Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
  • G03G5/02—Charge-receiving layers
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
  • G03G5/02—Charge-receiving layers
  • G03G5/028—Layers in which after being exposed to heat patterns electrically conductive patterns are formed in the layers, e.g. for thermoxerography

Definitions

• the present invention provides a method of and material for recording and reproducing information.
• the method according to the invention comprises deforming, thicknesswise, a recording material of which at least part of the thickness, from its surface, is formed by a continuous phase of a deformable insulating matter which is laden, in direct contact therewith, with electricity conductive particles, in homogeneous dispersion, so as produce, by varying the distance between the conductive particles, regions of different conductivity defining an image corresponding to the information to be recorded, and developing the thus defined image into visible form.
• conductive particles use can be made of both metallic particles and non-metallic conductive particles, for example particles of graphite and particles of conductive metallic oxides.
• metallic particles use can be made of particles of metals or of alloys, for instance highly conductive metals such as copper, iron, nickel, silver and aluminium.
• the shape of these conductive particles can be regular, e.g. spherical or oval, or be irregular (fragments produced by grinding larger pieces).
• These particles may consist of a conductive or non-conductive, porous or compact, core of which the surface is coated with conductive matter and of which the pores, if any, may contain conductive matter.
• the grain size of these particles preferably lies between 0.1 and 100 microns.
• This grain size is preferably uniform whereby the electric conductivity of the material in the initial state (before use) of the latter may be homogeneous.
• the concentration of conductive particles in the dispersion preferably lies between 10 and 80% by volume.
• the concentration of the conductive particles in the deformable insulating matter, the conductivity, the size, the shape of these particles and the resistivity of the insulating matter are preferably so chosen that there may be obtained a variation in the conductivity of the material in a ratio of at least 10 by varying the thickness of the material whereby an image having a good contrast and possibly a gradation of the intensity of the various parts of the image may 'be obtained.
• the absolute value of the initial resistivity and of the final resistivity of the material is chosen in dependence on the way the latter is to be used and on the method by which the resulting latent image is developed.
• material intended for electrostatic development preferably has an initial resistivity of the order of 10 ohm.cm. and and a final resistivity, in its most resistive parts, of at least 10 ohm.cm. Preferably, this latter resistivity is even of the order of 10 ohm.cm.
• Material intended for electrolytic development preferably has an initial resistivity of the order of for example 10 ohm.cm. and a final maximum resistivity of the order of 10 to 10 ohm.cm.
• the greater the resistivity variation through deformation of the material the better will be the contrast and the intensity gradation that can be obtained.
• the absolute value of the resistivity of the conductive particles use is preferably made of particles of matters having resistivities ranging for example from about 10- ohm.cm. to about 10" ohm.cm. As for the corresponding values for the deformable matter, they range for example from 10 to 10 ohm.cm.
• the insulating matter may be deformed under the action of pressure or as a result of a change in temperature.
• This matter may for example have the structure of a foam with open or closed cells, or a fibrous structure, these two structures being deformable either by compression or by heating. It may also contain small gas bubbles homogeously distributed in its mass or, in the case where it has a closed cell foam structure, it may contain a gas inside the cells.
• the insulating matter may also be in its initial state (before being subjected to the action of mechanical stresses caused by a tension applied while being formed, e.g., while being put into sheet form). In this case, these stresses may be interrupted by heating thereby causing a variation in the volume of the insulating matter. Material containing deformable insulating matter of this type is for example described in US. patent specification No. 3,223,526.
• the insulating matter may also contain, in homogeneous dispersion or in solution form, at least one swelling agent consisting of a substance or a mixture of substances capable of giving off at least one gas under the action of heating above a certain temperature.
• the swelling agent is preferably so chosen that this temperature will be higher than the ambient temperature.
• swelling agent use can for example be made of one of the swelling agents described in the following publications:
• mula R-N in which the R group is an aryl or heterocyclic group, or a group of formula R CO-- or R -SO R and R themselves being aryl or heterocyclic groups.
• Use can also be made by way of swelling agent of a diazonium salt, a diazo-oxide or a diazosulphonate.
• Another example of the swelling agent that can be used is N,N'-dimethyl-N,N-dinitroso-terephthalamide whose decomposition temperature is '98 C.
• the swelling agent may be so chosen that it only acquires its property of giving off gas after having been sensitized or activated by irradiation with an actinic radiant action (electromagnetic waves capable of producing or of initiating chemical reactions including the most energetic part of the spectrum, i.e., radiations lying between the green part of the visible spectrum and the gamma rays).
• an actinic radiant action electromagnettic waves capable of producing or of initiating chemical reactions including the most energetic part of the spectrum, i.e., radiations lying between the green part of the visible spectrum and the gamma rays.
• an actinic radiant action electromagnetic waves capable of producing or of initiating chemical reactions including the most energetic part of the spectrum, i.e., radiations lying between the green part of the visible spectrum and the gamma rays.
• an actinic radiant action electromagnetic waves capable of producing or of initiating chemical reactions including the most energetic part of the spectrum, i.e., radiations lying between the green part of the visible spectrum and the gam
• the deformation of the insulating matter can be either reversible or permanent depending on the nature of the latter, in particular on whether it is elastic or not. This deformation may mainly be due either to the deformation of the insulating matter as such or to the expansion of the gas that may be trapped within the substance.
• the chemical composition of the deformable insulating matter may vary widely.
• This matter may consist of a thermoplastic polymer, e.g. a polyolefine, a polyvinyl resin, a polyacrylic or polymethacrylic resin, a polyamide, etc., of a thermosetting polymer, e.g. an epoxy resin, a polyester, etc., of an elastomer, e.g. a natural rubber, a synthetic rubber (polydiene), etc., of an elastic or rigid polyurethane foam with open or closed cells.
• the deformable insulating matter may also consist of a mixture of different substances and it may have a homogeneous or heterogeneous structure. For example, it may simultaneously comprise fibres and a foam to form a heterogeneous deformable structure.
• the deformable insulating matter may be transparent, translucid or opaque to visible light and/or other electromagnetic radiations. It may contain in dispersion form, besides the conductive particles, opacifying or coloring agents, or particles of substances having a large heat absorbtion capacity and hence able to amplif the elfect of the heat.
• the entire thickness of the material or only part of this thickness may be formed by the deformable matter.
• the remainder of the thickness of the material may be formed by a support of which at least that part which is in contact with the conductive deformable matter is itself conductive.
• This support may, for example, consist of a sheet of paper coated with a thin conductive layer, e.g. aluminum foil, in contact with the conductive deformable matter.
• the conductive layer of the support may be used as an electrode during development of the image, since it forms an integral part of the actual recording material.
• the layer of insulating matter may be applied to the support not only in the form of a continuous layer but also in the form of a discontinuous layer made up of strips, dots, smudges, etc., whether evenly distributed or not, the thickness of this discontinuous layer being however the same throughout in the initial state of the material.
• the advantage of so dividing the layer is to avoid the phenomenon of tint weakening, at the center of layer regions having a large area, during electrostatic development, this well-known phenomenon being caused by a preferential accumulation of electric charges at the periphery of such regions.
• the thickness of the deformable insulating part of the material preferably ranges from 5 to 500 microns.
• the thickness of the support if any, also ranges from 5 to 500 microns and depends on the way the material is to be used and on the required mechanical strength.
• the material can for example have a generally flat shape, for instance in the form of flexible or rigid sheets, of strips, and of sheets woundover the outer or inner surface of a cylindrical drum.
• the material may also be in the form of a filament, of a flexible or rigid rod or bar of circular, oval or polygonal crosssection, etc.
• the image is defined by exerting on the support a suflicient pressure to cause a deformation which results in a conductivity variation enabling the subsequent development of the image.
• a clich in relief of the desired image may be used.
• infra-red radiant source for instance an infra-red radiant source of a common type (called infra-red flash lamp) capable of emitting high-power radiation of for example 500 to 2000 watts in the form of an emission of short duration, e.g. of 1000 microseconds with a maximum intensity peak lasting microseconds.
• infra-red flash lamp capable of emitting high-power radiation of for example 500 to 2000 watts in the form of an emission of short duration, e.g. of 1000 microseconds with a maximum intensity peak lasting microseconds.
• the procedure may be similar to the so-called flash thermography method, as described for example in British patent specification No.
• the heating operation may be performed by transferring, into the particle laden insulating matter, the heat accumulated in regions that absorb the infra-red radiations of an image formed on an original document maintained in thermo-conductive contact with the material during irradiation of this document with radiations at least mostly made up of infra-red rays.
• This can take place either by transmission or by reflection.
• the latter method is of particular advantage for making reproductions from thick documents, e.g. pages of books.
• the material can also be heated by the absorption of radiations, e.g. infra-red or visible radiations, in at least one substance contained in the material and by the transformation into heat of at least part of the energy from these radiations.
• radiations e.g. infra-red or visible radiations
• a mask defining the image on the surface of the material may for example be placed between the radiant source and the material.
• the image may for example be defined on the surface of the material in the following way:
• an activating radiations source preferably a radiant source consisting at least to a major extent of ultra-violet radiations, and the material
• a mask defining the image on the surface thereof.
• the parts that are not covered by the mask are irradiated with activating radiations so as to define the image in a latent form on the surface of the insulating matter.
• This surface is then heated, either before or after removing the mask, so as to deform those parts that are not or were not covered by the mask.
• the preferred form of heat source for carrying out this latter operation is an infra-red flash lamp, e.g. a lamp having the above indicated characteristics.
• the material used for carrying out the above described method may be employed either as a definitive document or as an intermediate document, i.e. as a master.
• the master may be used to produce several definitive documents (copies) or to produce one or more further masters.
• the material may resume its initial shape, once an image has been recorded in a visible (developed) form or in an invisible (latent image) form and this image has been transferred on to another master, thus enabling this same material to be re-used for recording new information.
• EXAMPLE 2 A recording material is prepared, similar to that of Example 1 but comprising, in addition to the copolymer sheet laden with copper particles, an aluminium sheet 15 microns thick with one side thereof lined with the copolymer sheet.
• the procedure for preparing this material is the same as that for preparing the material according to Example 1, the only difference being that the dispersion of copper in the copolymer is poured onto an aluminium sheet 15 microns thick instead of being poured directly onto the plate and that the sheet is left adhering to the aluminium sheet after evaporation of the xylene.
• the material according to this example is used in the same way as that according to Example 1, but with the aluminium sheet acting as the electrode during electrolytic development of the signs recorded on the deformable surface of the material.
• EXAMPLE 3 Using the procedure of Example 1, a recording material is prepared consisting of a sheet having an initial thickness (before use) of 60 microns, laden with the same copper powder as that employed in Example 1, in the form of a suspension containing 10% by volume of cop per, but using, by way of deformable insulating matter, a copolymer of polyvinyl-toluene and of polybutadiene having a resistivity of 3.3 10 ohm.cm.
• the entiresurface of the material is subjected to a corona discharge, by scanning in a plane parallel to the surface of the material, with the aid of four tungsten wires 10 microns thick which lie parallel to each other and which are also kept parallel to the material, at a distance of 1 cm. from the surface of the latter, there being applied between these wires and the material a potential difference of kv.
• the thus created electrostatic latent image is made visible by flowing a mixture of toner powder (Rank-Xerox 04/E/007), having a grain size of the order of 5 microns, and of glass micropellets having a diameter of the order of 0.5 to 1 mm., over the surface of the material, when placed in an inclined position.
• toner powder Rank-Xerox 04/E/007
• glass micropellets having a diameter of the order of 0.5 to 1 mm.
• the toner powder remains fixed by electrostatic attraction to the charged parts of the material and the letters thus become visible, by appearing with a copper coloring (the original colouring of the material) in a background having the coloring of the toner.
• the image which has thus been made visible is fixed to the material as such by uniformly heating, with the aid of an infra-red ray lamp, the surface in such a way as to the melt on the surface the toner particles.
• EXAMPLE 4 The procedure is as set forth in Example 3 but instead of fixing the image on the actual material, the toner powder is transferred by adhesion on to a definitive document. After this transfer, powder is again electrostatically applied on the material and the powder is transferred on to a definitive document. This cycle is repeated several times so that a practically unlimited number of copies can be made of 'the text that is recorded on the material.
• EXAMPLE 5 The procedure is as set forth in Examples 3 and 4, using the material several times as a duplicating master, but the transfer of the image from the initial material to the definitive documents is done by applying an electric field between the material and the supports of the definitive documents.
• EXAMPLE 6 The procedure is as set forth in Examples 3, 4 and 5 using for the material a material comprising an aluminum sheet 15 microns thick on one side thereof, this aluminium sheet acting as an electrode during the corona discharge and during the subsequent transfer of the image by electrostatic attraction.
• EXAMPLE 7 In a manner similar to that described in Example 2, a recording material is prepared consisting of an aluminium sheet 15 microns thick which is coated on one of its sides, at a temperature of 20 C., with a layer microns thick of a suspension containing 20% by volume of tungsten powder (made up of spherical particles having a homogeneous grain size very close to 2 microns) in a copolymer of polyacrylic resin and of polysteyrene known in the trade under the name of Pliolite AC and made by Goodyear Tire and Rubber Company.
• tungsten powder made up of spherical particles having a homogeneous grain size very close to 2 microns
• Pliolite AC copolymer of polyacrylic resin and of polysteyrene known in the trade under the name of Pliolite AC and made by Goodyear Tire and Rubber Company.
• Pliolite AC a 30% by weight solution of Pliolite AC in xylene.
• Pliolite AC has the following physical and electrical properties:
• N,N'dimethyl-N,N'dinitroso-terephthalimide which is a compound that decomposes when heated to a temperature of 98 C. by giving off nitrogen and which acts as a swelling agent for the dispersion layer.
• a mask formed by a stencil bearing a text made by perforating with a typewriter a suitable support that is highly resistant to heat.
• the material is irradiated for 30 seconds, with the infra-red lamp being kept at a distance such from the material that the temperature of that part of its sruface which is exposed to the radiant action be raised to C., the remainder of this surface remaining at a temperature of less than 40 C.
• the parts of the material that are exposed to the radiant action swell thicknesswise in an irreversible manner and come to have a thickness of 250 microns. Their resistivity is then 10 ohm.cm.
• the unexposed parts of the material retain their original thickness and resistivity, i.e. 80 microns and 2.5 X 10 ohm.cm.
• the image can be made to appear on the surface of the actual material and with others the image can be transferred in visible or invisible (latent image) form from the surface of the material to that of another material whichmay be termed receiving material or auxiliary support.
• This receiving material may -'be paper, either special or ordinary.
• One method enabling the image to appear on the surface of the actual material consists in charging the surface of the material, on the insulating matter side, with positive or negative electrostatic charges, at a density which is an inverse function of the conductivity of the material.
• any known means may be resorted to, e.g. a corona discharge device.
• the latent'image that consists of regions of different conductivity is thus transformed into a corresponding latent image consisting of regions that are electrostatically charged at the surface.
• the image can then be made visible by the so-called cascade method which consists in sprinkling the surface of the material with a powder which has been electrostatically charged by triboelectric friction and which is made up of two kinds of particles, i.e.
• the toner a black or colored powder whose tint or coloring contrasts with the initial tint or coloring of the material
• the carrier a coarser grained powder which serves to generate the electrostatic charges of the toner.
• the toner and the carrier are so chosen that the toner acquires a charge of opposite sign to that of the charge of the material so that the toner particles are selectively attracted by the charged regions of the image, with the density of the particles corresponding to that of the charge of the various regions.
• the toner can also be deposited on the charged regions of the material by other known methods, for instance those which are also described in the above mentioned document e.g. the brushing method (fur brush or magnetic brush), the impression method with a mohair roller, the method involving the production of a cloud of powder, the method involving the production of an aerosol of charged liquid droplets, and the electrophoresis method.
• a powder having a coloring which contrasts with that of the dispersion without first charging the surface of the material, i.e. by directly using the latent image consisting of regions of different conductivity.
• This may for instance be done by electrolysis of a suitable substance, e.g. an aqueous solution of one or more metal salts having colored ions having a suitable coloring, with the cathode being formed by the material carrying the latent image consisting of regions of different conductivity.
• a suitable substance e.g. an aqueous solution of one or more metal salts having colored ions having a suitable coloring
• Another way is by electrophoresis of a suspension of charged black or colored particles with the material being used as the electrode of opposite sign to that of the charge in the particles. In both cases, the ions and the charged particles are selectively attracted by the most conductive regions of the image and discharge themselves on these regions.
• the fixing of the image can be done in the above indicated manner.
• One method for transferring the image from the surface of the material to that of another material for example consists in first developing the image on the material as such in the form of a deposit of black or colored powder or particles, by one of the above described methods, but Without fixing the powder, and in then transferring by contact, with the use of an adhesive, and/or by electrostatic attraction, at least part of this powder in the form of an image on the receiving material.
• a recording material consisting of a sheet of copoly mer of polyvinyltoluene and of acrylic resin (resistivity of the copolymer: 6.3 l0 0hm.cm) 45 microns thick and containing 50% by volume of copper in the form of a homogeneous dispersion of copper particles, is prepared as follows:
• Mean particle size (in microns) IQUIAUMUI The resulting dispersion is spread on a plate to form a film and the xylene is left to evaporate to produce a flexible sheet having suflicient mechanical strength to enable it to be detached from the surface of the plate.
• the transverse electric resistivity of this sheet is 1.1)(10 ohm.cm.
• Letters are then recorded on this material by striking thereon characters with an ordinary typewriter.
• the characters With a normal striking force of the typewriter, the characters form recessed marks on the material which retains a permanent deformation corresponding to a mean thickness of 20 microns at the bottom of the marks.
• the corresponding transverse resistivity amounts to 25x10 ohm. cm.
• resistivity variation having a factor of 10 between the deformed parts and the nondeformed parts of the material.
• the letters inscribed in recessed form are then electrolytically developed as follows: the sheet of recording material bearing the impressed marks of the characters is pressed gently and uniformly between two flat nickel electrodes of an electroplating apparatus after having applied a sheet of galvanoplastic paper inbibed with an electroplating solution called black nickel having a pH lying between 6.6 and 6.9 (composition of this solution, for 20 litres of solution: ammoniacal nickel sulphate, 2 kg. dissolved in 7 litres of distilled water; ammonium sulphate solution,
• a recording material is prepared, consisting of a sheet of aluminium 15 microns thick which is coated on one side thereof at a temperature of 20 C. with a layer 80 microns thick of a suspension containing 15% by volume of the same copper powder as that employed in Examples 1 and 3, in Pliolite AC which suspension also contains a 5% by weight dispersion of N,N-dimethyl-N,N'- dinitroso-terephthalamide.
• the image of a text is recorded on this material in the same way as in Example 7 but so regulating the irradiating conditions that the temperature of the exposed parts of the surface of the material may be raised to 140 C., and kept at that value for 30 seconds, the shielded parts remaining at a temperature of less than 40 C. Between the exposed parts and the unexposed parts, there is thus obtained an electrostatic contrast of 700 volts, with a residual potential of 200 volts for the unexposed parts, as a result of the swelling of the exposed parts which come to have a thickness of 280 microns whereas the unexposed parts retain their original thickness of 80 microns.
• EXAMPLE 9 The procedure is as set forth in Example 8 but instead of fixing the image of the text on the actual material, it is transferred by adhesion on to a definitive document as in Example 4
• EXAMPLE 10 The procedure is as set forth in Example 8 but instead of fixing the image of the text on the actual material, it is transferred electrostatically on to a definitive document as in Example 5.
• conductive support an aluminium sheet 15 microns thick deformable layer, in the direction of its thickness (original thickness 80 microns): a 15% by volume suspension of nickel powder (2-3 micron grain size) in Pliolite AC swelling agent: (N,N'-dimethylamino)-p-diazobenzene fluoroborate (made by Gevaert and known in the trade under the name of Diazo 69) (in a 10% by weight suspension in Pliolite AC) (decomposition temperature of this swelling agent: 108 C.).
• Pliolite AC swelling agent N,N'-dimethylamino)-p-diazobenzene fluoroborate (made by Gevaert and known in the trade under the name of Diazo 69) (in a 10% by weight suspension in Pliolite AC) (decomposition temperature of this swelling agent: 108 C.).
• the deformable layer For the preparation of the deformable layer use is made of a 30% by weight solution of Pliolite AC in xylene, the solution also containing the swelling agent.
• the nickel powder is mixed with this solution and is dispersed therein with an ultra-sonic agitator.
• the image of a text typewritten with black ink on translucid paper is recorded on this material by inserting this text between the material and an ultra-violet ray emitting lamp (a 125 w. mercury vapour lamp whose emission spectrum has intensity peaks for the following wavelengths: 2805, 2884, 2968, 3025, 3129, 3342, 3658, 4062, 4353, 5461, 5780 and 6924 Angstrom). After exposure, the material is uniformly heated by putting it in contact for 5 minutes with a hot metallic plate having a temperature of 105 C.
• an ultra-violet ray emitting lamp a 125 w. mercury vapour lamp whose emission spectrum has intensity peaks for the following wavelengths: 2805, 2884, 2968, 3025, 3129, 3342, 3658, 4062, 4353, 5461, 5780 and 6924 Angstrom.
• EXAMPLE 12 A recording material is prepared in the same way as in Example 11, with the following characteristics:
• conductive support an aluminium sheet 15 microns thick deformable layer (original thickness of 60 microns): a 1.5% by volume suspension of nickel powder (identical to that used in Example 11) in Pliolite AC swelling agent: N,N-dimethyl-N,N-dinitroso-terephthalamide, in 5% by weight dispersion in the acrylic resin polymer.
• the image of a text printed in black on a white background is recorded on this material by placing the latter on the text and by irradiating the free surface of the material with infra-red rays emitted by the same lamp as in Example 7.
• the latent image of the text is formed by refiection, the black parts of the document absorbing more radiant energy and reaching a temperature greater than that of the white parts. After three seconds of irradiation, the thickness of the parts of the material overlying the black parts of the document reaches microns whereas the parts of the material overlying the white parts retain their original thickness of 60 microns.
• the resulting electrostatic contrast is 300 volts with a residual potential of 100 volts for the parts of the material that have not swollen.
• the image of the text is developed electrostatically and is fixed on the material in the manner described in Example 3.
• EXAMPLE 13 The procedure is as set forth in Example 12 but instead of fixing the image of the text on the actual material, it is transferred by adhesion onto a definitive document in a manner similar to that described in Example 4.
• EXAMPLE 14 The procedure is as set forth in Example 12 but instead of fixing the image of the text on the actual material, it is transferred electrostatically onto a definitive document in a manner similar to that described in Example 5.
• EXAMPLE 15 A recording material is prepared in a manner similar to that described in Example 2, with the following characteristics:
• conductive support an aluminium sheet 15 microns thick deformable layer (original thickness of microns): a suspension containing 5% by volume of copper powder identical to that described in Example 1 and 55% by volume of talcum powder (1 micron grain size) in a copolymer of acrylic resin and of polystyrene, having a resistivity of 1.5 10 ohm.cm. and a viscous transition temperature of 60 C. (a product known in the trade under the name of Pliolite AC and made by Goodyear Tire and Rubber Company).
• a type written text is recorded on this material by a striking action with an instantaneous pressure of 2 kg./ mmfi. At the bottom of the recessed marks, the thickness of the material is 70 microns. There is thus obtained an electrostatic contrast of 450 volts with a residual potential of 200 volts.
• a method of recording and reproducing information which comprises (a) imagewise exposing to activating radiation a recording material at least part of the thickness of which,
• a deformable insulating organic polymeric material which is laden in direct contact therewith, with electrically conductive particles, homogeneously dispersed in said insulating organic polymeric material, said material also containing at least one substance capable of giving ofi at least one gas under irradiation with activating radiation, to form a latent image thereon,
• said activating radiation consists, at least in major part, of ultraviolet radiations.
• a method according to claim 2 which comprises inserting a mask between a source of ultraviolet radiation and said recording material to imagewise expose said recording material to form a latent image thereon.
• a method according to claim 1 which comprises transferring the electrostatic charge image onto a receiving material, and developing the electrostatic charge image on said receiving material.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Printing Methods (AREA)
• Photoreceptors In Electrophotography (AREA)
• Thermal Transfer Or Thermal Recording In General (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=4348878

Family Applications (1)

Country Status (7)

• 1970
  • 1970-06-17 CH CH915070A patent/CH526821A/fr not_active IP Right Cessation
• 1971
  • 1971-06-11 DE DE19712130056 patent/DE2130056A1/de active Pending
  • 1971-06-16 US US00153809A patent/US3806353A/en not_active Expired - Lifetime
  • 1971-06-16 GB GB2829371A patent/GB1354768A/en not_active Expired
  • 1971-06-16 CA CA115,858*7A patent/CA952968A/en not_active Expired
  • 1971-06-17 BE BE768660A patent/BE768660A/fr unknown
  • 1971-06-17 FR FR7121974A patent/FR2099144A5/fr not_active Expired

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