CN1046646A - The thermosensitive receiving medium that is used for fasystem - Google Patents

The thermosensitive receiving medium that is used for fasystem Download PDF

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Publication number
CN1046646A
CN1046646A CN 90102268 CN90102268A CN1046646A CN 1046646 A CN1046646 A CN 1046646A CN 90102268 CN90102268 CN 90102268 CN 90102268 A CN90102268 A CN 90102268A CN 1046646 A CN1046646 A CN 1046646A
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CN
China
Prior art keywords
impression
media
paper
facsimile machine
heat
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Pending
Application number
CN 90102268
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Chinese (zh)
Inventor
杰利·R·伊古尔登
多纳尔德·A·斯特雷克
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Individual
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Individual
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Filing date
Publication date
Priority claimed from US07/341,756 external-priority patent/US5001749A/en
Application filed by Individual filed Critical Individual
Publication of CN1046646A publication Critical patent/CN1046646A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/44Secrecy systems
    • H04N1/4446Hiding of documents or document information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/44Secrecy systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/44Secrecy systems
    • H04N1/4446Hiding of documents or document information
    • H04N1/4453Covering, i.e. concealing from above, or folding

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Credit Cards Or The Like (AREA)
  • Facsimiles In General (AREA)

Abstract

A kind of impression media of using with the standard facsimile machine, it can make an accidental reader can't read seal file thereon.Article one, flexible impression media can receive by the printer of facsimile machine.Impression media has one to receive the surface of image with printer, and removable coverage medium is attached on the limit of impression media so that therewith pass through facsimile machine.Covering medium has one to cover the impression surface of partly covering at impression media, so just makes accidental reader can not read the image that printing machine stamps.The application discloses four embodiment of the plain paper copier that is used for heat-sensitive paper.Also show a kind of scheme that " envelope " just can identify the addressee of not opening.A kind of method that can represent heat-sensitive paper in having the standard facsimile machine of thermal print head with common paper also is provided.

Description

The thermosensitive receiving medium that is used for fasystem
The present invention relates between transmission and receiving terminal, to transmit the fasystem that a file also prevents from will to read without approval this document simultaneously, be particularly related to a kind of impression media, it can stamp image by the printing machine of Common Facsimile Machine and the file that is transmitted is not read by accidental.An attendant advantages of the present invention is can resemble in the facsimile machine in the standard hot stamping to use common paper.
Utilize the mode of faxing to transmit file and have growing trend.The positive aspects of this mode is: fax has fast, accurately and advantages of being cheap, and passive aspect then is: facisimile transmission is as depositing postcard, and promptly on whole transmission link everyone can read the content that transmits file.This problem is excellent when comprising the content that private business or common people should not read in the file that transmits is troublesome.
General correspondence is contained in the envelope and sends to the destination, can put on the printed words of " secret " and so on the envelope, shows that this envelope letter can only be opened by the receiver.But facsimile transmission does not have envelope when arriving the destination.On the file of Chuan Songing a homepage is arranged at most, promptly first page.Can only give recipient's (or any other intermediate between recipient and the sender) prompting putting on " secret " on the homepage, show to have the interested content of the people of making in the file.The unique method of avoiding this careless reading is to utilize the Advise By Wire recipient to be about to pass a classified papers in the past, makes the recipient can go to the facsimile machine front and fetches the file that sends one by one.
Another problem that most facsimile machines exist is to use heat-sensitive paper to reduce machine cost.For so-called " common paper " output can be provided, facsimile machine must be furnished with a complexity and expensive xerography device, like this with regard to make the cost of facsimile machine exceeded most users the scope that can receive.
People also need a kind of safe facsimile transmission system, and its safety of transmission can be controlled by the recipient.
Therefore, the purpose of this invention is to provide a kind of fax receiver media, can stamp the facsimile message that receives by the standard facsimile machine on it, in fact the file that prints off can not read by accidental.
Another object of the present invention provides a kind of safe facsimile transmission system, and wherein safety of transmission can be controlled by the recipient.
A further object of the present invention provides a kind of fax receiver media, and the facsimile message of reception can hot stamping make the quality of the file that prints off examine the same of shellfish or facsimile machine with common paper on medium.
Fig. 1 receives and the sketch map of the file that prints off according to the method for prior art and material, and the information of wherein printing off is easy to be read by accidental reader;
Fig. 2 is the impression process of prior art thermal paper fax machine and the sketch map of material;
Fig. 3 is the impression process of prior art plain paper facsimile and the sketch map of material;
Fig. 4 utilizes the impression process of plain paper facsimile of method of the present invention and material and the sketch map of material;
Fig. 5 utilizes the method for first embodiment of the invention and the heat of material to operate the impression process of facsimile machine and the sketch map of material;
Fig. 6 utilizes the method for second embodiment of the invention and the heat of material to operate the impression process of facsimile machine and the sketch map of material;
Fig. 7 utilizes the method for third embodiment of the invention and the heat of material to operate the impression process of facsimile machine and the sketch map of material;
Fig. 8 is according to a design of the present invention, at a planimetric sketch with the transparent impression media on the back sheet of interference pattern;
Fig. 9 is the situation that is printed on an information on the transparent part of impression media shown in Figure 8, shows from the transparent part interference pattern of seeing over how to make this information not readable concerning an accidental person;
Figure 10 is amplification (disproportionate) the cross section sketch map of the hot stamping safety paper of printable address of the present invention;
Figure 11 is the sketch map that is imprinted on the file on the printable address safety paper;
Figure 12 utilizes computer recipient's identity to be placed the block diagram of the system on the one side that will be sent to the file on the printable address safety paper;
Figure 13 is the cross section sketch map according to the amplification (disproportionate) of the printable address hot stamping safety paper of another available embodiment of the present invention.
At first referring to Fig. 1, Fig. 1 shows according to the method for prior art and material receives and the file 10 of impression, and the information 12 of wherein printing off is easy to be read by accidental reader.As previously mentioned, typically have earlier in the standard facsimile machine at one, the information of printing off 12 among the facsimile machine Fig. 1 that for example can buy on the market can obtain with one of two kinds of methods.As shown in Figure 2, the most frequently used method is to utilize thermal print head 14.According to latest digital, this method account for present use facsimile machine about 75%.Impression media is that a volume has the hot active paper 16 of thermal active coating 18 on it.Along stretching, paper 16 moves in impression in the impression process impression 14 14 time along the Width of paper 16.Impression 14 comprises that a plurality of each heating resistor of heating resistor (not shown) can be heated separately by applying an electric current.When impression 14 resistance in a certain particular pixels position are activated and are heated to threshold temperature, be positioned at coating 18 blackening under the impression head, shown among Fig. 2 20, thereby produce a visible dots.The process of Fig. 3 (very simple form only is shown) takes place in (as in Xerox or a kind of machine that is called laser printer) in plain paper facsimile.Adhere to toner 22 by hyperchromic 24 or similar device on paper 16 at the image that forms on a piece of paper 16 forms.Then, by heating process with toner " fusing " in the surface of paper 16.To describe below and how utilize impression media of the present invention to finish said process, form not readable image.
Referring to Fig. 4, Fig. 4 is for being used for the safe impression media of plain paper facsimile imaging system (system's system as shown in Figure 3).It is totally with 26 expressions.Safe impression media 26 comprises the hyaline layer 28 that can be used for by the safe fasystem of sender's startup.Hyaline layer 28 has a upper epidermis 30, is used to accept hyperchromic image, and makes this image be heat-fused in the bottom that top layer 30 back sheets 32 are attached to hyaline layer 28.Back sheet 32 is preferably papery, and comprises that being coated with the removable thin slice sticky material of sticky material (front was mentioned) is attached to back sheet 32 on the hyaline layer 30, and its method will be discussed in more detail below.Like this, medium 26 can be used as " fax completion " (Fax Over) mark in the safe fasystem that the sender starts, thus the double action of playing.On the upper surface 34 of back sheet 32 interference pattern is arranged, because accidental reader sees image and interference pattern on hyaline layer 28 upper surfaces 30 simultaneously, therefore, jamming pattern has just disturbed the ability of accidental readers ' reading image.Interference pattern is bargraphs preferably, and it can produce a upset factor.As those skilled in the art can understand easily, interference pattern also certain regular figure or with the essentially identical a kind of dark colour of the color of toner 22.In order to see image clearly, need to replace back sheet 32 with a blank sheet of paper, make image on white background, become visual image.
Referring to Fig. 5, Fig. 5 is for being used for the safe impression media of heat active fax imaging system (system as shown in Figure 2).Totally with 26 ' expression.Safe impression media 26 ' still comprise hyaline layer 28 '.In this embodiment, hyaline layer 28 ' upper surface 30 on have one deck thermal active coating 18 ', it can be by the mode of coating 18 on the paper among Fig. 2 16 by hot activation.Therefore, the impression result and the last embodiment of impression 14 are basic identical, just hyaline layer 28 ' upper surface 30 on form black image (i.e. " black " part 20 of Ji Huoing) hyaline layer 28 ' the bottom still have one deck backing paper 32, backing paper 32 still comprises the thin slice that is coated with sticky material.Therefore, medium 26 ' can in sender's startup method, be used as " fax completion " mark, thus realize dual purpose.Still have one deck interference pattern on the upper surface 34 of back sheet 32, so as to influence accidental readers ' reading hyaline layer 28 ' upper surface 30 on the ability of pattern.Just as in the previous embodiments, want to read this image, just must replace back sheet 32, make black pattern on white background, become visual image with a blank sheet of paper.
Fig. 6 and Fig. 7 have demonstrated two kinds of alternative methods and the material that is used for temperature-sensitive impression process shown in Figure 2.Medium 26 at Fig. 6 " in, paper 16 has one deck prior art heat-sensitive layer 18, has one deck to remove on the heat-sensitive layer 18, opaque thin heat transfer medium 36.Heat transfer medium 36 can be translucent or be printed on an interference pattern thereon.The purpose that adds interference pattern is to make unauthorized reader can not see through medium 36 to see the image that produces on the heat-sensitive layer 18 of paper delivery 16 easily.Medium 36 preferably is impregnated with the thin plastics of high metal fine of conductive coefficient or powder (as aluminium).Should be noted that because the impression media that the thermosensitive fax machine usually uses a volume to be cut off by interior dress hobboing cutter the easily broken material that plastic medium preferably can be cut off by hobboing cutter otherwise will block hobboing cutter.Thereby, vertical fast the exciting by medium 36 of heat that when a certain specific pixel location of impression 14 heating, is produced near the pixel on the relevant position of coating 18, thus a visible dots produced in this position (that is, one be excited black region 2020).In this embodiment,, must remove heat transfer medium 36, the following paper 16 that is printed on image is come out in order to see this file clearly.
Medium 26 at Fig. 7 " ' in, a common blank sheet of paper is used as paper 16.Heat transfer printing ink 40 is arranged on the transmission medium 38.Medium 38 is placed on the paper 16.These materials are being known in the art, and are often used as " colour band " of common paper temperature-sensitive printing machine." printing ink " 40 is actually a kind of coloured material based on wax, is untransferable at normal temperatures.But, when being placed on and the used essentially identical temperature of aforesaid activation coating 18 following time, it begin to melt and transfer and consolidation on the surface of paper 16, as 38 places.In printer color tape, medium 36 generally is a thin and nonabradable plastic medium, as polyester film or similar material, and in this application, transmission medium 38 is the low and easily broken material of price preferably, in the present embodiment, as will after impression, seeing file clearly, must remove transmission medium 38 and will play the image on the facial tissue 16 to come out.Except printing ink 40, best (but be not must) adds an additional veil in transmission medium 38.This can be by seal one interference pattern (as previously mentioned, it can comprise a kind of monochromatic color) on the transmission medium 40 relative with printing ink 40.Present embodiment provides an additional benefit, and common paper output promptly can be provided on the standard facsimile machine with temperature-sensitive impression head.Like this, only need with the medium among Fig. 7 26 " ' replace heat-sensitive paper just any thermosensitive fax machine can be become plain paper facsimile.
Referring now to Fig. 8 and Fig. 9 describe in detail with reference to Fig. 4 and Fig. 5 embodiment scheme described have back sheet 32 can finish dual purpose hyaline layer 28,28 '.Hyaline layer 28,28 ' in an one edge sticky material band 44 is arranged at least.Sticky material 44 preferably places top edge (this limit is the leading edge by facsimile machine impression path).If necessary, sticky material 44 can place top edge and lower limb, even every page of the fax paper that therefore received of whole four limits forms real " envelope ".If desired, back sheet 32 can be fixed on whole hyaline layer 28,28 ' surface.For example, can utilize a kind of existing sticky material that can tear easily that a piece of paper is attached to a surface and go up (comprise other a piece of paper), and when tearing this paper, can not damage this surface.Back sheet 32 is attached to the another side of sticky material 42.Like this, alleged " thin slice " in the pending application application 975 of back sheet 32 formation one decks such as the reference of top institute.Back sheet 32 preferably has the horizontal perforation 46 of delegation near sticky material 44, so that can be easily with back sheet 32 separately.Perforation 446 is divided into sclerozone part 48 and shaded portions 50 with back sheet.Preferably have delegation's additional perforation 46 vertical with the length direction of back sheet 32 '.46 ' with 46 segment distances of being separated by, the part that therefore can remove first page is to identify the recipient who issues.When using sticky material to fix all around, vertical perforation is arranged also preferably.Certainly, (as doing according to the courtesy that is suitable in the fax) can be removed whole back sheet 32 to identify the recipient when utilizing Fax cover Sheet.By the way, should be noted that in the embodiment of Fig. 6 and Fig. 7 that paper 16 the most handy stickers are attached on the lid heat transfer medium 36 or transmission medium 38 thereon, so that can easily separate with it along each limit with perforation.In a word, perforation 46,46 ' wait is best to be formed by laser cutting, and this process can easily be separated and can not be produced the working portion that paper scrap enters contiguous electromechanical equipment.As can be seen from Figure, hyaline layer 28,28 ' on can comprise the image the zone under coverage part 50 in contain interference pattern 52.The effect of interference pattern can find out in Fig. 9, wherein by " be now all well-wishers all help they side time " the words of 54 expressions be imprinted on hyaline layer 28,28 ' on.As can be seen from Figure, interference pattern 52 makes the difficult reading of the words, even may not read, and be like this to an accidental beholder at least, this accidental beholder is exactly that the present invention wants excluded that side.
In most preferred embodiment, sclerozone 48 be white so that can be with identical order startup photocopier when photocopier uses double-mode.In addition, the back side of covering part 50 be white so that can provide one to read hyaline layer 28,28 ' the go up required white background of image.In order to utilize most preferred embodiment to read image, remove at perforation 46 places and cover part 50, and the back side of the utilization white that turns over.Then with attachment portion from sticky material 44 peel off (white back that sticky material 44 is used for covering part 50 is attached to hyaline layer 18) 28 ', so that image becomes visible image.
Being used for all embodiment of security purpose advantage of the present invention is at first printed medium to be covered medium in one way, and when removing the coverage medium from impression media, making the file that is imprinted on the impression media is to be read out.
As understandable, the file on the above-mentioned paper of one-man (or some people) reception with identical security interests, the identification recipient is not a subject matter just.File is delivered in recipient's hand, removes homepage then, still, is accurate if do not know the recipient, and such paper will bring inconvenience.If follow the fax courtesy of standard, every part of file (one page or multipage) all will have a dated recipient's homepage.In this case, only need remove the cover layer of homepage with regard to who is the recipient as can be known.When not using homepage, the personnel of receiving terminal must be especially careful, and only can remove that part of relevant with definite recipient of homepage cover layer.
In many cases, receiving terminal is wished to open anything (partly or entirely) and just can be known the recipient.For example, many hotels provide the service of fax sending and receiving for its guest.For guest's secret needs, they wish to use above-mentioned paper.Yet they are more wished and can identify the recipient from the outside of " envelope " as standard mail for convenient and assurance are perfectly safe.To illustrate below and how realize above-mentioned purpose according to the present invention.
Illustrated among Figure 10 can write according to the present invention this characteristic of recipient the sectional drawing at an edge of improved the above-mentioned type temperature-sensitive safety paper, paper is by 110 ' expression.Should be specifically noted that this figure is out-of-proportion.Wherein, used coating amplified especially so that paper 110 ' structure easy to understand and more clear more.Paper 110 ' the comprise cover layer 114 on the substrate 11112 that places paper.Cover layer 114 the most handy stickers 103 are attached on the substrate 112 of paper along periphery.124 places near the edge of adhesive agent 130 on cover layer 114 have perforation, and are so that place the core of the cover layer 114 on the content 128 of file 126 can be by fast, convenient and remove neatly.Scribble the printing ink 116 that can conduct heat at cover layer 114 on the one side of substrate 112, this is the same with aforementioned common paper.Yet, just printing ink is arranged 124 of perforations.The used material of thermal fax paper that a thermo-sensitive material 132(such as prior art are arranged on the another side of cover layer 114 (promptly)) coated tape.Certainly, an also available material band that separates.But, only inking 116 and thermo-sensitive material 132 respectively in the relevant position on the two sides of cover layer 114, then utilize sticker 130 around coating cover layer 114 and paper substrates 112 are fixed together, just can simplify production process greatly.For paper 110 that even rolling is provided to a roller ', thermo-sensitive material band 132 is preferably arranged along two edges, the thickness of thermo-sensitive material 132 coatings preferably and the thickness basically identical of ink coating 116.
As shown in figure 11, if indicate the addressee along the edge of original, the addressee of original partly be imprinted on the addressee subscript in view of this this mark mirror by thermo-sensitive material band 132 be formed on paper 110 110 ' the edge on.
Available hand-written or typewriter (side of file is inserted typewriter) adds the addressee at the edge of file, as shown in figure 12, also available computers the paper that will pass to present embodiment 110 that computer is set up ' on file on add addressee's part.In computer 134, a start program 136(is as a word processor) receive input from keyboard 138, and in memory 140, set up one will be by printer 142 typescripts.Fail-safe software 144 also receives the addressee information from keyboard.And utilize this information revised file 126, arrange addressee information as described in Figure 11 along the edge.Amended file 126 then is printed machine 142 and prints, and is sent by facsimile machine.The software 144 of taking care is preferably laterally settled addressee informations along two edges of file, optimizes paper 110 ' have herein hot coating 132.If desired, fail-safe software 144 not only can stamp addressee information on first page of file that plurality of sheets of paper constitutes, also can calculate the number of pages of file 126 in the memory 140, and suitable number of pages information is imprinted on each page with addressee information.For example, the information that can comprise " the 2nd page, totally 4 pages " on certain one page for a secure file that mixes with other file, can be told its each page as the part of addressee information so very fast and at an easy rate.
At last, as shown in figure 13, under the situation of above-mentioned temperature-sensitive safety facsimile transmission paper, if homepage comprises a Heat Conduction Material, can transfer heat to one as paper substrates and have on the standard heat-sensitive paper of thermo-sensitive material, then homepage is transparent, and does not have interference pattern along the edge, like this, just can directly see addressee information.If can not do like this, then best bet is exactly the same with said method, at the upper surface of the Heat Conduction Material of homepage, lays a thermo-sensitive material band along the edge.

Claims (8)

1, the impression media that is used for fasystem, fasystem is sent to receiving terminal with facsimile machine with a file from making a start whereby, and by the temperature-sensitive impression head of receiving terminal facsimile machine file is printed off this medium and be characterised in that:
A) facsimile machine is receivable in order to the flexible impression media band by facsimile machine impression head, and this impression media has one and is used for receiving visual impression surface with the impression head,
B) mist covers at the lip-deep overwrite media band of above-mentioned impression media, and by facsimile machine, above-mentioned topped medium has one to cover part with above-mentioned printed medium for it, and this coverage is partly covered on above-mentioned impression media.Printer prints pattern on this impression media.Even described coverage part comprises that the impression head produces heat with the device on the relevant position that this pattern is imprinted on described impression surface at position of image.
2, the impression media of claim 1 is characterized in that:
A) described impression media is a heat-sensitive paper, and it is the coating of dark visible color with thermal change that one deck is arranged on its upper surface;
B) described overwrite media is to cover this cover layer of a cover layer on the described upper surface of described heat-sensitive paper to have high thermal conductivity and heat vertically can be passed on the coating of described heat-sensitive paper by aforementioned topped medium rapidly from the impression head, described cover layer is a kind of easily broken material, thereby described cover layer can be by the cut-out of the horizontal cutting knife of facsimile machine.This kind cutting knife can be cut into Len req with becoming coil paper.
3, the impression media of claim 1 is characterized in that:
A) described impression media is a common paper with upper surface;
B) described overwrite media is the cover layer that covers at the described upper surface of above-mentioned common paper, (relative with the upper surface of above-mentioned common paper) has a heat transfer ink coating on this layer lower surface, thereby, when printer is added to heat on the described topped medium, transfer to the upper surface of common paper from described overwrite media near the printing ink at this place, described cover layer is the easily broken material of one deck, thereby described cover layer can be cut off by the horizontal cutting knife of facsimile machine.This kind cutting knife can will become coil paper to be cut into Len req.
4, the impression media of claim 1 is characterized in that,
Be laid on the sideband of the above-mentioned topped dielectric surface relative with above-mentioned print surface.
Described material is a kind of thermal print head when facsimile machine can become dark visible color when heating on a certain pixel a material, and then addressee information can be imprinted on the described cladding material and need not put overwrite media from described impression media and just can see.
5, the impression media of claim 4 is characterized in that:
Described thermo-sensitive material coating be laid near on two bands of described overwrite media dual-side like this, impression media is involved in one equably and supplies with volume.
6, the impression media of claim 3 is characterized in that:
One deck heat-sensitive material layer, putting near a band of a side of described overwrite media with described impression layer facing surfaces upper edge, described material is the material that a kind of thermal print head when facsimile machine can become dark visible color when heating at a certain pixel place, thereby, addressee information can be imprinted on the described overwrite media and can be not put overwrite media from impression media just can be seen that described heat-sensitive material layer is laid and place near on two bands of described overwrite media dual-side, the thickness of described heat-sensitive material layer and heat transfer ink lay is basic identical, thereby impression media can be involved in a supply volume equably.
7, the impression media of claim 1 is characterized in that:
Described coverage material also is included in the device of setting up interference pattern on the described impression surface, and when watching the lip-deep image of impression with interference pattern, accidental reader can't read image.
8, the device of claim 7 is characterized in that:
Described interference pattern comprises a lip-deep pattern that is imprinted on described overwrite media.
CN 90102268 1989-04-21 1990-04-20 The thermosensitive receiving medium that is used for fasystem Pending CN1046646A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US07/341,756 1989-04-21
US07/341,756 US5001749A (en) 1988-03-31 1989-04-21 Thermally-activated receiving medium for use in a facsimile transmission system
US35480289A 1989-05-22 1989-05-22
US07/354,802 1989-05-22

Publications (1)

Publication Number Publication Date
CN1046646A true CN1046646A (en) 1990-10-31

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CN 90102268 Pending CN1046646A (en) 1989-04-21 1990-04-20 The thermosensitive receiving medium that is used for fasystem

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EP (1) EP0469078A1 (en)
JP (1) JPH04505238A (en)
CN (1) CN1046646A (en)
AU (1) AU5536190A (en)
CA (1) CA2050938A1 (en)
CS (1) CS194890A2 (en)
WO (1) WO1990013201A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04207267A (en) * 1990-11-28 1992-07-29 Challange Five:Kk Shielding sheet of information recording paper, such as recording paper for facsimile and method for shielding information recording paper by using the shielding sheet

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4596991A (en) * 1984-12-24 1986-06-24 Polaroid Corporation Thermal recording medium and method
DE3506828A1 (en) * 1985-02-27 1986-08-28 Buchmann Rudolf Ch METHOD FOR ENSURING CONFIDENTIALITY AND ITS APPLICATIONS REQUIRED FOR PROTECTED TREATMENT OF INFORMATION DOCUMENTS TO BE HANDLED IN TELEMATICS COMMUNICATION
EP0260815A1 (en) * 1986-08-18 1988-03-23 Spectron Print Pty. Limited Secure encoding method and associated products
FR2609343A1 (en) * 1987-01-07 1988-07-08 Mohammad Karim Device making it possible to reveal numbers, letters or figures which are not apparent at first sight.

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WO1990013201A1 (en) 1990-11-01
CA2050938A1 (en) 1990-10-22
JPH04505238A (en) 1992-09-10
CS194890A2 (en) 1991-09-15
AU5536190A (en) 1990-11-16
EP0469078A1 (en) 1992-02-05

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