US3905876A - Electrorecording sheet - Google Patents

Electrorecording sheet Download PDF

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Publication number
US3905876A
US3905876A US420601A US42060173A US3905876A US 3905876 A US3905876 A US 3905876A US 420601 A US420601 A US 420601A US 42060173 A US42060173 A US 42060173A US 3905876 A US3905876 A US 3905876A
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United States
Prior art keywords
electrorecording
sheet according
cuprous iodide
color forming
color
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US420601A
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English (en)
Inventor
Kimiaki Yoshino
Kinichi Adachi
Wataru Shimotsuma
Yoichi Sekine
Toshio Shimizu
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Publication date
Priority claimed from JP47120898A external-priority patent/JPS5116155B2/ja
Priority claimed from JP3230273A external-priority patent/JPS5413990B2/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Application granted granted Critical
Publication of US3905876A publication Critical patent/US3905876A/en
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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
    • B41M5/20—Duplicating or marking methods; Sheet materials for use therein using electric current

Definitions

  • the present invention relates to an electrorecording sheetfor converting'electrical signals directly to yi's' 'ual images adapted to be used inan ii'iformation recording apparatus'suchas fa facsimile, a character printer, an analog recorderor the like? i i
  • Prior art recording materials usable for the samepurpose as that of the present invention include asp'arking record paper,an'electrolytic recording paper or the As is well-known in the art, the sparking record paper consists of a black conductive layer of carbon and an overlying layer comprising a white semiconductive me ⁇ tallic. compound and bin der material, in whichrecofrd ing images are formed bypassing eurrent thereacrjoss to destroy portions of white layer and spatter them away to expose the conductive layer.
  • the recording sheet of thistype is cha i'ac terized'by a dry system, a high recording'speeilow cost and elimination of need of developingand fixingpr'ocesses, but has a disadvantage in that a considerable amount of smoke and odor are generated upon sparking.
  • the electrolytic recording sheets are classified in two types, one in whieh metal ions of a recording electrode react with electrolyte impregnated in the recording paper and the other in the electrolyte is decomposed by current so'th'at the products therefrom form color.
  • The'electrorecording sheet of the present invention comprises a heat sensitive, color forming component which forms color or changes color upon application of heat energy thereto, cuprous iodide which imparts conductivity to the recording sheet and a support sheet bearing the above components.
  • a record is marked by flowing current across a recording stylus electrode in contact with the recording sheet and a counterelectrode to cause color forming or color change of the heat sensitive color forming component in those selected areas adjacent to the recording stylus, through which areas current has been passed.
  • the electrorecording sheet of thepr'esent invention uses transparent or light yellow cuprous iodide as a conductive material and the heat sensitive color forming component forms color or changes color by flowing electric current. Accordingly, neithera colored layer:
  • the recording sheet of the present invention can be used as a copying base paper utilizin'g transmitted light.
  • cuprous iodide is hardly influenced by environmental temperature and humidity, no storage container as required as is necessary in wet type recording sheets and recording can'always be carried out under a constant condition,
  • the resistivity of the conductive material be less than several-(Lem, and when this-material is applied on or mixed with a support sheet the surface resistivity of a finished recording sheet be less than several KS)..- This is because; by reducing the surface resistivity a high speed recording of about 3.5 m/ sec. can be effectedwith the applied voltageof'200 300 V.
  • cuprous iodide having the resistivity of 10 (Item which is produced by the reaction of potassium iodide and copper sulfate,' suchcuprous iodide must be applied or contained in an amount of about 30 g/m?.
  • conductive material
  • the finished recording sheet does not exhibit the nature of a plain paper, makes it difficult to be used in trans rriitting light recording sheet increases.
  • the present invention is based on and'the costof the recording the discov :ery of the fact that a material which imparts a free iodine component to cuprous iodide is effectively used as resistance lowering agent for lowering the resistance of cuprous iodide.
  • those materials may be used, which by themselves can impart'an c omponentsuch as iodine or compound of iodine such as iodoform,tetraiodomethane, and an oxidizing agent .which serves to oxidize cuprous iodide to liberate an iodine component thereof such as potassium permanm It has been known that in an ion crystalhavin'g a composition which deviates from a stoichiometric one, a p-type semiconductivityis obseryedwhenf metal ions are short (or anions are excessive). As an example, it is known that in an ion crystalhavin'g a composition which deviates from a stoichiometric one, a p-type semiconductivityis obseryedwhenf metal ions are short (or anions are excessive). As an example, it
  • cuprous iodide is .in the range of 0.05 0.2 by weight, which cuprous iodide is used as the conductive material for the electrorecording sheet.
  • the appearance after application of the conductive material is dirty and the excess iodine may fade out during the storage of the recorded sheet. Thus, it is inconvenient for practical use.
  • potassium permanganate it is considered that it serves as an oxidizing agent for cuprous iodide and removes copper ions from cuprous iodide to produce vacant lattice points of Cu in order to enhance the properties of a p-type semiconductor.
  • a suitable conductive material for the electrorecording sheet was obtained when the amount of excess'iodine of cuprous iodide was in the range of 0.05 0.2 by weight.
  • the cuprous iodide with said resistance lowering agent did not show any change after a test at an environmental temperature of 60C and undenreduced pressure conditions (I mI-Ig) for 8 hours.
  • FIG. l shows a construction of a form of recording sheet in accordance with the present invention
  • FIG. 2 illustrates a recording method
  • FIG. 3 8 show various forms of construction of recording sheets, in accordance with the present invenof cuproiis iodide having the resistance lowering agent therewith and an overlying color forming layer 3 including a color forming component which, in response to electric signals, forrris color upon application of heat energy thereto.
  • Recording is effected by flowing electric current from an A.C. or DC. power supply 7, by
  • FIG. 1 is a typical example of the construction. Various modifications may be constructed. Examples thereof are shown in FIGS. 3 8.
  • the recording sheet shown in FIG. 3 comprises a single layer 10 consisting of a heat sensitive color forming component and cuprous iodide, formed on a surface of the support I.
  • the recording sheet shown in FIG. 4 comprises a conductive layer such as aluminum vapor deposition layer ll formed on the support 1 similar to that shown in FIG. I, and a conductive layer 2' of cuprous iodide and a color forming layer 3 successively formed thereon.
  • a conductive layer such as aluminum vapor deposition layer ll formed on the support 1 similar to that shown in FIG. I, and a conductive layer 2' of cuprous iodide and a color forming layer 3 successively formed thereon.
  • the recording sheet shown in FIG. 5 comprises a conductive layer 12 of carbon on a surface of the support 1 and an overlying layer 10 including a heat sensitive color forming component and cuprous iodide.
  • the recording sheet shown in FIG. 6 uses a carbon impregnated paper 13 in place of the support 1 shown in FIG. 3.
  • the recording sheet of FIG. 7 comprises a cuprous iodide impregnated paper 14 as a support and a color forming layer 3 thereon.
  • the recording sheet of FIG. 8 is formed by a paper in which cuprous iodide and heat sensitive color forming component are impregnated together.
  • Examples 1 and 2 described later are in accordance with the construction of FIG. 1 and the examples 3 through 7 are in accordance with the constructions of FIGS. 3 through 7, respectively.
  • Heat sensitive color forming material Those which form color in response to heat energy upon flowing current. They include a. combination of color forming dye such as crystal violet lactone and color forming agent of phenolic acidic material such as bisphenol A.
  • c. redox indicator These materials are dispersed in binder material to form color forming component.
  • R,., R and R are individually a hydrogen or halogen atom, or a hydroxyl, alkyl, nitro, amino, dialkylamino, monoalkylamino or aryl group; and Z is an atom necessary to form a heterocyclic ring, and is O or S.
  • i I I
  • a-l i is a phenolic compound or an organic acid. It is desirable that thelsaid compoundor acid is solid at room temperature and can liquefy or vaporize at about70C.
  • organic aci d examples are as follows: Ste aric, gallic, benzoic, salicylic,' succinic, l-hydroxy- "2' naphthoic, 2-hydrox'y p-toluic, A ohydroliiybe nzoic, rn-hydroxybenzoic, phydroii'ybenzoic and 4-hydroxypl1'thalicacids b.
  • Organic spot reagent and-organic metal salt The organic spot'rea'gent referred toherein is' a com; pou'nd capable of being colored or discoloredby reaction with metalions. At'present, a large number of such compounds are'known.
  • the phenome non that at least' one of the organic spot reagent and the metal used in combination therewith is melted due to the heat energy generated at the time of application of electric currentand the tworeact with each other to'form a color. It is'therefore dc- 'sirable that one of the two which is lower in melting point is solid at below 70C. and has a melting point of l5()C. or less. In this respect, metallic 'soap is most preferable as the organic metal salt. Combinations of the organic spot reagent and the metal areas follows; I i 1.
  • Dimethylglyoxime Nickel-stearate (Pink)
  • Pink Nickel-stearate
  • p,p'-Tetramethyl-diaminodiphenylmethane
  • organic metal salt a metallic soap having the aforesaidmetal ions is effective.
  • organic spotreagents with organic metal salt s,-and color tones of colors developed by use *of said combinations, are shownbelow.
  • Organic spot reagent - Organic metal salt Color tone Benzoinoxime: Copper myristate (Yellowish green) I Dithiooxamide: Nickel stearate (Purple) 8l-lydroxyquinoline: Iron oleate"'(Black) Gallic acid: Ferric stearate (Black-)3 5 Alizarin: Copper oleate (Purplish red)- Quinalizarin: Copper oleate (Purplish/red)" Diphenylcarbazone: Copper stejarate Red) 'Diphenylcarbazone: Cadmium stearate (Red)- c.
  • redox indicator forms a color..in the vicinity of recording stylus at the time of application of electric current, and it has-been confirmed that said substance is effective as a color-forming material'for use in'electrorecording paper.
  • the redox indicator referred to herein is a substance which is colored or discolored due to oxidation with the heat generated at the time of application of electric current, and is a leuco body ispreferable in-view of the whiteness of the background. Examples of the redox indicators used in the present invention, and color tones of colors developed by said'indicators, are shown below.
  • Iodine b. Iodine compound iodoform, tetraiodomethane, iodine salt, periodate, iodate, hypoiodate c. Peroxide hydrogen peroxide, sodium peroxide, barium peroxide d. Oxyaeid salt hypochlorite, chlorate, perchlorate, bromate e. Peroxo acid peroxo-disulate, peroxo-sulfuric acid, peroxophosphoric acid f. Permanganate permanganic acid, poteassium permanganate, sodium permanganate, calcium permanganate, etc.
  • Binder In order to disperse in the state of fine particles the olor forming dye, color-forming agent, organic pot reagent and organic metal salt used in the col- .or-developing layer, and/or cuprous iodide and resi s tance lowering agent, and to impart bonding ability thereto, there is used a binder. Since most of the above-mentioned color-forming dyes, colorforming agents, organic spot reagents and cuprous iodide are "water-insoluble, the use of a watersoluble binder is effective. Further, the water ,soluble'substance has such characteristics that it is easily handled and treated at the time or production of recording paper.
  • water-soluble binder' examples include hydroxyethyl-cellulose, carboxymethyl cellulose, methoxy cellulose, polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylamide, polyacrylic acid, gelatin, starch, and gum arabic.
  • an organic solvent-soluble binder may 1, also be used.
  • a binary system comprising,
  • a color-forming dye and a colorforming agent for example, a color-forming dye and a colorforming agent
  • the two components should individually be dispersed in the form'of fine particles into the binder. If either one of the.- two components is dissolved in a solvent used to dissolve the binder, a color formation reaction to deprive its function as a recording medium takes place at the time of mixing of the two. Accordingly, solvents for the binder mentioned herein are necessarily limited depending on the kind of color-forming components.
  • water-insoluble binder examples include natural rubber, synthetic rubbers, chlorinated rubbers, alkyd resins, styrene-butadiene copolymers, polybutyl methacrylate, low molecular weight ethylene polymers, low molecular weight styrene polymers, polyvinyl butyral, phenolic resins and nitrocellulose.
  • EXAMPLE 1 Mixed with 200 parts by weight of aqueous solution containing 1 by weight of polyvinyl alcohol (PVA 124 prepared by KURARE Co., Ltd.) was 200 parts by weight of cuprous iodide (prepared by KANTO CHEMICAL Co, Ltd.), and they were milled and mi-xed b y a mixer for two hours. During this process, 1 ml of aqueous solution containing 2 by weight o f-potassium permanganate was added. The dispersion solution thus formed is referred to as solution A.
  • the dispersion solution A was applied on an artificial paper by a wire bar conditioned to form a coating layer of 8 microns in thickness (15 g/m in application quantity).
  • the surface resistivity thereof was 3.5 4.5 X 10 Q.
  • the surface resistivity was 2 5 X 10 0.
  • the surface resistivity was considerably reduced by the addition of KMnO as the resistance lowering agent to CuI.
  • solution B the color forming material scarcely dissolved but dispersed in the form of fine particles of no greater than 5 microns.
  • solution C a dispersion solution hereinafter referred to as solution C.
  • the color forming agent in the solution C also dispersed in the form of fine particles of no greater than 5 microns. Since the particles are surrounded by polyvinyl alcohol there is no direct contact between the particles. 15 parts by weight of the solution B and parts by weight of the solution C were measured and mixed together while agitating. The resulting solution is referred to as solution D.
  • the solution D was applied to the artificial paper on which the solution A had previously been applied, by a iivire bar conditioned to provide a coating layer of aboutS microns in Zthickness.
  • the paper was then dried to form a electrorecording sheet.
  • the surface resistivity of the recording sheet thus formed was 4.2 K0 and could provide a sharp record having a reflective optical density of 0.88 by using recording voltage of 300 V. Furthermore, it was possible with this recording sheet to carry out transmitted light copying.
  • EXAMPLE 2 Added to 200 parts by weight of hydroxyethylcellulose (Cellosise WP-300I-I prepared by Union Carbide International Co.) was 200 parts by weight of cuprous iodide and 0.5 parts by weight of iodine (prepared by KANTO CHEMICAL Co., Ltd.), and they were milled and mixed by a mixer for 2 hours. The dispersion solution thus prepared is referred to solution E. The dispersion solution E was then applied on an artificial paper by a wire bar conditioned to provide a coating layer of 10 microns in thickness, and the paper was dried. The surface resistivity after application was 2 3 X 10 Q.
  • solution F added to 100 parts by weight of aqueous solution containing 5 by weight of hydroxyethylcellulose (Cellosise WP-09L) was 20 parts by weight of 3,3 bis(- p-dimethylaminophenyl)-6-dimethylaminophthalide as color forming material, and they were milled and mixed in a ballmill for 48 hours.
  • solution F added to 100 parts by weight of aqueous solution containing 5 by weight of hydroxyethylcellulose (Cellosise WP-09L) was 35 parts by weight of 4,4'-isopropylidenediphenol as color forming agent, and they were milled and mixed in a ballmill for 48 hours.
  • solution G added to 100 parts by weight of aqueous solution containing 5 by weight of hydroxyethylcellulose (Cellosise WP-09L) was 35 parts by weight of 4,4'-isopropylidenediphenol as color forming agent, and they were milled and mixed in a
  • EXAMPLE 3 weight of both mixture were mixed to prepare solution I.
  • I00 parts by weight of the solution H and 30 parts by weight of the solution I were mixed by a mixer and applied onto a paper with the thickness of 15 microns. It was then dried to form a light yellow recording sheet.
  • the surface resistivity of the recording sheet was 1.45 X 10 .Q and a sharp, dark gray record having reflective optical density of 0.80 was obtained at the recording voltage of 300 volts.
  • the structure'of the recording sheet is shown in FIG. 3.
  • a color forming conductive layer 10 is provided on the paper 1.
  • the recording sheets were prepared with varying amounts of iodoforrnv addition tocuprous iodide in the solution H to determine the value of the recording voltage at which the reflective optical density of the record trane showed 0.80. The result is given below.
  • the surface resistivity of the recording sheet could be reduced by adding iodoform to cuprous iodide to provide a record having a sufficient density at a relatively low recording voltage.
  • EXAMPLE 4 Added to I00 cc of toluene solution containing 10 by weight of copolymer of styrene and butadiene at .the ratio of 15 were grams of cuprous iodide and 0.5 grams of,tetraiodomethane,and they were milled and mixed in a ballmill for 48 hours.
  • the dispersion solution thus prepared was applied onto an aluminum de posited paper by a wire bar conditioned to provide a coating layer of 15 microns, and the paper was dried.
  • the surface resistivity of the applied paper was 4.3 X
  • aqueous solution containing I0 by weight of polyvinyl alcohol was 35 parts by weight of 3-dimethylamino-6- methoxyfulorane as color forming material, and they were milled and mixed in a ballmill for48 hours, 10 parts by weight of this mixture, 10 parts by weight of the solution C defined in the ExampIe l and 5 parts of the dispersion solution of cuprous iodide including tetraiodomethane were mixed together and then applied onto said conductive layer by a wire bar conditioned to provide a coating layer, of l0irnicrons in thickness.
  • the structure of the recording sheet thus formed is shown in FIG. 4.
  • Aluminum deposited layer 11 is formed on the paper 1, and a conductive.
  • the surface resistivity was 8.3 X 10 .Q and sharp, red record having the reflective optical density of 0.85 was obtained at the recording voltageof 350 V.
  • the recording sheet prepared otherwise under the same conditions showedthe surface'resistivity of 6 X l0 Q and provided the record having reflective optical density of 0.35 at the recording voltage of 600 V.
  • FIG. 5 shows the structure of the recording sheet. Carbon layer 12 and color forming conductive layer 10 are 'formed on the paper 1.
  • I I i wr a is claimed is:; Y
  • An electrorecording sheet comprising a heat sensitive'color forming componen t for forming color or changing its color. upon application of heat .energy thereto, cuprous iodide. for imparting conductivity and a support for carrying the above, components, said electrorecording sheet for providing arecorded mark when electric current is flowed therethroughin selected areas thereof, by the fact that the heat sensitive color forming component in said selected areas forms color or changes its color, said sheetadditionally comprising a resistance lowering agent for providing ,saidcuprous iodide with a freeiodine componentto lower resistance 2.
  • An electrorecording sheet accordingto, claim 1, wherein said resistance-loweringagent is a material ca- -,pable of providing its own iodine component. 3.
  • nent is iodine
  • An electrorecording sheet according to claim 3, wherein said oxidizing agent includes at least'one material selected from the group consisting of peroxide, oxyacid salt and peroxo acid.
  • thermorecording sheet is a combination of a'leucb body of tri-phenylmethane 0 dye or a leuco body of fluo'ranesdyeand organic acid or-phenolic materials 4 i 9.
  • said heat sensitive color forming component is a combination of metallic salt and an organic spot reagent which repidly reacts with metal ions of said metallic salt to provide a" reaction product having appreciabl'e visual change, one-of said two materials which has the lower melting point has a melting point of 70 10.
  • said heat sensitive color forming component is a leuco body of redox indicator.
  • cuprous iodide and said resistance lowering agent are dispersed in binder material and applied as a conductive layer on said support, and said heat sensitive color forming component is dispersed in binder material and applied as a color forming layer on said conductive layer.
  • said color forming layer further includes a resistance lowering agent.
  • An electrorecording sheet comprising:
  • a heat sensitive color forming component for forming color or changing color upon the application of heat energy thereto
  • a resistance lowering agent for providing said cuprous iodide with a free iodine component for lowering the electrical resistance of the cuprous iodide

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  • Color Printing (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
US420601A 1972-11-30 1973-11-30 Electrorecording sheet Expired - Lifetime US3905876A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP47120898A JPS5116155B2 (enrdf_load_stackoverflow) 1972-11-30 1972-11-30
JP3230273A JPS5413990B2 (enrdf_load_stackoverflow) 1973-03-20 1973-03-20

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US (1) US3905876A (enrdf_load_stackoverflow)
AU (1) AU463673B2 (enrdf_load_stackoverflow)
CA (1) CA990953A (enrdf_load_stackoverflow)
FR (1) FR2209330A5 (enrdf_load_stackoverflow)
GB (1) GB1445757A (enrdf_load_stackoverflow)
NL (1) NL165413C (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4046074A (en) * 1976-02-02 1977-09-06 International Business Machines Corporation Non-impact printing system
US4133933A (en) * 1975-06-27 1979-01-09 Matsushita Electric Industrial Co., Ltd. Electrosensitive recording sheet with support containing cuprous iodide particles
US4211616A (en) * 1979-05-24 1980-07-08 International Business Machines Corporation Electrochromic printing system
US4217596A (en) * 1977-10-27 1980-08-12 Robert Bosch Gmbh Recording carrier for electrical discharge recording apparatus
US4375492A (en) * 1981-05-22 1983-03-01 Appleton Papers Inc. Dielectric record material
US4392141A (en) * 1977-05-16 1983-07-05 Canon Kabushiki Kaisha Image forming method
US4444626A (en) * 1983-01-21 1984-04-24 International Business Machines Corporation Electrochromic printing
US4556892A (en) * 1985-03-28 1985-12-03 Polaroid Corporation Thermal transfer recording system and method
US4603337A (en) * 1985-03-28 1986-07-29 Polaroid Corporation Thermal transfer recording medium
US5108861A (en) * 1990-08-28 1992-04-28 Xerox Corporation Evaporated cuprous iodide films as transparent conductive coatings for imaging members

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9103540D0 (en) * 1991-02-20 1991-04-10 Feldman Michael Marking specimen slides

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3518038A (en) * 1965-10-20 1970-06-30 Allied Chem Electrographic recording mixture containing a morpholinyl diphenyl methane and 2 triphenyl methane
US3642475A (en) * 1967-10-02 1972-02-15 Agfa Gevaert Nv Method of recording and reproducing information
US3655527A (en) * 1970-09-14 1972-04-11 Bell Telephone Labor Inc Electrolytic printing using polyvinyl alcohol
US3789425A (en) * 1971-06-13 1974-01-29 Colorfax Co Ltd Electro-sensitive recording medium having a plurality of recording layers
US3792481A (en) * 1971-07-13 1974-02-12 Canon Kk Method of recording by heat sensitive multicolor indication

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3518038A (en) * 1965-10-20 1970-06-30 Allied Chem Electrographic recording mixture containing a morpholinyl diphenyl methane and 2 triphenyl methane
US3642475A (en) * 1967-10-02 1972-02-15 Agfa Gevaert Nv Method of recording and reproducing information
US3655527A (en) * 1970-09-14 1972-04-11 Bell Telephone Labor Inc Electrolytic printing using polyvinyl alcohol
US3789425A (en) * 1971-06-13 1974-01-29 Colorfax Co Ltd Electro-sensitive recording medium having a plurality of recording layers
US3792481A (en) * 1971-07-13 1974-02-12 Canon Kk Method of recording by heat sensitive multicolor indication

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4133933A (en) * 1975-06-27 1979-01-09 Matsushita Electric Industrial Co., Ltd. Electrosensitive recording sheet with support containing cuprous iodide particles
US4046074A (en) * 1976-02-02 1977-09-06 International Business Machines Corporation Non-impact printing system
US4392141A (en) * 1977-05-16 1983-07-05 Canon Kabushiki Kaisha Image forming method
US4217596A (en) * 1977-10-27 1980-08-12 Robert Bosch Gmbh Recording carrier for electrical discharge recording apparatus
US4211616A (en) * 1979-05-24 1980-07-08 International Business Machines Corporation Electrochromic printing system
US4375492A (en) * 1981-05-22 1983-03-01 Appleton Papers Inc. Dielectric record material
US4444626A (en) * 1983-01-21 1984-04-24 International Business Machines Corporation Electrochromic printing
US4556892A (en) * 1985-03-28 1985-12-03 Polaroid Corporation Thermal transfer recording system and method
US4603337A (en) * 1985-03-28 1986-07-29 Polaroid Corporation Thermal transfer recording medium
EP0200711A3 (en) * 1985-03-28 1989-05-10 Polaroid Corporation Thermal transfer recording medium
US5108861A (en) * 1990-08-28 1992-04-28 Xerox Corporation Evaporated cuprous iodide films as transparent conductive coatings for imaging members

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GB1445757A (en) 1976-08-11
DE2359271B2 (de) 1976-03-18
DE2359271A1 (de) 1974-06-27
NL7316317A (enrdf_load_stackoverflow) 1974-06-04
NL165413B (nl) 1980-11-17
NL165413C (nl) 1981-04-15
FR2209330A5 (enrdf_load_stackoverflow) 1974-06-28
AU6299873A (en) 1975-05-29
CA990953A (en) 1976-06-15
AU463673B2 (en) 1975-07-31

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