US3196029A - Heat-copying process - Google Patents

Heat-copying process Download PDF

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Publication number
US3196029A
US3196029A US146323A US14632361A US3196029A US 3196029 A US3196029 A US 3196029A US 146323 A US146323 A US 146323A US 14632361 A US14632361 A US 14632361A US 3196029 A US3196029 A US 3196029A
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resin
heat
master
coating
image
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US146323A
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English (en)
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Lind Erwin
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KALLE AKTIENGESELSLCHAFT
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KALLE AKTIENGESELSLCHAFT
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/398—Processes based on the production of stickiness patterns using powders

Definitions

  • the present invention relates to a heat-copying process in which a layer of a hat-sensitive natural, modified natural or synthetic resin is exposed to a heat image and then developed by treatment with a developer.
  • the developed image may be fixed if desired.
  • Copies have been prepared by the image-wise action of heat on a material which, when heated, becomes discolored as a result of chemical reaction. Copies hitherto obtained in this way have the disadvantage that they discolor completely when unintentionally heated and thus become unusable. Moreover, they are not permanent when exposed to light, hence, such copies are unsuitable for use as documents. ln another known heat-copying process, a colored Wax is transferred by image-wise heat action to a copy support. The copies obtained by this process, however, lack adequate definition.
  • the present invention provides a heat copying process which comprises effecting image-wise exposure to radiant heat of a surface Vconsisting of a heat-sensitive natural or synthetic resin, or a heat-sensitive modified natural resin, and thereafter developing the latent heat image formed on the surface, to render it visible, by treatment with a colorless or colored powder, followed by xing of the developed image, where necessary.
  • FGURE 2 shows an arrangement of a master and a heat-sensitive resin layer as employed in the reflex copying process
  • FIGURES 3 and 4 show a powder image formed on the heat-sensitive resin layer after removing the master and contacting the heat-sensitive resin layer with powder.
  • the synthetic resins suitable for use in the process according to the invention normally have a softening temperature between 40 an-d 180 C., but, in some special cases, synthetic resins having a softening temperature below or above these limits are suitable.
  • the syntheic resin may be a polyamide, eg. a polymer of an w-aminocarboxylic acid or a lactam thereof or condensatioa product or mixed condensation product of a diamine and a dicarboxylic acid. Very favorable results are obtained with polycaprolactam and with a condensation product of adipic acid and hexamethylene diamine. Polyamides containing substituents, particularly allroxymethyl groups, attached to the carbonamide nitrogen atoms are particularly suitable. The substituent alkoxymethyl groups may be introduced into the polyamides by heating a solution of the polyamide in formic acid or acetic acid with formaldehyde and the appropriate alcohol, eg. methanol, ethanol or propanol.
  • a polyamide eg. a polymer of an w-aminocarboxylic acid or a lactam thereof or condensatioa product or mixed condensation product of a diamine and a dicarboxylic acid. Very favorable results are obtained with
  • polyamides are obtained in which 3,196,629 Patented July 20, 1%65 ICC the hydrogen atoms on the carbonamide nitrogen atoms are replaced by alkoxymethyl groups to varying degrees.
  • polyamides which are fairly highly substituted. Those in which about 30 to 60% of the hydrogen atoms on the carbonamide nitrogen atoms are replaced by alkoxymethyl groups are particularly suitable. Polyamides with greater or lesser substitution can be used, but with polyamides with less substitution the time required for exposure increases.
  • the synthetic resin may be another thermoplastic resin, e.g. a polyvinyl compound such as polyvinyl chloride, chlorinated polyvinyl chloride, polyvinyl acetate, polystyrene and modified polystyrene, a polyole'fin, preferably polyethylene or polypropylene, an interpolymer or polymer mixture derived from these substances, a polyester, e.g. polyterephthalic acid ester or an interpolymer of terephthalic acid and isophthalic acid with ethylene glycol, a polyacrylic compound such as polyacrylic acid ester or a polyhalogenated hydrocarbon, such as a diphenyl chloride resin.
  • the resin has a softening point (Krmer-Sarnow-Nagel) of 6ft-70 C., a color number of 1 2 and an acid number of 0'.
  • Natural resins suitable for the process according to the invention are, primarily, shellac and colophony. Very favorable results are also obtained with modified natural resins, i.e conversion or refinement products, e.g. hydrogenated resins such as dihydroand tetra-hydroabietic acid, zinc resins, e.g. the product commercially available as Erkazit-Hartharz (melting point: 15S-130 C.) and polymerized resins, e.g. the product commercially available as Polypale Resin (melting point: 9S-106 C.).
  • modified natural resins i.e conversion or refinement products, e.g. hydrogenated resins such as dihydroand tetra-hydroabietic acid, zinc resins, e.g. the product commercially available as Erkazit-Hartharz (melting point: 15S-130 C.) and polymerized resins, e.g. the product commercially available as Polypale Resin (melting point: 9S-106
  • the synthetic resin may also be a thermosetting resin, for example an ester resin such as a maleinate resin, c g. a modified maleic acid resin having a melting point of 60-70" C. and an acid number of 1Z0-130, or the product commercially available as Hobimal P (melting point: ISO-158 C.), a phenolic resin such as a novolak, e.g. the product commercially available as Alnovol 429K (melting point: 10S-118 C.), or a non-plasticized phenol resin of the resol type having a melting point Vof L15-58" C., a modified phenolic resin, e.g.
  • an ester resin such as a maleinate resin, c g. a modified maleic acid resin having a melting point of 60-70" C. and an acid number of 1Z0-130, or the product commercially available as Hobimal P (melting point: ISO-158 C.)
  • a phenolic resin such as a novol
  • a phenolic resin modified with colophony and having a melting point of 59-65 C. and an acid number of about 80 a phenolic resin modified with resin acid or resin acid esters, eg. the product commercially available as Albertol 3 69a (melting point: 1Z0-130 C.), a ketone resin, e.g. a ketone resin having a melting point of 76-82" C., a color number of 1-2.5, and a saponification number of 0, or a ketoneformaldehyde resin having a softening temperature of 11S-120 C. and an acid number of 0.
  • a ketone resin e.g. a ketone resin having a melting point of 76-82" C., a color number of 1-2.5, and a saponification number of 0, or a ketoneformaldehyde resin having a softening temperature of 11S-120 C. and an acid number of 0.
  • the compounds specified can be used in the form of self-supporting foils or in the form of a thin coating applied to one or to both sides of a support.
  • a wide range of materials can be used for the support, which is preferably in the form of a flat sheet or foil. Paper, cellulose hydrate, plastic or metal foils, for example, are very suitable. Rigid supports made of glass or pottery are, however, also suitable.
  • the copying material is exposed to radiant heat.
  • This can be done by the contact method, .as illustrated in FIGURE l of the drawings, when the master has text on one side only, in which case the infra-red radiation from a radiant heat source 4 pass through the master l, having the printed matter 2 thereon, to the heat-sensitive resin layer 3 in which the heated areas 6l are formed or by the reflex method in the case of a master having text on both sides, as shown in FIGURE 2 of the accompanying drawings, in which case infra-red radiation 5 from the radiant source 4 passes through the copying material, i.e., the heat-sensitive resin layer 3a which is placed between the radiant .source 4 and a master lla for reflex copying, which has the printed matter 2 thereon, with the result that the "heated areas 6 are formed in the heat-sensitive resin layer 3a.
  • FIGURES 3 and 4 show the powdered image areas 7 formed on the heat-sensitive resin layer 3 used in the contact copying process and on the resin layer 3a used in the reex copying process after removing the master in each case and'contacting the heat-sensitive resin layers with developer powder.
  • the master and the c-opying material shouldv be in the closest possible contact and the exposure to heat should be as brief and intensive as possible.
  • the thickness of the resin coating applied to the support is generally between about l and 50p, preferably between about 3 and 10u.
  • Commercially available infra-red radiators e.g. of from 1000 to 2000V watts, or an infra-red flash may be used as the source of heat.
  • the process can be performed in a machine in which the copying material passes, in close contact with the original, over rollers at a speed of several meters a minute through the focal point of a focused 1350-watt infra-red radiator.
  • the resin-coated side of the copying material is covered with a cellulose acetate lm having a thin silver coating, e.g. an exposed, developed and fixed photographic film, which is placed with the silver coating in contact with the heat-sensitive coating of the copying material, and the infra-red radiation is passed through the master and the cellulose acetate iilm.
  • the heat produced by the absorption of the infra-red rays in the master is prevented by the cellulose acetate film from passing to the heat-sensitive coating of the-copying material.
  • radiation which passes through the negative master is however absorbed by the silver coating.
  • a positive latent image is formed on the heat-sensitive coatlng.
  • Fine powders of vari-ous types are suitable for the development of the latent image and these Vpowders also may be colored; examples are powdered inorganic and organic dyestuis, metal powders, glass powders and synthetic resin powders, of a particle size in the range of 0.1V to 100g, preferably 1 to 20M.
  • the powders are used either alone or on a carrier.
  • Suitable carriers are brushes of various types, rollers, particularly rollers tted with bristles or having a plush covering and also line glass or synthetic plastic balls having a particle size of a few hundred microns, or metal filings.
  • the latent image is contacted for a short time with one of these powders, using a carrier if desired.
  • the iine powder adheres to the image-bearing parts of the heatsensitive coating to form a visible imagel corresponding to The infra-redV the master.
  • the visible image has sufficient resistance to smearing, but such resistance can be improved by fixing.
  • Fixing can be effected by heating or by exposing the image to solvent vapor.
  • a coating of lacquer or a transparent foil can be applied to the image.
  • Example I A solution in 100 parts by volume of methanol of 7.5 parts by weight of methoxymethylated polyhexarnethylene diamine adipate, in which about 40% of the carbonamide hydrogen .atoms have been replaced by methoxymethyl groups, is mechanically coated upon paper, weighing grams/square meter, which has been'precoated to prevent penetration by organic solvents. The coating is dried with hot air at a temperature of to 100 C. An image is. produced on the dried coating in the following manner: the copying material is placed under a master and passed in close contact with the master by rollers at a speed of l0 meters a minute through the focal point of a focused l350-watt infra-red radiator.
  • the developer consists of parts by Weight of glass balls of a particle size of 350-400p. and 2 parts by weight of .a colored resin powder of a particle size of 20-50g, made by melting together 30 parts by Weight of polystyrene, 30 parts by weight of a maleinate resin and 3 parts by weight of carbon black, the melt being afterwards ground and screened.
  • Example Il A waxed paper weighing 40 grams/square meter is mechanically coated on both sides with a solution in 100 parts by volume of 80% ethanol of 7,15 parts by weight of a methoxymethylated polycaprolactam, in which about 30% of lthe carbonamide hydrogen atoms have been replaced by methoxymethyl groups. The thickness of each coating is about 5h. The coatings are dried with hot air. To prepare a copy from a master with text Ion both sides, the copying material is placed against the side of the master which is to be ⁇ copied and the master is exposed (through the copying material) to infra-red radiation as described in Example I. A non-reversed latent image corresponding to the master is formed on the side of the copying material remote from the master.
  • This image is rendered visible by treatment with a colored resin powder as described in Example I. lf a high degree of resistance to smearing is required ⁇ in the copy, the colored image can be fixed by a brief intensive further exposure to radiant heat. A copy suitable for use as a document is obtained. The copy has good contrast and can be used as an intermediate for further copying, for example by the diazotype process.
  • Example III A 7.5% solution in methanol of a methoxyrnethylated polycapr-olactam, yin which about 30% of the carbonamide hydrogen atoms have been replaced by methoxymethyl groups, is coated upon paper weighing 80 grams/ square meter which has been precoated to prevent penetration by organic solvents, the thickness of the coating being about 10p.. The coating is dried with hot air and an exposed, developed and fixed photographic lm is then placed, silver-side down, on the coating. A negative master ⁇ to be copied is then placed on top of the ilm and exposure to infra-red radiation is eected, as described in Example I, with the negative master facing the radiation source. Development of the latent image is performed in the manner described in Example I with a developer consisting of a pigmented resin powder and line glass balls. A clearly legible image, which Iis nega- .tive in relation to the master, is obtained.
  • a mixed condensation product from adipic acid and hexamethylene diamine, adipic acid and 4,4- d-iamino-diphenylmethane and caprolactam, condensed in the proportions 1:111, can be used with equal success.
  • Example V A solution of l5 parts 'by weight of a chlorinated polyvinyl chloride 4in l5() parts by volume of toluene and 50 parts by volume of butanol is mechanically coated upon paper Weighing 80 grams/square meter, which has been precoated to prevent penetration by organic solvents. After the coating has dried, it has a thickness of about 10p.
  • the copying material is place-d on top of a typeW-ritten master and passed at a speed of a few meters a minute in front of an infra-red radiatior, close contact being maintained between the copying material and the master.
  • a latent image corresponding to the master is produced on the heat-sensitive coating.
  • This image is made visible by treatment with the developer described in Example I.
  • the resistance to smearing of the visible developed image is increased by xing it by a brief further exposure to radiant heat.
  • Example Vl Results which are the equivalent or" those obtained in Example V are obtained by the use of a heat-sensitive coating formed by dissolving 36 parts by weight of polystyrene and 7 parts by weight of tricresyl phosphate in 420 parts by volume of chlorobenzene Iand 180 parts by volume of toluene and applying this solution to the paper described in Example V.
  • the heat-copying process is accomplished as described in Example V.
  • Example VII Paper as described in Example V is mechanically coated with .a solution of l parts by weight of a polyacrylic acid ester in l0() parts by volume of 1toluene to produce, after drying, a coating of thickness about -10u.
  • the coating is given a brief exposure to intensive infra-red radiation through a master which is in intimate contact with the coating.
  • the latent image is rendered visible as described in Example V.
  • Example VIII instead of the polyacrylic acid ester used lin Example VII, a .polyester is used. This polyester is produced by esterication of a mixture of 60% terepllthalic acid and 40% of isophthalic acid with ethylene glycol. Otherwise the procedure is as in Example VI. The resultant copy has excellent contours.
  • Example IX l5 parts by weight of shellac are dissolved in 100 parts by volume of methanol and the solution is coated upon paper Weighing 110 grams/square meter which has been given a precoat to prevent penetration by organic solvents.
  • the coating is exposed and the image developed as described in Example V.
  • a coating produced by the application and drying of a solution of 25 parts by weight of colophony in 100 parts by volume of toluene can be used with equal success.
  • Example X Example XI Paper Weighing 60 grams/ square meter, which has been provided by extrusion with a coating of polyethylene of a thickness of about 15p., is passed together with a transparent film master at a speed of several meters a minute through the focal point of a focused BSO-watt infra-red radiator, the master being maintained in intimate Contact with the polyethylene coating.
  • the latent image is developed as described in Example I and fixed by a brief further exposure to heat.
  • Example XII yPaper weighing grams/square meter that has been precoated to protect it against penetration by organic solvents is mechanically coated with a solution of 25 parts by weight of ⁇ a ketone-formaldehyde resin, having a softening temperature of l15l20 C. and an acid number of O, in parts by volume of toluene. After drying, the coating has a thickness of about 5-l0,u.
  • This coating in intimate contact with a positive lm master, is exposed to brief intensive infra-red radiation. For this purpose, it is passed at a speed of a few meters a minu'te through the focal point of a focused 1350-Watt infra-red radiator. Close contact between the master and the copying material is ensured by two pressure rolls.
  • the latent image is developed and fixed as described in Example I.
  • the finished copy is subjected to a brief further exposure to heat. It can, for example, be passed through the apparatus in which the latent image was produced. With equal success, a solution of a formaldehyde-ketone resin, having a softening temperature of 76-82 C., can be used for the preparation of the heat-sensitive coating.
  • Example XIII A solution of 25 parts by weight of a maleinate resin, having a softening temperature of 15G-158 C. and an acid number of 20, in 100 parts by volume of toluene is mechanically coa-ted upon paper which has been pretreated to render it resistant to solvents.
  • the resultant maleinate resin coating the thickness of which is about 10p, is exposed, under a thin master, e.g. a typewritten air mail letter, to infra-red radiation in the manner described in Example XII.
  • the latent image is developed as described in Example I. An easily legible high-contrast image corresponding to the master is obtained.
  • maleinate resins may be used having a softening temperature of 119 to 126 C. and an acid number of 10 to L1 or a softening temperature of 60 to 70 C. and an acid number of 120-130.
  • Example XIV 25 parts by Weight of a phenol-formaldehyde resin, having a softening temperature of 10S-118 C. and an acid-number of O, are dissolved in 100 parts by volume of butanone and the solution is coated upon a paper foil which has'been precoated to protect it from penetration by organic solvents. Exposure, development and xing are accomplished as described in Example X11.
  • a phenolic resin of the non-plasticized resol type can be used, eg. a product having a softening temperature of 45 to 58 C., the coating solution consisting of 15 parts by weight of this Vresin dissolved in 100 parts by volume of ethyl acetate.
  • a phenolic resin modified with colophony, :and having a softening temperature of Y1Z0-130" C. and an acid number of underr20, may be used with equal success.
  • a copying process which comprises:
  • Aprocess according to claim 6 in which the resin l is a condensation product of a diamineand a dicarboxylic acid.
  • the resin is a polyamide containing alkoxyrnethyl substituents on some of the carbonamide nitrogenratoms.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Printing Methods (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
US146323A 1960-12-10 1961-10-19 Heat-copying process Expired - Lifetime US3196029A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DEK42365A DE1125453B (de) 1960-12-10 1960-12-10 Waermekopierverfahren
DEK42512A DE1166795B (de) 1960-12-10 1960-12-27 Waermekopierverfahren
DEK42581A DE1140953B (de) 1960-12-10 1961-01-07 Waermekopierverfahren
DEK43334A DE1179566B (de) 1960-12-10 1961-03-29 Waermekopierverfahren

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US3196029A true US3196029A (en) 1965-07-20

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US (1) US3196029A (zh)
AT (1) AT247379B (zh)
BE (1) BE611269A (zh)
CH (1) CH408073A (zh)
DE (4) DE1125453B (zh)
DK (1) DK103302C (zh)
GB (1) GB988869A (zh)
LU (1) LU40874A1 (zh)
NL (1) NL272284A (zh)
SE (1) SE312976B (zh)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3329500A (en) * 1965-06-07 1967-07-04 Xerox Corp Electrostatic frosting
US3364858A (en) * 1963-09-20 1968-01-23 Konishiroku Photo Ind Method for the preparation of an offset printing master
US3383505A (en) * 1964-03-12 1968-05-14 Nasu Kintaro Process for copying utilizing heat-sensitive copying materials containing water of crystallization that can be released by heating
US3396401A (en) * 1966-10-20 1968-08-06 Kenneth K. Nonomura Apparatus and method for the marking of intelligence on a record medium
US3404994A (en) * 1965-02-11 1968-10-08 Arnold G. Gulko Thermographic copying process utilizing recording member with dispersed oil particles
US3409455A (en) * 1965-01-04 1968-11-05 Gaf Corp Process of reproduction on benzene diazonium fluoborate sheet by heat exposure
US3428952A (en) * 1964-10-02 1969-02-18 Keuffel & Esser Co Method of thermally recording,and electrically retrieving information
US3431412A (en) * 1965-01-08 1969-03-04 Kenichi Nagai Infrared copying process and copying material which releases water of crystallization
US3446617A (en) * 1962-04-20 1969-05-27 Minnesota Mining & Mfg Thermographic copying process
US3510336A (en) * 1965-08-12 1970-05-05 Gaf Great Britain Ltd Reflex copying method
US3515570A (en) * 1965-12-20 1970-06-02 Matsushita Electric Ind Co Ltd Heat-sensitive sheet and method of thermographic reproduction using the same
US3537872A (en) * 1963-02-26 1970-11-03 Hisako Kishida Thermographic process
US3539342A (en) * 1965-02-10 1970-11-10 Toshihiko Nagai Reproduction process
US3557691A (en) * 1968-06-25 1971-01-26 Owens Illinois Inc Electrostatic stencil printing process utilizing polyester-alkyd resin powder
US3619345A (en) * 1968-06-28 1971-11-09 Ricoh Kk Heat-sensitive stencil paper

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3206601A (en) * 1963-05-21 1965-09-14 Keuffel & Esser Co Plastic film thermography
DE1546750C2 (de) * 1965-12-29 1973-11-08 Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka (Japan) Thermographisches Reproduktions verfahren

Citations (12)

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Publication number Priority date Publication date Assignee Title
US2297691A (en) * 1939-04-04 1942-10-06 Chester F Carlson Electrophotography
US2561513A (en) * 1948-10-20 1951-07-24 Celanese Corp Process for coating and coating compositions
US2616961A (en) * 1946-09-23 1952-11-04 Groak Josef Printing
US2847330A (en) * 1954-07-28 1958-08-12 Ohio Commw Eng Co Method and apparatus for gas plating printing circuits
US2855324A (en) * 1955-04-07 1958-10-07 van dorn
GB806677A (en) * 1955-12-29 1958-12-31 Bayer Ag Process for the production of protective coatings
US2909443A (en) * 1953-09-29 1959-10-20 Du Pont Process of making polyethylene film receptive to organic coating
US2974060A (en) * 1958-07-18 1961-03-07 Polymer Corp Fluidized bed coating method
US3060024A (en) * 1959-09-11 1962-10-23 Du Pont Photopolymerization process for reproducing images
US3081699A (en) * 1958-12-22 1963-03-19 Arnold G Gulko Thermal reproduction
US3089953A (en) * 1959-04-15 1963-05-14 Kalle Ag Reproduction process
US3094619A (en) * 1961-01-03 1963-06-18 Minnesota Mining & Mfg Ultra-violet radiation-desensitizable thermographic copy-sheet and method

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2297691A (en) * 1939-04-04 1942-10-06 Chester F Carlson Electrophotography
US2616961A (en) * 1946-09-23 1952-11-04 Groak Josef Printing
US2561513A (en) * 1948-10-20 1951-07-24 Celanese Corp Process for coating and coating compositions
US2909443A (en) * 1953-09-29 1959-10-20 Du Pont Process of making polyethylene film receptive to organic coating
US2847330A (en) * 1954-07-28 1958-08-12 Ohio Commw Eng Co Method and apparatus for gas plating printing circuits
US2855324A (en) * 1955-04-07 1958-10-07 van dorn
GB806677A (en) * 1955-12-29 1958-12-31 Bayer Ag Process for the production of protective coatings
US2974060A (en) * 1958-07-18 1961-03-07 Polymer Corp Fluidized bed coating method
US3081699A (en) * 1958-12-22 1963-03-19 Arnold G Gulko Thermal reproduction
US3089953A (en) * 1959-04-15 1963-05-14 Kalle Ag Reproduction process
US3060024A (en) * 1959-09-11 1962-10-23 Du Pont Photopolymerization process for reproducing images
US3094619A (en) * 1961-01-03 1963-06-18 Minnesota Mining & Mfg Ultra-violet radiation-desensitizable thermographic copy-sheet and method

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3446617A (en) * 1962-04-20 1969-05-27 Minnesota Mining & Mfg Thermographic copying process
US3537872A (en) * 1963-02-26 1970-11-03 Hisako Kishida Thermographic process
US3364858A (en) * 1963-09-20 1968-01-23 Konishiroku Photo Ind Method for the preparation of an offset printing master
US3383505A (en) * 1964-03-12 1968-05-14 Nasu Kintaro Process for copying utilizing heat-sensitive copying materials containing water of crystallization that can be released by heating
US3428952A (en) * 1964-10-02 1969-02-18 Keuffel & Esser Co Method of thermally recording,and electrically retrieving information
US3409455A (en) * 1965-01-04 1968-11-05 Gaf Corp Process of reproduction on benzene diazonium fluoborate sheet by heat exposure
US3431412A (en) * 1965-01-08 1969-03-04 Kenichi Nagai Infrared copying process and copying material which releases water of crystallization
US3539342A (en) * 1965-02-10 1970-11-10 Toshihiko Nagai Reproduction process
US3404994A (en) * 1965-02-11 1968-10-08 Arnold G. Gulko Thermographic copying process utilizing recording member with dispersed oil particles
US3329500A (en) * 1965-06-07 1967-07-04 Xerox Corp Electrostatic frosting
US3510336A (en) * 1965-08-12 1970-05-05 Gaf Great Britain Ltd Reflex copying method
US3515570A (en) * 1965-12-20 1970-06-02 Matsushita Electric Ind Co Ltd Heat-sensitive sheet and method of thermographic reproduction using the same
US3396401A (en) * 1966-10-20 1968-08-06 Kenneth K. Nonomura Apparatus and method for the marking of intelligence on a record medium
US3557691A (en) * 1968-06-25 1971-01-26 Owens Illinois Inc Electrostatic stencil printing process utilizing polyester-alkyd resin powder
US3619345A (en) * 1968-06-28 1971-11-09 Ricoh Kk Heat-sensitive stencil paper

Also Published As

Publication number Publication date
DE1179566B (de) 1964-10-15
SE312976B (zh) 1969-07-28
LU40874A1 (zh) 1962-01-27
GB988869A (en) 1965-04-14
DK103302C (da) 1965-12-13
AT247379B (de) 1966-06-10
NL272284A (zh)
BE611269A (zh)
DE1125453B (de) 1962-03-15
DE1166795B (de) 1964-04-02
CH408073A (de) 1966-02-28
DE1140953B (de) 1962-12-13

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