US3029157A - Magnetizable image transfer medium - Google Patents

Magnetizable image transfer medium Download PDF

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US3029157A
US3029157A US774581A US77458158A US3029157A US 3029157 A US3029157 A US 3029157A US 774581 A US774581 A US 774581A US 77458158 A US77458158 A US 77458158A US 3029157 A US3029157 A US 3029157A
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magnetizable
group
composition
percent
image transfer
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US774581A
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George M Sutheim
Harold J Southcomb
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Audio Devices Inc
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Audio Devices Inc
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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
    • B41M5/10—Duplicating or marking methods; Sheet materials for use therein by using carbon paper or the like
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/14—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates
    • H01F41/16—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates the magnetic material being applied in the form of particles, e.g. by serigraphy, to form thick magnetic films or precursors therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/914—Transfer or decalcomania

Definitions

  • This invention relates to magnetic coatings and, more particularly, to a coating composition adapted to form a magnetizable image transfer medium.
  • Physical image transfer media such as carbon paper, typewriter ribbons for single image transfer and duplicator stencils are commonly used to transfer a visual image from one medium to another.
  • Each of these transfer edia comprises a supporting base of paper or plastic foil carrying a coating of a pigmented or dyed wax-containing material.
  • the coating composition can be liquefied for application to the supporting base simply by melting the wax component of the composition, and after the composition solidifies it exhibits the characteristics of the wax, notably its softness, weak cohesive forces, freedom from tackiness and absence of cold flow, which make it particularly suitable for mechanical transfer of a visual image from one medium to another.
  • the strength of the magnetic response is directly proportional to the concentration of the magnetizable material in the composition. Accordingly, a relatively large percentage of magnetizable material must be incorporated in a magnetizable image transfer coating composition.
  • Hot-melt compounds such as the waxes used for the aforementioned visual image transfer coating composition lose their desirable characteristics when such relatively large proportions of a magnetizable pigment are added to the waxes.
  • Other conventional materials which are generally usefulin forming thin films, such as the resins and many plastics soluble at room temperature in technical solvents, are either too hard when dried or become tacky when softened by the addition of a plasticizer.
  • Greases on the other hand, are prone to cold flow even though the grease is relatively hard. The problem, then, is to produce a magnctizable image transfer coating composition which can be mechanically transferred from one medium to the other with the ease and clarity of detail characteristic of the visual image transfer coating compositions.
  • the composition of our invention consists essentially of (a) a grease-like material of the group consisting of soft mineral waxes, animal fats and vegetable fats, (b) a bodying agent of the group consisting of fatty acids having from 12 to 18 carbon atoms and the esters and metallic salts thereof, (c) a hydrophobic oil soluble normally-solid chain polymer, (d) an amount of a finely-divided magnetizable material at least equal to the total amount of the aforementioned materials, and (e) an organic solvent capable of solvating the normally-solid polymer and present in amount sufficient to impart a fluid consistency to the composition.
  • the composition can be readily applied to a sheet of magnetically inert material to form, after the solvent has been driven off, a magnetiz
  • FIGURE is a fragmentary cross-sectional view of a magnetisable image transfer medium embodying the invention.
  • the grease-like materials that form the base of our new composition comprise soft mineral waxes such as petro latum and microcrystalline petroleum waxes, as well as animal and vegetable fats such as lanolin and cacao butter. These materials, whether used singly or in combina tion with one another, are supplemented by other materials, herein referred to as bodying agents, which add body to the grease-like materials.
  • the bodying agents consist of fatty acids having from 12 to 18 carbon atoms and the esters and metallic salts thereof. Stearic acid, sorbitan monopalmitate, calcium stearate and barium stearate are representative examples of such bodying agents.
  • the bodied grease-like material is further reinforced by the addition of a minor proportion of a hydrophobic, oil-soluble, normally-solid chain-type polymer which is also soluble in a mutual solvent for the bodied greaselike material.
  • Chlorinated rubber, cellulose esters, cellulose ethers and similar polymer compounds are efiective for this purpose.
  • a plasticizer for the polymer may also be incorporated in the mixture. Dioctyl phthalate or dihexyl phthalate are particularly suitable, although other plasticizers such as dioctyl adipate or dioctyl sebacate are equally efiective.
  • the resulting mixture is solvated by any suitable solvent such as toluene.
  • solvent such as toluene.
  • the solvent may be added directly to the mixture of grease-like material, bodying agent and polymer reinforcing agent, we have found that dissolution of all components is facilitated if the polymer is first dissolved in a portion of the solvent and the resulting polymer solution is then added to the other solid components along with the balance of the solvent.
  • the resulting mixture forms the carrier vehicle for the magnetizable material.
  • the magnetizable material may comprise any of the finely-divided materials corn monly used as the magnetizable component of magnetic recording tapes and sheets, such, for example, as ferrosoferric oxide and gamma ferric oxide. Finely-divided metallic iron, iron alloys and magnetic ferrites are similarly useful.
  • the proportions of the aforementioned components of the composition of our invention are such that the amount of the bodying agent is at least one-half and preferably exceeds that of the grease-like material, that the amount of the polymer does not exceed and is generally less than the grease-like material, and that the amount of the solvent is suificient to impart flowability when these components are admixed with an amount of magnetizable material at least equal to the total amount of the nonvolatile components, to wit, the grease-like material, the bodying agent and the polymer.
  • the amount of the bodying agent varies between 50% and 300% by weight of the grease-like material
  • the amount of the polymer varies between 20% to by weight of the grease-like material
  • the amount of the solvent varies between 200% and 350% by weight of the total amount of the grease-like material, the bodying agent and the polymer
  • the amount of the magnetizable material ranges between 100% and 200% by weight of the aforesaid total of the grease-like material, the bodying agent and the polymer.
  • the resulting composition is then applied by any conventional coating technique, such as by a doctor blade, to a sheet of magnetically inert material such as webs of paper, cellulose acetate, polyvinyl chloride and acetate polymers and co-polymers thereof, and a polyester such as the condensation product of ethylene glycol and terephthalic acid.
  • a coating technique such as by a doctor blade
  • the coating is advantageously about 0.25 mil thick, although thinner and thicker coatings are useful.
  • the coated web is then cut into ribbons of any desired width by means of conventional slitting machinery.
  • Example I Component Identity Parts by Weight Grease-like material Anhydrous lano1in.
  • 15 Solvent Toluene 150 Magnetizable material Ferrosoferric oxide- 100
  • Example 11 Component Identity Parts by Weight Grease-like material Petzolatum 25 Bodying agent t Stearic acid 25 PolymeL Ethyl cellulose Solvent Toluene 150 Magnetizable material Ferrosoferric oxide- 100
  • Example 111 Component Identity Parts by Weight Grease-like material Anhydrous lanolin. 35 Bodying agent Sorbitan 25 monopalmltate.
  • a coating composition adapted when applied to a sheet of magnetically inert material to form a magnetizable image transfer medium, the composition being characterized by a proportion of magnetizable material at least equal in weight to the total of the other solid materials in the composition and consisting essentially of (a) a grease-like material selected from the group consisting of soft mineral waxes, animal fats and vegetable fats, (b) from 50 to 300 percent of a bodying agent selected from the group consisting of fatty acids having from 12 to 18 carbon atoms and the esters and metallic salts thereof, (c)'from 20 to percent of a hydrophobic, oilsoluble, normally-solid polymer selected from the group consisting of chlorinated rubber, cellulose esters and cellulose ethers, (d) from 200 to 350 percent of a volatile organic solvent capable of solvating the aforementioned materials, and (e) from 100 to 200 percent of a finelydivided magnetizable material selected from the group consisting of ferrosoferric oxide, gamma ferric
  • a magnetizable image transfer medium comprising a backing sheet of magnetically inert material having a coating on one surface thereof consisting essentially of a major proportion of finely-divided magnetizable material selected from the group consisting of ferrosoferric oxide, gamma ferric oxide, metallic iron, iron alloys andferrites dispersed in and carried by a composition consisting essentially of (a) a softening agent selected fromv the group consisting of soft mineral waxes, animal fats and vegetable fats, (b) from 50 to 300 percent of a bodying agent selected from the group consisting of fatty acids having from 12 to 18 carbon atoms and the esters and metallic salts thereof, and (c) from 20 to 100 percent of a hydrophobic, oil-soluble, normally-solid polymer selected from the group consisting of chlorinated rubber, cellulose esters and cellulose ethers, each percentage being based on the weight of the grease-like material, the amount of the finely-divided magnetizable material contained in the coating

Description

e. M. SUTHEIM ETAL 3,029,157
MAGNETIZABLE IMAGE TRANSFER MEDIUM Filed Nov. 18, 1958 April 10, 1962 MAGNETICALLY INERT BACKING SHEET INVENTORS GEORGE M. SUTHEIM HAROLD J. SOUTHCOMB 73, 14..., M, m /fl ATTORNEYS 3,iiZ9,l57 Patented Apr. 10, 1962 hce 3,029,157 MAGNETIZABLE WAGE TRANSFER MEDIUM George M. Sutheim and Harold J. Southcomb, Stamford, Conn., assignors to Audio Devices, Inc., New York, N.Y., a corporation of New York Filed Nov. 18, 1958, Ser. No. 774,581 2 Claims. (Cl. 11736.1)
This invention relates to magnetic coatings and, more particularly, to a coating composition adapted to form a magnetizable image transfer medium.
Physical image transfer media such as carbon paper, typewriter ribbons for single image transfer and duplicator stencils are commonly used to transfer a visual image from one medium to another. Each of these transfer edia comprises a supporting base of paper or plastic foil carrying a coating of a pigmented or dyed wax-containing material. Inasmuch as relatively little pigment or dye is required for this type of coating, the physical properties of wax are retained. Thus, the coating composition can be liquefied for application to the supporting base simply by melting the wax component of the composition, and after the composition solidifies it exhibits the characteristics of the wax, notably its softness, weak cohesive forces, freedom from tackiness and absence of cold flow, which make it particularly suitable for mechanical transfer of a visual image from one medium to another.
For the mechanical transfer of a magnetizable image from one medium to another, the strength of the magnetic response is directly proportional to the concentration of the magnetizable material in the composition. Accordingly, a relatively large percentage of magnetizable material must be incorporated in a magnetizable image transfer coating composition. Hot-melt compounds such as the waxes used for the aforementioned visual image transfer coating composition lose their desirable characteristics when such relatively large proportions of a magnetizable pigment are added to the waxes. Other conventional materials which are generally usefulin forming thin films, such as the resins and many plastics soluble at room temperature in technical solvents, are either too hard when dried or become tacky when softened by the addition of a plasticizer. Greases, on the other hand, are prone to cold flow even though the grease is relatively hard. The problem, then, is to produce a magnctizable image transfer coating composition which can be mechanically transferred from one medium to the other with the ease and clarity of detail characteristic of the visual image transfer coating compositions.
We have now discovered that it is possible to compound a mixture of finely-divided magnetizable material with a minor proportion of certain other materials with the result that the mixture exhibits the aforementioned desired magnetic and physical characteristics for a magnetizable image transfer coating composition. The composition of our invention consists essentially of (a) a grease-like material of the group consisting of soft mineral waxes, animal fats and vegetable fats, (b) a bodying agent of the group consisting of fatty acids having from 12 to 18 carbon atoms and the esters and metallic salts thereof, (c) a hydrophobic oil soluble normally-solid chain polymer, (d) an amount of a finely-divided magnetizable material at least equal to the total amount of the aforementioned materials, and (e) an organic solvent capable of solvating the normally-solid polymer and present in amount sufficient to impart a fluid consistency to the composition. The composition can be readily applied to a sheet of magnetically inert material to form, after the solvent has been driven off, a magnetizable image transfer medium which can be transferred mechanically from one medium to another like the aforementioned conventional visual image transfer mediums.
In the accompanying drawing, the single FIGURE is a fragmentary cross-sectional view of a magnetisable image transfer medium embodying the invention.
The grease-like materials that form the base of our new composition comprise soft mineral waxes such as petro latum and microcrystalline petroleum waxes, as well as animal and vegetable fats such as lanolin and cacao butter. These materials, whether used singly or in combina tion with one another, are supplemented by other materials, herein referred to as bodying agents, which add body to the grease-like materials. The bodying agents consist of fatty acids having from 12 to 18 carbon atoms and the esters and metallic salts thereof. Stearic acid, sorbitan monopalmitate, calcium stearate and barium stearate are representative examples of such bodying agents.
The bodied grease-like material is further reinforced by the addition of a minor proportion of a hydrophobic, oil-soluble, normally-solid chain-type polymer which is also soluble in a mutual solvent for the bodied greaselike material. Chlorinated rubber, cellulose esters, cellulose ethers and similar polymer compounds are efiective for this purpose. In the case of relatively inflexible polymers, such as the chlorinated rubber polymers, a plasticizer for the polymer may also be incorporated in the mixture. Dioctyl phthalate or dihexyl phthalate are particularly suitable, although other plasticizers such as dioctyl adipate or dioctyl sebacate are equally efiective.
The resulting mixture is solvated by any suitable solvent such as toluene. Although the solvent may be added directly to the mixture of grease-like material, bodying agent and polymer reinforcing agent, we have found that dissolution of all components is facilitated if the polymer is first dissolved in a portion of the solvent and the resulting polymer solution is then added to the other solid components along with the balance of the solvent.
The resulting mixture forms the carrier vehicle for the magnetizable material. The magnetizable material may comprise any of the finely-divided materials corn monly used as the magnetizable component of magnetic recording tapes and sheets, such, for example, as ferrosoferric oxide and gamma ferric oxide. Finely-divided metallic iron, iron alloys and magnetic ferrites are similarly useful.
The proportions of the aforementioned components of the composition of our invention are such that the amount of the bodying agent is at least one-half and preferably exceeds that of the grease-like material, that the amount of the polymer does not exceed and is generally less than the grease-like material, and that the amount of the solvent is suificient to impart flowability when these components are admixed with an amount of magnetizable material at least equal to the total amount of the nonvolatile components, to wit, the grease-like material, the bodying agent and the polymer. Percentagewise, the amount of the bodying agent varies between 50% and 300% by weight of the grease-like material, the amount of the polymer varies between 20% to by weight of the grease-like material, the amount of the solvent varies between 200% and 350% by weight of the total amount of the grease-like material, the bodying agent and the polymer, and the amount of the magnetizable material ranges between 100% and 200% by weight of the aforesaid total of the grease-like material, the bodying agent and the polymer.
The resulting composition is then applied by any conventional coating technique, such as by a doctor blade, to a sheet of magnetically inert material such as webs of paper, cellulose acetate, polyvinyl chloride and acetate polymers and co-polymers thereof, and a polyester such as the condensation product of ethylene glycol and terephthalic acid. The coating is advantageously about 0.25 mil thick, although thinner and thicker coatings are useful. The coated web is then cut into ribbons of any desired width by means of conventional slitting machinery.
The following specific examples are illustrative of the novel composition of our invention. In each example, the components which form the carrier vehicle for the magnetizable material were simply physically admixed and then the magnetizable material was added. The resulting mixture was then ground in a ball mill or the. like to insure thorough dispersion of the magnetizable material throughout the vehicle:
Example I Component Identity Parts by Weight Grease-like material Anhydrous lano1in. 15 Bodying agent Barium stearate 30 Polymer Chlorinated rubber l Polymer plastieizer Dioctyl pl1thalate. 15 Solvent Toluene 150 Magnetizable material Ferrosoferric oxide- 100 Example 11 Component Identity Parts by Weight Grease-like material Petzolatum 25 Bodying agent t Stearic acid 25 PolymeL Ethyl cellulose Solvent Toluene 150 Magnetizable material Ferrosoferric oxide- 100 Example 111 Component Identity Parts by Weight Grease-like material Anhydrous lanolin. 35 Bodying agent Sorbitan 25 monopalmltate.
Polymer Ethyl cellulose 10 S0lvent Toluene 200 Magnetizable material Ferrosoferric oxide. 100
Each of the products of Examples I, II and III was applied to a ribbon of cellulose acetate 0.5 mil thick, the thickness of the coating after drying being about 0.25 mil. The ribbons were tested by using them. as typewriter ribbons and were eifective in providing magnetizable typed letters and numeralson paper of a clarity equal to that of a conventional typewriter ribbon.
We claim:
1. A coating composition adapted when applied to a sheet of magnetically inert material to form a magnetizable image transfer medium, the composition being characterized by a proportion of magnetizable material at least equal in weight to the total of the other solid materials in the composition and consisting essentially of (a) a grease-like material selected from the group consisting of soft mineral waxes, animal fats and vegetable fats, (b) from 50 to 300 percent of a bodying agent selected from the group consisting of fatty acids having from 12 to 18 carbon atoms and the esters and metallic salts thereof, (c)'from 20 to percent of a hydrophobic, oilsoluble, normally-solid polymer selected from the group consisting of chlorinated rubber, cellulose esters and cellulose ethers, (d) from 200 to 350 percent of a volatile organic solvent capable of solvating the aforementioned materials, and (e) from 100 to 200 percent of a finelydivided magnetizable material selected from the group consisting of ferrosoferric oxide, gamma ferric oxide, metallic iron, iron alloys and ferrites, each of the percentages of the bodying agent and of the hydrophobic polymer being based on theweight of the grease-like material While each of the percentages of the organic solvent and of the magnetizable material are based on the total amountrof the aforementioned grease-like, bodying and hydrophobic materials.
2. A magnetizable image transfer medium comprising a backing sheet of magnetically inert material having a coating on one surface thereof consisting essentially of a major proportion of finely-divided magnetizable material selected from the group consisting of ferrosoferric oxide, gamma ferric oxide, metallic iron, iron alloys andferrites dispersed in and carried by a composition consisting essentially of (a) a softening agent selected fromv the group consisting of soft mineral waxes, animal fats and vegetable fats, (b) from 50 to 300 percent of a bodying agent selected from the group consisting of fatty acids having from 12 to 18 carbon atoms and the esters and metallic salts thereof, and (c) from 20 to 100 percent of a hydrophobic, oil-soluble, normally-solid polymer selected from the group consisting of chlorinated rubber, cellulose esters and cellulose ethers, each percentage being based on the weight of the grease-like material, the amount of the finely-divided magnetizable material contained in the coating being from 100 to 200 percent by weight of the composition.
References Cited in the file of this patent UNITED STATES PATENTS

Claims (1)

  1. 2. A MAGNETIZABLE IMAGE TRANSFER MEDIUM COMPRISING A BACKING SHEET OF MAGNETICALLY INERT MATERIAL HAVING A COATING ON ONE SURFACE THEREOF CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF FINELY-DIVIDED MAGNETIZABLE MATERIAL SELETED FROM THE GROUP CONSISTING OF FERROSOFERRIC OXIDE, GAMMA FERRIC OXIDE, METALLIC IRON, IRON ALLOYS AND FERRITES DISPERSED IN AND CARRIED BY A COMPOSITION CNSISTING ESSENTIALLY OF (A) A SOFTENING AGENT SELECTED FROM THE GROUP CONSISTING OF SOFT MINERAL WAXES, ANIMAL FATS AND VEGETABLE FATS, (B) FROM 50 TO 300 PERCENT OF A BODYING AGENT SELECTED FROM THE GROUP CONSISTING OF FATTY ACIDS HAVING FROM 12 TO 18 CARBON ATOMS AND THE ESTERS AND METALLIC SALTS THEREOF, AND (C) FROM 20 TO 100 PERCENT OF A HYDROPHOBIC, OIL-SOLUBLE, NORMALLY-SOLID POLYMER SELECTED FROM THE GROUP CONSISTING OF CHLORINATED RUBBER, CELLULOSE ESTERS AND CELLULOSE ETHERS, EACH PERCENTAGE BEING BASED ON THE WEIGHT OF THE GREASE-LIKE MATERIAL, THE AMOUNT OF THE FINELY-DIVIDED MAGNETIZABLE MATERIAL CONTAINED IN THE COATING BEING FROM 100 TO 200 PERCENT BY WEIGHT OF THE COMPOSITION.
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Cited By (22)

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US3177086A (en) * 1961-12-15 1965-04-06 Columbia Ribbon & Carbon Pressure-sensitive hectograph transfer element
US3194676A (en) * 1960-12-14 1965-07-13 Columbia Ribbon & Carbon Pressure sensitive transfer element
US3274111A (en) * 1962-09-17 1966-09-20 Sony Corp Magnetic recording medium with self-contained lubricant
US3337361A (en) * 1964-01-06 1967-08-22 Kee Lox Mfg Company Process of making pressure sensitive transfer sheet
US3375125A (en) * 1963-10-14 1968-03-26 Gen Electric Method of making transfer sheet and resultant article
US3382088A (en) * 1963-02-12 1968-05-07 Noda Ryuzo Method of manufacturing self-copying sheet
US3386847A (en) * 1964-10-16 1968-06-04 Burroughs Corp Silicone release coating transfer paper
US3416942A (en) * 1961-10-11 1968-12-17 Koreska Gmbh W Direct-transfer copy sheet
US3470021A (en) * 1966-04-21 1969-09-30 Gevaert Photo Prod Nv Magnetic recording material
US3525694A (en) * 1966-08-30 1970-08-25 Agfa Gevaert Nv Magnetic recording material
US3547693A (en) * 1968-01-12 1970-12-15 Eastman Kodak Co Magnetic tape
DE2451930A1 (en) * 1973-11-02 1975-05-07 Fuji Photo Film Co Ltd MAGNETIC RECORDING MATERIAL
US4110236A (en) * 1973-11-29 1978-08-29 Rockwell International Corporation Nondestructive magnetic recording medium
EP0027255A1 (en) * 1979-10-09 1981-04-22 Hitachi Maxell Ltd. Magnetic recording medium
US4291100A (en) * 1979-06-23 1981-09-22 Tdk Electronics Co., Ltd. Magnetic recording medium
US4303738A (en) * 1980-07-28 1981-12-01 International Business Machines Corporation Magnetic media having tridecyl stearate lubricant
US4395466A (en) * 1980-05-21 1983-07-26 Fuji Photo Film Co., Ltd. Magnetic recording medium
US4412929A (en) * 1982-03-10 1983-11-01 Lysenko Paul D Magnetic wall covering composition
US4414289A (en) * 1981-03-23 1983-11-08 Tdk Electronics Co., Ltd. High density magnetic recording medium
US4668586A (en) * 1984-10-18 1987-05-26 Basf Aktiengesellschaft Magnetic recording media
US5523167A (en) * 1994-08-24 1996-06-04 Pierce Companies, Inc. Indelible magnetic transfer film
US10589565B1 (en) 2017-03-03 2020-03-17 Kelly J. Taylor Erasable Writable Materials

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US1751310A (en) * 1926-10-01 1930-03-18 Wrangell Mathieu De Talking machine
US2106882A (en) * 1936-12-12 1938-02-01 Magnaflux Corp Paste of paramagnetic particles for use in the examination of paramagnetic materials for flaws by the magnetic method
US2236602A (en) * 1937-06-29 1941-04-01 Underwood Elliott Fisher Co Ink for carbon paper
US2313810A (en) * 1941-07-08 1943-03-16 Harold R Dalton Copying and recording medium
US2321316A (en) * 1941-05-17 1943-06-08 Dow Chemical Co Printing ink comprising cellulose derivatives
US2584318A (en) * 1949-07-22 1952-02-05 Ncr Co Marking member containing magnetized material
US2589306A (en) * 1948-03-30 1952-03-18 Helen J Steiner Bleachable transfer ink
US2593923A (en) * 1948-11-26 1952-04-22 Western Union Telegraph Co Method of making a telegraphic facsimile transmitting blank
US2647060A (en) * 1950-02-13 1953-07-28 Ontario Research Foundation Nonsmudging duplicating ink
US2729575A (en) * 1948-11-09 1956-01-03 Method of making same
US2744031A (en) * 1949-10-15 1956-05-01 Ncr Co Sheet having a transferable coating containing magnetizable material
US2912344A (en) * 1957-10-11 1959-11-10 Columbia Ribbon Carbon Mfg Pressure-sensitive transfer element for placing smudge-resistant marks

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1751310A (en) * 1926-10-01 1930-03-18 Wrangell Mathieu De Talking machine
US2106882A (en) * 1936-12-12 1938-02-01 Magnaflux Corp Paste of paramagnetic particles for use in the examination of paramagnetic materials for flaws by the magnetic method
US2236602A (en) * 1937-06-29 1941-04-01 Underwood Elliott Fisher Co Ink for carbon paper
US2321316A (en) * 1941-05-17 1943-06-08 Dow Chemical Co Printing ink comprising cellulose derivatives
US2313810A (en) * 1941-07-08 1943-03-16 Harold R Dalton Copying and recording medium
US2589306A (en) * 1948-03-30 1952-03-18 Helen J Steiner Bleachable transfer ink
US2729575A (en) * 1948-11-09 1956-01-03 Method of making same
US2593923A (en) * 1948-11-26 1952-04-22 Western Union Telegraph Co Method of making a telegraphic facsimile transmitting blank
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US2912344A (en) * 1957-10-11 1959-11-10 Columbia Ribbon Carbon Mfg Pressure-sensitive transfer element for placing smudge-resistant marks

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3194676A (en) * 1960-12-14 1965-07-13 Columbia Ribbon & Carbon Pressure sensitive transfer element
US3416942A (en) * 1961-10-11 1968-12-17 Koreska Gmbh W Direct-transfer copy sheet
US3177086A (en) * 1961-12-15 1965-04-06 Columbia Ribbon & Carbon Pressure-sensitive hectograph transfer element
US3274111A (en) * 1962-09-17 1966-09-20 Sony Corp Magnetic recording medium with self-contained lubricant
US3382088A (en) * 1963-02-12 1968-05-07 Noda Ryuzo Method of manufacturing self-copying sheet
US3375125A (en) * 1963-10-14 1968-03-26 Gen Electric Method of making transfer sheet and resultant article
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US10589565B1 (en) 2017-03-03 2020-03-17 Kelly J. Taylor Erasable Writable Materials
US11021004B1 (en) 2017-03-03 2021-06-01 Kelly J. Taylor Erasable writable materials
US11772410B1 (en) 2017-03-03 2023-10-03 Kelly J. Taylor Erasable writable materials

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