices are required to prevent escape of gas from the developing equipment.
Liquid alkaline developer solutions have also been used. By using these, the disadvantages of development wtih gas are substantially avoided, but the resulting copies are obtained in moist form which in many cases is undesirable (for example, when making many copies in ofiices).
Basic-reacting substances which are liberated by heat and which then act as developers have also been coated with the essential diazo chemicals. Thus urea which forms ammonia has been used. Diazo materials contain ing such substances have the following disadvantages: relatively poor storability and stability, and for development, high temperatures and prolonged developing times requiring lengthy warm-up period even in insulated equipment.
It has now been found that the dry development of diazotype materials having excellent shelf life by the brief action of heat to produce good, high contrast copies is possible. The process is characterized by allowing infrared radiation to act briefly on a developer sheet comprising a support, infrared-absorbing matter, and at least one alkaline-reacting substance in free or combined form. Under the action of the heat generated by the infrared radiation and the master, this alkaline-reacting substance which is disposed in surface contact with the imagewiseexposed diazotype material changes its aggregation to one of gas, vapor, or liquid. As a result, the alkaline-reacting substance is transferred to the surface of the diazotype material and creates the proper alkaline environment necessary for development.
Therefore, one object of the present inevntion is to provide a process and material for the dry development of diazotype material, which overcomes the disadvantages of the prior art.
Another object is to provide a process and material for the quick, dry development of diazotype materials having excellent shelf life.
Other objects Will become apparent in the course of the following specification.
The alkaline-reacting substance and the infrared absorbing matter may be on the surface of or inside the support. Suit-able supports are paper, plastic foils, metal foils, and the like.
The paper may contain the infrared-absorbing matter such as carbon black and the alkaline reacting substance uniformly dispersed in finely-divided form over the whole of the paper. Such a developer sheet may be obtained 3,318,599 Patented May 9, 1967 ice by impregnation of commercial porous paper loaded with carbon black with suitable solutions of the alkaline-reacting substances. Non-porous paper or papers whose pores are closed by an impermeable coating may contain the alkaline-reacting substances in the form of a thin surface layer. Finally, the papers may have both the alkaline-reacting substance and the infrared-absorbing matter applied to one or both surfaces of the paper support.
The same arrangements may exist also when plastic films of polyethylene, polypropylene, cellulose acetate, and the like are used. Thus, both the alkaline-reacting substance and the infrared-absorbing matter may be added to the plastics during casting, in the melt, or during extrusion, and the resulting developer sheet contains these substances in a homogeneous distribution. However, this possibility may only \be utilized when the melt or the extrusion temperature of the plastics is below that at which the alkaline-reacting substance becomes active as developer with a change in its state of aggregation. The plastic films may contain carbon black homogeneously distributed within the support and the alkaline-reacting substance on their surface. However, the infrared-absorbing matter may also be applied together with the alkaline-reacting substance to the plastic support surface which expediently faces the diazotype coating.
In the case of metal supports, the infrared-absorbing matter may be applied to the surface facing the source of radiation, and the alkaline-reacting substance may be applied to the surface facing the diazotype coating. Both substances may also be present together on the surface in contact with the diazotype material. Liquid alkaline substances With which the support may be impregnated transfer themselves to the diazotype material by distillation. Solid alkaline-reacting substances are converted into the molten state and then transferred to the diazotype material. Moreover, solid alkaline-reacting substances may also be vaporized onto the diazotype material by sublimation. A particularly advantageous embodiment of the process is one in which the alkaline-reacting substance is initially not in free form but in physically or chemically combined form, is liberated by the action of heat, and transfers itself onto the diazotype material as gas, vapor, or in the form of a melt. Coatings which contain the alkaline-reacting substance in such combined form are distinguished by a particularly high stability and long shelf life.
Alkaline-reacting substances which may be used in free form are aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic amines which are sublimable, distillable or fusible at the temperatures generated by the infrared radiation. They may be of primary, secondary, or tertiary nature. Diamines and polyamines may also be used. The hydrocarbon radicals of the amines may contain functional groups, provided these do not have a deleterious efiect on the production of photocopies. Thus, hydroxy alkylamines or alkoxy alkylamines may be used. Aromatic amines may also contain hydroxy, ether, thioether, ester, keto or nitro groups on the nucleus, or fluorine, chlorine, or bromine atoms. Amines or substituted amines which have an injurious effect on the human system are not used. Nor are amines with very high carbon numbers generally used because at the preferred temperatures in the present process (50 C. to 200 (3.), they are undistillable, unsublimable, or infusible, or only very difiiculty so. Amines with not more than 30 carbon atoms are therefore generally preferred.
Some of the suitable amines are: alkylamines such as N-dodecylamine, oleylamine, and stearylamine; lower alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, l-aminopropanol-3, and triisopropanolamine; lower alkylene diamines such as ethylene diamine and 1,6-diaminohexane; araliphatic amines,
amines such as benzylamine; and aromatic amines such as aniline, o-toluidine, rn-toluidine, p-toluidine and alphanaphthylamine. Polyalkylene-polyamines may also be used.
Suitable substances which produce a liquid or volatile alkaline-reacting substance are urotropine, urea, thiourea, methylurea, ethylurea, methylthiourea, guanidine, and the ammonium salts of monobasic or polybasic inorganic or organic acids, especially carboxylic acids. Examples are ammonium carbonate, ammonium formate, ammonium acetate, ammonium succinate, ammonium lactate, ammonium citrate, ammonium tartrate, ammonium phthalate, and ammonium benzoate. Naturally, ammonium salts in which the liberated acid by-product has a deleterious effect on the production of photocopies are not used. Finally, the ammonia or alkaline-reacting substances may also be used in the form of complex, inclusion, or absorption compounds which liberate the base at the temperature used.
It is also possible to use mixtures of several alkalinereacting substances. Sublimable, distillable, and fusible basic substances may be mixed with substances which do not form a base until they are heated together.
Substances capable of wholly or substantially absorbing infrared rays for the present invention are varieties of carbon such as carbon black, animal charcoal and graphite.
In order to coat these supports, the alkaline-reacting substances are applied from aqueous or organic solutions to a support capable of absorbing infrared rays. In order to improve the adhesion of the substances to the support and to increase the shelf life of the material, binding agents may be added to the solution. Such agents may be polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl acetate, after-chlorinated polyvinyl chloride, polystyrene, polyamides, or polyesters. A suitable developing sheet may also be obtained by coating the support with a melt or by extrusion of a mixture of the alkaline-reacting substances with waxes or thermoplastics. During the subsequent developing process, the waxes together with the alkaline-reacting substance transfer themselves to the diazotype material. The impregnation of the support is likewise effected with the aid of suitable aqueous or organic solutions of the alkaline-reacting substances.
All known infrared radiators may be used as sources of radiation. The temperatures which these radiators produce in the absorption coating are expediently between 50 C. and 200 C. Especially preferred are temperatures between 100 C. and 150 C. The active period of radiation on the developer sheet consisting of support, the infrared-absorbing matter, and the alkaline-reacting substance is several seconds and is generally not greater than ten seconds.
The developer sheet is preferably disposed between the diazotype material and the source of radiation, but this is not absolutely necessary. The infrared radiation may :also be directed from the side of the diazotype material. This applies to a metal support bearing the alkaline-reacting substance on the surface facing the diazotype material.
One expedient embodiment of the process consists in covering the exposed diazotype material of a specific size with the developer sheet of the same size, and passing the two-ply assembly at a speed of several meters per minute through the radiation field of an infrared radiator while the diazotype material and the developer sheet are in close contact with each other. The radiator may be focused.
To avoid the positioning of individual developer sheets on the diazotype material to be developed, it is expedient to use the developer sheet as an endless strip over two or more rollers. The developing process then takes place in the space between two rollers. An ordinary commercial radiator fitted with a contact switch and designed to radiate only during the period necessary for actual development may be used,
The following examples further illustrate the invention and are not intended to limit the scope of the invention.
Example 1 A tissue paper permeated with carbon black at a coating weight of 30 grams per square meter was impregnated with a ten percent aqueous solution of ammonium carbonate. After drying, one sheet of the impregnated material was laid on an exposed ordinary commercial photocopying diazotype paper. The two papers were then passed at a rate of several meters per minute through the focal line of a focused infrared radiator with an output of 1,350 watts. Care was taken by means of rollers to insure good contact between the two papers. The infrared radiation was absorbed by the carbon black to generate heat of about 120 C. As a result, the ammonium carbonate decomposed into ammonia and carbon dioxide. The liberated ammonia permeated to the surface of the photocopying material where coupling took place in the unexposed areas due to the alkaline reaction of the ammonia, and the desired visible image was obtained.
Example 2 A solution of ten grams of urotropine, one gram of triisopropanolamine, and two grams of polyvinyl acetate in cc. of chloroform was applied to a carbon tissue paper loaded with carbon black. After evaporation of the chloroform, a firmly adhering coating with good shelf life was obtained on the support material. Coating was used for the development of diazotype copies with the action of heat, as described in Example 1.
Example 3 Fifty grams of an ester wax with a melting point of 7882 C. were melted into 20 grams of triethanolamine. The melt was applied by mechanical means to a wax paper base impregnated with carbon black and having a coating weight of 30 grams per square meter. The same procedure was followed as in Example 1. By the action of heat on the coated material for a short period, the wax coating containing triethanolamine melted onto the surface of the diazotype material and there, because of its basic property, it initiated a coupling action in the unexposed areas (image areas) with the formation of a dye.
It is apparent that the described examples are capable of many variations and modifications. All such variations and modifications are to be included within the scope of the present invention.
What is claimed is:
1. A method of developing exposed diazotype sheet material comprising:
(a) providing a developer sheet comprising a support,
infrared radiation-absorbing, heat-generating material uniformly disposed at a surface of said support, and a thermally-activatable alkali-generator uniformly disposed in intimate physical contact with said radiation-absorbing material at said support surface;
(b) combining said support surface in intimate contact with the sensitized surface of said diazotype sheet material; and
(c) exposing said radiation-absorbing material to infrared radiation for a time sufficient to generate therein temperatures effective to activate said alkali generator.
2. The method according to claim 1 wherein said radiation-absorbing material is carbon black.
3. A method in accordance with claim 1 in which the temperature of the developer sheet is raised to between 50 C. and 200 C. as a result of infrared radiation.
4. A method in accordance with claim 1 in which the developer sheet is between the source of infrared radiation and the diazotype material.
(References on following page) References Cited by the Examiner 3,503,797 1;;192; M11112- 96-49 5 33 233 9M9 312341323 12/1365 21 3153352; ;i.-:::::: 32:23 12/1956 Marron et 9649 5 NORMAN G. TORCHIN, Primary Examiner.
Z1132? 11112 2525 .jjijijjjjf afi ALEXANDER 11 R1601, 11/1964 Kosar 96-49 C. L. BOWERS,JR., AssistantExaminer.
8/1965 Hollmann 9649
Claims (1)
1. A METHOD OF DEVELOPING EXPOSED DIAZOTYPE SHEET MATERIAL COMPRISING: (A) PROVIDING A DEVELOPER SHEET COMPRISING A SUPPORT, INFRARED RADIATION-ABSORBING, HEAT-GENERATING MATERIAL UNIFORMLY DISPOSED AT A SURFACE OF SAID SUPPORT, AND A THERMALLY-ACTIVATABLE ALKALI-GENERATOR UNIFORMLY DISPOSED IN INTIMATE PHYSICAL CONTACT WITH SAID RADIATION-ABSORBING MATERIAL T SAID SUPPORT SURFACE; (B) COMBINING SAID SUPPORT SURFACE IN INTIMATE CONTACT WITH THE SENSITIZED SURFACE OF SAID DIAZOTYPE SHEET MATERIAL; AND (C) EXPOSING SAID RADIATION-ABSORBING MATERIAL TO INFRARED RADIATION FOR A TIME SUFFICIENT TO GENERATE THEREIN TEMPEATURES EFFECTIVE TO ACTIVATE SAID ALKALI GENERATOR.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEK0051075 | 1963-10-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3318699A true US3318699A (en) | 1967-05-09 |
Family
ID=7225859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US402946A Expired - Lifetime US3318699A (en) | 1963-10-12 | 1964-10-09 | Process and material for the development of diazotype copies |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3318699A (en) |
| AT (1) | AT262058B (en) |
| CH (1) | CH433976A (en) |
| GB (1) | GB1055414A (en) |
| NL (1) | NL6411489A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3446620A (en) * | 1965-03-18 | 1969-05-27 | Addressograph Multigraph | Process for developing diazotype materials |
| US3525619A (en) * | 1965-09-10 | 1970-08-25 | Keuffel & Esser Co | Heat-developable diazotype material |
| US3620741A (en) * | 1968-01-09 | 1971-11-16 | Agfa Gevaert Nv | Diazo-type copying |
| US3918974A (en) * | 1970-05-01 | 1975-11-11 | Mita Industrial Co Ltd | Process for the diazo-type multicolor reproduction |
| US4090879A (en) * | 1976-11-15 | 1978-05-23 | Gaf Corporation | Developing solutions for 2-component diazo-type materials |
| US4452876A (en) * | 1979-11-28 | 1984-06-05 | Andre Schaeffer | Steam, water or heat developing diazotype material |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2691587A (en) * | 1949-07-20 | 1954-10-12 | Rca Corp | Developing of diazotype images |
| US2774669A (en) * | 1953-04-13 | 1956-12-18 | Dick Co Ab | Diazotype reproduction process |
| US2844733A (en) * | 1956-04-02 | 1958-07-22 | Minnesota Mining & Mfg | Reflex thermoprinting |
| US3089953A (en) * | 1959-04-15 | 1963-05-14 | Kalle Ag | Reproduction process |
| US3157503A (en) * | 1963-03-19 | 1964-11-17 | Keuffel & Esser Co | Diazotype reproduction materials |
| US3202510A (en) * | 1961-07-11 | 1965-08-24 | Frederick Post Co | Production of encapsulated light-sensitive diazotype compositions and coatings |
| US3203797A (en) * | 1962-10-16 | 1965-08-31 | Andrews Paper & Chem Co Inc | Thermal diazotype method and developer sheet for use therein |
| US3224354A (en) * | 1960-07-07 | 1965-12-21 | Dietzgen Co Eugene | Apparatus for making copies on ray sensitive sheets upon exposure to ultraviolet and infrared radiation |
| US3224878A (en) * | 1961-12-01 | 1965-12-21 | Dietzgen Co Eugene | Thermographic diazotype reproduction material, method of making and method of using |
-
1964
- 1964-10-02 NL NL6411489A patent/NL6411489A/xx unknown
- 1964-10-09 GB GB41333/64D patent/GB1055414A/en not_active Expired
- 1964-10-09 AT AT863164A patent/AT262058B/en active
- 1964-10-09 CH CH1311764A patent/CH433976A/en unknown
- 1964-10-09 US US402946A patent/US3318699A/en not_active Expired - Lifetime
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2691587A (en) * | 1949-07-20 | 1954-10-12 | Rca Corp | Developing of diazotype images |
| US2774669A (en) * | 1953-04-13 | 1956-12-18 | Dick Co Ab | Diazotype reproduction process |
| US2844733A (en) * | 1956-04-02 | 1958-07-22 | Minnesota Mining & Mfg | Reflex thermoprinting |
| US3089953A (en) * | 1959-04-15 | 1963-05-14 | Kalle Ag | Reproduction process |
| US3224354A (en) * | 1960-07-07 | 1965-12-21 | Dietzgen Co Eugene | Apparatus for making copies on ray sensitive sheets upon exposure to ultraviolet and infrared radiation |
| US3202510A (en) * | 1961-07-11 | 1965-08-24 | Frederick Post Co | Production of encapsulated light-sensitive diazotype compositions and coatings |
| US3224878A (en) * | 1961-12-01 | 1965-12-21 | Dietzgen Co Eugene | Thermographic diazotype reproduction material, method of making and method of using |
| US3203797A (en) * | 1962-10-16 | 1965-08-31 | Andrews Paper & Chem Co Inc | Thermal diazotype method and developer sheet for use therein |
| US3157503A (en) * | 1963-03-19 | 1964-11-17 | Keuffel & Esser Co | Diazotype reproduction materials |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3446620A (en) * | 1965-03-18 | 1969-05-27 | Addressograph Multigraph | Process for developing diazotype materials |
| US3525619A (en) * | 1965-09-10 | 1970-08-25 | Keuffel & Esser Co | Heat-developable diazotype material |
| US3620741A (en) * | 1968-01-09 | 1971-11-16 | Agfa Gevaert Nv | Diazo-type copying |
| US3918974A (en) * | 1970-05-01 | 1975-11-11 | Mita Industrial Co Ltd | Process for the diazo-type multicolor reproduction |
| US4090879A (en) * | 1976-11-15 | 1978-05-23 | Gaf Corporation | Developing solutions for 2-component diazo-type materials |
| US4452876A (en) * | 1979-11-28 | 1984-06-05 | Andre Schaeffer | Steam, water or heat developing diazotype material |
Also Published As
| Publication number | Publication date |
|---|---|
| AT262058B (en) | 1968-05-27 |
| NL6411489A (en) | 1965-04-13 |
| CH433976A (en) | 1967-04-15 |
| GB1055414A (en) | 1967-01-18 |
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