US3792481A - Method of recording by heat sensitive multicolor indication - Google Patents

Method of recording by heat sensitive multicolor indication Download PDF

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Publication number
US3792481A
US3792481A US00270195A US3792481DA US3792481A US 3792481 A US3792481 A US 3792481A US 00270195 A US00270195 A US 00270195A US 3792481D A US3792481D A US 3792481DA US 3792481 A US3792481 A US 3792481A
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heat sensitive
recording
color forming
indication according
color
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US00270195A
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English (en)
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S Nagashima
T Watanabe
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Canon Inc
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Canon Inc
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
    • G06K1/12—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
    • G06K1/126—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching by photographic or thermographic registration
    • 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
    • B41M5/34—Multicolour thermography

Definitions

  • FIG-3 FIG. I
  • HEAT SENSITIVE HEAT SENSITIVE LAYERI LAYER 11 I DENSITY OF FORMED COLOR COLOR FORMING TEMPERATURE CONTROL 7 CIRCUIT ⁇ vm ⁇ /////////l ////l III METHOD OFRECORDING BY HEAT SENSITIVE MULTICOLOR INDICATION BACKGROUND OF THE INVENTION 1.
  • This invention relates to a method of recording by heat sensitive multicolor indication and a heat sensitive recording material used in said method.
  • the components of a heat sensitive recording system are usually a basic color forming material and an acidic material such as diphenol at a colorless state; and, upon application of a heat pattern the system-causes liquefication or vaporization of the acidic material such as diphenol and then the acidic material thus liquefied or vaporized contacts with the basic color forming material to form color.
  • the colorless components of the recording system are usually contained in a single supporting sheet referred to as a self containin system.
  • Another t e of heat sensitive recording system is that composed of two sheets, i.e. one sheet having the first component and the other sheet having the second component. Each component is placed face to face and thereby one component, liquefied or vaporized by application of a heat pattern, transfers to the other component to form a recording. This latter system is known as a transferring system.
  • heat-sensitive recording material for such a new recording method there may be used a conventional heat sensitive recording material for usual copying when it is appropriately improved.
  • a conventional heat sensitive recording material for usual copying when it is appropriately improved.
  • An object of this invention is to provide a method of multicolor indication of figures such as letters, numbers and the like by using a heating element.
  • Another object of this invention is to provide a mechanically silent printing method.
  • a further object of this invention is to provide a multicolor heat sensitive recording material suitable for the above mentioned process.
  • Still another object of this invention is to provide a recording material for indicating printed letter recording of different color tone on the same recording sheet or tape.
  • a still further object of this invention is to provide a multicolor recording material capable of producing a permanent print.
  • the method of recording by heat sensitive multicolor indication according to the present invention can be attained by combining a heating element and a heat sensitive recording material for multicolor indication.
  • a heating element in the present invention there may be used, for example, a heating head as described in U.S. Pat. No. 3,496,333 to E.G. Alexander. Particularly, there is preferred a heat element device having a control circuit containing a current control device capable of switching between a low temperature heating element and a high temperature heating element.
  • the heat sensitive material for multicolor indication of the present invention is fundamentally composed of a multilayer heat sensitive recording layer overlying a support, e. g. paper or film, but, if desired, a self-supporting layer may be employed which is produced by admixing a color forming main agent or a color forming auxiliary agent with the support material or making the support layer therefrom.
  • the heat sensitive recording material for multicolor indication comprises a heat sensitive recording layer of multilayer type overlying a support, and the laminating is effected in an order of heat sensitive temperatures ranging from about-60C to about C. Different colors are formed depending each specific heat sensitive temperature of the layers in a direction from the outermost layer to the support layer or in the opposite direction.
  • FIG. 1 shows a cross sectional view of a heat sensitive material according to the present invention
  • FIG. 2 is a graph showing temperature characteristic of each heat sensitive layer
  • FIG. 3 diagrammatically shows application of a heat element to a heat sensitive material
  • FIG. 4 diagrammatically shows a heat element provided with a current control circuit.
  • a heat sensitive material is composed of a support 1 such as paper and film, a heat sensitive layer II 2 overlying the support and a heat sensitive layer I 3 overlying the heat sensitive layer II.
  • the heat sensitive layer I forms color at a temperature of T (low temperature) while the heat sensitive layer II does not form color at all at T, but forms color at T when the temperature is raised from T to T
  • the heat sensitive layer I has already formed color.
  • the color of the heat sensitive recording multilayer is magenta at a temperature T and violet at a temperature T since magenta and cyanic colors are mixed.
  • a heat element for low temperature 5 and a heat element for high temperature '6 which are connected with control circuits (not shown) come in contact with or approach the heat sensitive recording multilayer, and the heat element for low temperature 5 causes a magenta color indication and the heat element for hightemperature 6 causes a purple color indication.
  • the sensitive material of FIG. 1 is dyed to yellow, the color at low temperature (T,) is red as a result of combination of magenta and yellow and the color at high temperature (T is black as a result of combination of ma genta, cyanic and yellow.
  • T the color at low temperature
  • T the color at high temperature
  • red and black printings can be effected on a yellow background.
  • the device is different fronf that in FIG. 3 and only one heat element 4 is used, and
  • control circuit 7 to indicate figures, letters and other patterns with two different colors.
  • the performance is similar to the above one and different colors corresponding to the number of layers can be employed for indication.
  • present invention essentially comprises a color forming main agent and a color forming auxiliary agent and if desired, additionally contains a softening point adjusting agent, a binder and other additives.
  • nae asrsrf'arain' main agent is a basic-'riiaEeriTfiai/ ing a color forming group.
  • Representative color forming main agents are: diaryl phthalides such as 3-3 bis (p-dimethyl amino phenol)-6-dimethyl amino phthalide (Crystal Violet Lactone), 3-3 bis (p-dimethyl amino phenol) phthalide (Malachite Green Lactone) and the like; leuco auramines such as N-halophenyl derivatives, N-alkyl halophenyl derivatives, N-(2,5- dichlorophenyl) leuco auramine and the like; acryl auramines such as N-benzoyl auramine, N-acetyl auramine and the like; a,B-unsaturated arylketones such as dianisylidene acetone, dibenzylidene acetone, anisylidene acetone and the like; basic mono
  • fieeastr655iagamamgms used inth'is invaar tion are a material capable of thermally reacting with the color forming main agent to form a conjugated systern such as, for example, phenolic compounds, phenol derivatives, phenolic resins and the like.
  • These phenolic materials have melting points ranging from 60 to C. It is preferable to use the material of lower melting point or softening point in a heat sensitive layer close to the heating element and the material of higher melting point or softening point in a heat sensitive layer far from the heating element.
  • the softening point adjusting agent should be mutually soluble with the color forming main agent and/or color forming auxiliary agent to lower the softening point. They are, for example, low melting point materials, higher fatty acids and crystalline solid plasticizers.
  • Representative higher fatty a cids are those having 12-20 carbon atoms and 50-150C of melting point, such as lauric acid, palmitic acid, stearic acid, myristic acid and the like. 7
  • crystalline sohd plasticiaers are diphenyl phthalate (DPP), dichlorohexyl phthalate (DCHP), ethylene glycol dibenzoate (EGDB), di-v methyl isophthalate (DMIP) and the like.
  • methyl cellulose As siiia'ers ue'aifi the presfi't'tnvemias, there i may be mentioned methyl cellulose, arabian gum, gelatine, sodium alginate, casein, zinc caseinate, sodium carboxymethyl cellulose, polyvinyl alcohol, pectine, polyvinyl pyrrolidone, starch and its derivatives, copolymer of styrene and maleic anhydride, copolymer of polyethylene and maleic anhydride, copolymer of polyvinyl pyrrolidone and maleinic anhydride, polyacrylate and its copolymer, copolymer of styrene and butadiene, emulsions of polyvinyl chloride, polymethyl methacrylate and polyvinyl acetate and the like.
  • arabian gum zinc caseinate, copolymer of styrene and maleic anhydride, and copolymer of styrene and but
  • Color formation caused by combining the representative color forming main agents is as shown in Table 1 below.
  • a feature of this invention resides in the fact that recordings of different colors can be formed on one and the'same recording sheet or tape by controlling the heating temperature of a heating element.
  • a desk top calculator it is possible in a desk top calculator to indicate the calculating procedure with blue color and the answer and sum with red color, and further in a thermal printer an important sentence can be printed with red color while an unimportant sentence can be printed with blue color.
  • conventional typewriters there are also employed two color indications, but mechanical typewriters are noisy and only predetermined numbers or letters can be printed. On the contrary, color of a part or a half of each letter or number can be changed according to the present invention.
  • a heating element which is composed of a linear matrix containing many minor heating portions arranged on one line, and the heating element is moved in a direction perpendicular to the linear matrix and the current supplied to each minor heating portion is controlled corresponding to a pattern.
  • a multicolor pattern divided into each dot in place of a full letter or number.
  • Such multicolor dot pattern can not be produced by conventional mechanical typewriters.
  • EXAMPLE 1 became 2-3 microns in size. Then. the above two compositions were mixed and coated on a support (60 microns thick) in 2-5 microns thick (when dried) by a wire bar.
  • Rhodamine lactone (RL) and 10 parts of a copolymer of styrene and maleic anhydride were mixed and ground for one hour until particles of RL became 0.5-2 microns in size.
  • a mixture of 55 parts of phenolic resin, 10 parts of a copolymer of styrene and maleic anhydride and 5 parts of myristic acid were ground for one hour until the phenolic resin became 1-2 microns in size.
  • the two compositions obtained above were mixed and coated on the high temperature color forming layer as obtained above in 2-5 microns thick (when dried) by a wire bar to produce a heat sensitive recording material for two color indication.
  • Printing was effected on the resulting heat sensitive material for two color indication by using a heating element at a relatively low temperature (about 60-l 10C) to produce a red pattern. On the contrary when printing was effected at relatively high temperature (1 l0l60C) there was obtained clear violet pattern. Current flow was applied for 5-20 m.sec. in each case.
  • EXAMPLE 2 High temperature color forming composition: Twenty parts of CVL and lOparts of a copolymer of styrene and maleic anhydride were mixed and ground for one hour until the particle size became 0.5-2 microns. On the other hand, 60 parts of bisphenol A and 10 parts of a copolymer of styrene and maleic anhydride were mixed and ground for one hour until particle size of the bisphenol A became l-3 microns. The resulting two compositions were mixed with stirring and coated on a paper (60 microns in thickness) in 2-5 microns thick (when dried) by a wire bar.
  • RL Twenty parts of RL and 10 parts of a copolymer of styrene and maleic anhydride were mixed and ground for one hour until the RL particle became 0.5-2 microns.
  • the resulting two compositions were mixed thoroughly and coated on the high temperature color forming layer as obtained above in thickness of 2-5 microns (when dried) by a wire bar.
  • the resulting heat sensitive recording material was subjected to printing test as mentioned in Example 1 above to produce clear bluish violet color.
  • the high temperature color forming layer as obine fixaxnpls.tuasstmflsmd;
  • RL Twenty parts of RL and 10 parts of a copolymer of styrene and maleic anhydride were mixed and ground for one hour until particle size of the RL became 0.5 to 2 microns.
  • phenolic resin 55 parts of phenolic resin, 10 parts of a copolymer of styrene and maleic anhydride and 5 parts of ethylene glycol dibenzoate (EGDB) were mixed and ground unti particle size of the phenolic resin became 1-3 microns.
  • EGDB ethylene glycol dibenzoate
  • the resulting two components were mixed by stirring and coated on the high temperature color forming layer in 2-5 microns thick (when dried) by a wire bar.
  • the resulting heat sensitive sheet for multicolor formation which is of low adhesivity was subjected to a printing test as mentioned in Example 1 to produce a clear two color formation.
  • Example 2 The high temperature color forming layer as obtained in Example 2 was used.
  • RL Twenty parts of RL and 10 parts of a copolymer of styrene and maleic anhydride were mixed and ground for one hour until particle size of RL became 0.5-2 microns.
  • the resulting two compositions as mentioned above were mixed with stirring and coated on the high temperature color forming layer as obtained above in 2-5 microns thick (when dried) by a wire bar.
  • the resulting heat sensitive sheet had an adhesivity similar to that in Example 3 and was subjected to a printing test in a way similar to Example 1 to produce a clearer and more bluish violet pattern than that obtained in Example 3.
  • RL Twenty parts of RL and 10 parts of a copolymer of styrene and butadiene were mixed and ground for one hour until particle size of RL became 0.5-2 microns.
  • phenolic resin 55 parts of phenolic resin, 10 parts of a copolymer of styrene and butadiene and 5 parts of myristic acid were mixed and ground for one hour until particle size of the phenolic resin became 0.1-5 microns.
  • the resulting two compositions were mixed by stirring and coated on the high temperature color forming layer as obtained above and then subjected to a printing test as in Example 1 to produce a sharp and highly transparent pattern was obtained.
  • Low temperature color formation layer Twenty parts of RL and ten parts of a copolymer of styrene and butadiene were mixed and ground for one hour until particles of RL became 1-2 microns in size.
  • Example 5 The high temperature color forming layer as obtained in Example 5 was used.
  • Example 6 The high temperature color forming layer as obtained in Example 6 was used.
  • the low temperature color forming layer is the low temperature color forming layer.
  • MGL Malachite Green Lactone
  • a copolymer of styrene and maleic anhydride 20 parts were Malachite Green Lactone (MGL) and 10 parts of a copolymer of styrene and maleic anhydride were ground for one hour until MGL particles became 0.5-2 microns in size.
  • parts of a phenolic resin and 10 parts of a copolymer of styrene and maleic anhydride were mixed and ground for one hour until the phenolic resin particles became l-2 microns in size. Then the two above obtained were mixed and coated on a film support (60 microns thick) in 2-5 microns thick (when dried) by a wire bar.
  • Example 1 The low temperature color forming layer as obtained in Example 1 was used. This was coated in 2-5 microns thick (when dried). As the result of printing test by the method of Example 1, two colors, green and violet, were obtained.
  • a printing sheet was prepared in a way similar to Example l.
  • the resulting sheet was subjected to a printing test as in Example 1 to produce blue and bluish green patterns.
  • EXAMPLE 1 l parts of Leuco Auramine (LA) and 10 parts of a copolymer of styrene and butadiene were ground for one hour until LA particles became 0.5-2 microns in size. 60 parts of phenolic resin and 10 parts of a copo1ymer of styrene and butadiene were mixed and ground for one hour until phenol resin particles became 1-2 microns in particle. The two above obtained were mixed and coated in a paper of 60 microns thick in 2-5 microns thick (when dried). Then the high temperature color forming layer as obtained in Example 1 was coated on the above color forming layer and further the low temperature color forming layer as obtained in Example 1 was coated thereon.
  • LA Leuco Auramine
  • 60 parts of phenolic resin and 10 parts of a copo1ymer of styrene and butadiene were mixed and ground for one hour until phenol resin particles became 1-2 microns in particle.
  • the two above obtained were mixed and coated in a
  • Thickness of each layer was the same as that in Example 1.
  • the resulting heat sensitive multicolor recording member was subjected to printing test at a low temperature ranging from 60 to 80C, at a middle temperature ranging from 80 to l 10C, and at a high temperature ranging from 1 10C to 160C to produceclear patterns of red, blue and black, respectively.
  • Example 12 Procedure of Example 1 was repeated except that N- (2,5-dichlorophenyl) leuco auramine was used in place of Crystal Violet Lactone, and printing was effected as in Example 1. As the result, there was obtained printings of black violet and bluish black.
  • EXAMPLE 15 Following the procedure of Example 1 except that 8'-methoxybenzoindolinospiropyran was used in place of Crystal Violet Lactone and B-naphthol was used in place of phenolic resin, there were obtained printings of red and brownish black.
  • a method of recording by heat sensitive multicolor indication which comprises the steps of: providing a heat sensitive recording member for multicolor indication having a plurality of heat sensitive recording layers, wherein each said heat sensitive recording layer contains a material which changes color above a predetermined temperature, and wherein the respective resultant colors and predetermined temperatures are different for each said layer; bringing a heating element into contact with or near to said heat sensitive recording member; and developing a desired color on said recording member by controlling the temperature of the heating element in relation to said predetermined temperatures to change the color of a desired one or more of said layers of the recording member.
  • a method of recording by heat sensitive multicolor indication in which said step of providing said heat sensitive recording member is performed by laminating said layers on a support layer in the order of their respective predetermined temperatures, wherein said predetermined temperatures increase toward said support layer.
  • a method of recording by heat sensitive multicolor indication in which the basic material is selected from the group consisting of diarylphthalides, leuco auramines, acrylauramines, a, B-unsaturated arylketones, basic monoazo dyes, rhodamine B lactams, polyarylcarbinols, benzoindolinospirophyrans, phthalans and spirophthalans.
  • the basic material is selected from the group consisting of diarylphthalides, leuco auramines, acrylauramines, a, B-unsaturated arylketones, basic monoazo dyes, rhodamine B lactams, polyarylcarbinols, benzoindolinospirophyrans, phthalans and spirophthalans.
  • a recording member for providing a heat sensitive multicolor indication which comprises a laminate having at least two heat sensitive recording layers, wherein each said layer contains a material which changes color above a predetermined temperature; and wherein the respective resultant colors and predetermined temperatures are different for each said layer.
  • a recording member for providing a heat sensitive multicolor indication in which said heat sensitive recording layers are laminated on a support layer, and the color forming temperatures of the heat sensitive recording layers increase from the surface side to the support layer side.
  • a recording member for providing a heat sensitive multicolor indication in which the material of at least one said recording layer comprises at least one phenol compound and a color forming material capable of reacting with the phenol compound to form a conjugated system.
  • a recording member for providing a heat sensitive multicolor indication in which the color forming material capable of reacting with the phenol compound to form a conjugated system is selected from the group consisting of diarylphthalides, leuco auramines, acrylauramines, a, B-unsaturated arylketones, basic monoazo dyes, rhodamine B lactams, polyarylcarbinols, benzoindolinospirophyrans,

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Electronic Switches (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
US00270195A 1971-07-13 1972-07-10 Method of recording by heat sensitive multicolor indication Expired - Lifetime US3792481A (en)

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JP5194871A JPS556076B1 (fr) 1971-07-13 1971-07-13

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JP (1) JPS556076B1 (fr)
FR (1) FR2146026A5 (fr)
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NL (1) NL172422C (fr)

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US3901769A (en) * 1973-06-22 1975-08-26 Canon Kk Image recording member
US3905876A (en) * 1972-11-30 1975-09-16 Matsushita Electric Ind Co Ltd Electrorecording sheet
US3924049A (en) * 1973-07-30 1975-12-02 Texas Instruments Inc Multicolor thermosensitive paper
US3934695A (en) * 1974-09-23 1976-01-27 Hewlett-Packard Company Method and apparatus for enhancing and maintaining character quality in thermal printers
US3936361A (en) * 1973-03-26 1976-02-03 Yasushi Takatori Image recording member
US3950600A (en) * 1973-07-27 1976-04-13 Ing. C. Olivetti & C., S.P.A. Thermosensitive element, and its employ in the thermographic reproduction or record systems
US3951757A (en) * 1973-08-17 1976-04-20 Matsushita Electric Industrial Co., Ltd. Process of making electrorecording sheet
US4025399A (en) * 1974-04-08 1977-05-24 Canon Kabushiki Kaisha Image recording member
US4067017A (en) * 1975-11-20 1978-01-03 Michael L. Dertouzos Parallel thermal printer
US4189171A (en) * 1977-03-01 1980-02-19 Sterling Drug Inc. Marking systems containing 3-aryl-3-heterylphthalides and 3,3-bis(heteryl)phthalides
US4255491A (en) * 1978-07-18 1981-03-10 Fuji Photo Film Co., Ltd. Heat-sensitive recording paper
US4283458A (en) * 1978-08-18 1981-08-11 Fuji Photo Film Co., Ltd. Heat-sensitive recording paper containing a novel electron accepting compound
US4388628A (en) * 1980-09-01 1983-06-14 Fuji Xerox Co., Ltd. Multi-color thermal transfer recorder
US4395718A (en) * 1980-09-18 1983-07-26 Fuji Xerox Co., Ltd. Thermal transfer recording medium
US4410897A (en) * 1980-10-17 1983-10-18 Fuji Xerox Co., Ltd. Two-sided recording device
US4427985A (en) 1980-08-29 1984-01-24 Fuji Xerox Co., Ltd. Thermorecording medium, means and process for producing and utilizing same
US4460676A (en) * 1980-02-21 1984-07-17 Fabel Warren M Non-impact single and multi-ply printing method and apparatus
US4660052A (en) * 1986-06-06 1987-04-21 Mitsuhiro Kaiya Heat-sensitive recording apparatus
US4672393A (en) * 1981-11-13 1987-06-09 Canon Kabushiki Kaisha Thermal printer
US4732410A (en) * 1980-12-23 1988-03-22 Gao Gesellschaft Fuer Automation Und Organisation Mbh Identification card and a method of producing same
US4912483A (en) * 1987-10-22 1990-03-27 Graphtec Kabushiki Kaisha Balanced head suspension in thermal recorders
US4916462A (en) * 1987-10-17 1990-04-10 Graphtec Kabushiki Kaisha Reference line setting system for grid pattern recorders
US4928117A (en) * 1987-10-17 1990-05-22 Graphtec Kabushiki Kaisha Thermal printout density control
US5552364A (en) * 1992-03-09 1996-09-03 Ricoh Company, Ltd. Reversible theromosensitive coloring recording method, recording medium and recording apparatus for the recording method
US20090317914A1 (en) * 2006-03-03 2009-12-24 The University Of Tokyo Fluorescent probe
US9234081B2 (en) 2010-06-08 2016-01-12 King Abdulaziz City For Science And Technology Method of manufacturing a nitro blue tetrazolium and polyvinyl butyral based dosimeter film
US9932959B2 (en) 2011-03-10 2018-04-03 King Abdulaziz City For Science And Technology Shrounded wind turbine configuration with nozzle augmented diffuser

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US4151748A (en) * 1977-12-15 1979-05-01 Ncr Corporation Two color thermally sensitive record material system
DE2907004C2 (de) * 1979-02-22 1981-06-25 GAO Gesellschaft für Automation und Organisation mbH, 8000 München Ausweiskarte und Verfahren zu ihrer Herstellung
JPS5888869U (ja) * 1981-12-11 1983-06-16 株式会社セキネ 合成樹脂またはゴム等の弾褥被覆を設けたネツト床の保護構造
IL66445A (en) * 1982-08-02 1985-07-31 Teletoken 2000 Ltd Optically-readable cards
EP3928996A1 (fr) * 2020-06-22 2021-12-29 Agfa Nv Marquage d'objets
EP3928995A1 (fr) * 2020-06-22 2021-12-29 Agfa Nv Marquage d'articles

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JPS4969A (fr) * 1972-04-13 1974-01-05
JPS4970A (fr) * 1972-04-17 1974-01-05
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US3434878A (en) * 1964-10-26 1969-03-25 Hewlett Packard Co Method of forming a multicolor electrosensitive recording medium and article
US3445261A (en) * 1965-10-23 1969-05-20 Ncr Co Heat-sensitive record material
US3364493A (en) * 1966-01-17 1968-01-16 Hughes Aircraft Co Device and method for measurement of laser energy distribution

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905876A (en) * 1972-11-30 1975-09-16 Matsushita Electric Ind Co Ltd Electrorecording sheet
US3936361A (en) * 1973-03-26 1976-02-03 Yasushi Takatori Image recording member
US3901769A (en) * 1973-06-22 1975-08-26 Canon Kk Image recording member
US3950600A (en) * 1973-07-27 1976-04-13 Ing. C. Olivetti & C., S.P.A. Thermosensitive element, and its employ in the thermographic reproduction or record systems
US3924049A (en) * 1973-07-30 1975-12-02 Texas Instruments Inc Multicolor thermosensitive paper
US3951757A (en) * 1973-08-17 1976-04-20 Matsushita Electric Industrial Co., Ltd. Process of making electrorecording sheet
US4025399A (en) * 1974-04-08 1977-05-24 Canon Kabushiki Kaisha Image recording member
US3934695A (en) * 1974-09-23 1976-01-27 Hewlett-Packard Company Method and apparatus for enhancing and maintaining character quality in thermal printers
US4067017A (en) * 1975-11-20 1978-01-03 Michael L. Dertouzos Parallel thermal printer
US4189171A (en) * 1977-03-01 1980-02-19 Sterling Drug Inc. Marking systems containing 3-aryl-3-heterylphthalides and 3,3-bis(heteryl)phthalides
US4255491A (en) * 1978-07-18 1981-03-10 Fuji Photo Film Co., Ltd. Heat-sensitive recording paper
US4283458A (en) * 1978-08-18 1981-08-11 Fuji Photo Film Co., Ltd. Heat-sensitive recording paper containing a novel electron accepting compound
US4460676A (en) * 1980-02-21 1984-07-17 Fabel Warren M Non-impact single and multi-ply printing method and apparatus
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Also Published As

Publication number Publication date
NL172422C (nl) 1983-09-01
JPS556076B1 (fr) 1980-02-13
NL7209693A (fr) 1973-01-16
DE2234314A1 (de) 1973-03-01
DE2234314B2 (de) 1975-11-06
GB1401639A (en) 1975-07-16
FR2146026A5 (fr) 1973-02-23

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