US2500617A - Electrosensitive stencil blank - Google Patents

Electrosensitive stencil blank Download PDF

Info

Publication number
US2500617A
US2500617A US453604A US45360442A US2500617A US 2500617 A US2500617 A US 2500617A US 453604 A US453604 A US 453604A US 45360442 A US45360442 A US 45360442A US 2500617 A US2500617 A US 2500617A
Authority
US
United States
Prior art keywords
stencil
sheet
recording
stylus
impregnation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US453604A
Other languages
English (en)
Inventor
Return J Meigs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Western Union Telegraph Co
Original Assignee
Western Union Telegraph Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE474200D priority Critical patent/BE474200A/xx
Application filed by Western Union Telegraph Co filed Critical Western Union Telegraph Co
Priority to US453604A priority patent/US2500617A/en
Priority to GB12573/43A priority patent/GB564676A/en
Priority to FR971729D priority patent/FR971729A/fr
Application granted granted Critical
Publication of US2500617A publication Critical patent/US2500617A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/24—Stencils; Stencil materials; Carriers therefor
    • B41N1/246—Stencils; Stencil materials; Carriers therefor characterised by the electroconductive means or additives
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/23—Reproducing arrangements

Definitions

  • FIG. I R l4 I3 III as 31 35 H 24 Al A2 5'" 1' 1 r ⁇ e 1'; 2s 29 1i n; 3a
  • N 17 is i I 37 FIG. 3
  • This invention relates generally to an electrosensitivestencil blank and method of forming the same for reproducing copies of writing, pictures, drawings and other subject matter, and more particularly to an improved electrosensitive stencil blank and a method of recording thereon for preparing a master copy of subject matter, which may be in facsimile or otherwise, from which numerous copies may be made by the Mimeograph, hectograph, or other reproducing process.
  • stencils usually have been cut on standard commercial stencil papers by the mechanical action of a scanning stylus operated electromag netically so as intermittently to engage the stencil paper in a direction substantially normal to the plane of the paper.
  • Such stencil paper usually consists of a sheet of an open-texture paper, such as yoshino paper, which has unusually long fibers and a somewhat open and porous structure, impregnated or coated with a soft mixture of oils, resin, waxes and the like.
  • a stencil sheet on which a recording is thus made is permeable to the stencil ink at those points where the stylus removed the impregnant in accordance with the received pattern and, therefore, is suited for use in making any desired number of copies in the usual manner of Mimeograph stencils.
  • One of the objects of the present invention is a stencil sheet from which a stencil may be formed satisfactorily at a rate such that the linear scanning speed at which the stencil form ing device travels may be greatly increased and thus appreciably reduce the time required for producing a. stencil comprising a. given piece of subject matter, while at the same time an exceedingly fine andsharpdefinition of the recorded subject matter is obtainable.
  • the signals for operating. the stencil-forming instrumentality. are transmitted over commercial telegraph circuits, as from one city or point to another, any resultant saving in. line time is of great importance, and since, in accordancewith the instant invention, the permissible linear scanning speed of the stencil recording device is considerably higher than. the-linear scanning speed heretofore obtainable in practice with.
  • a further object is a methodof preparing stencils in which the various elemental areas of the stencil sheet which are affectedor formed at any instant may be madeexceedingly small, whereby sharper and improved definition of the subject matter recorded onthe stencil: may be obtained.
  • Still another object is a stencil sheet adapted for conversion into a stencil by the application thereto of electrical signaling currents which displace an impregnating compound to expose the fibers of a porous sheet in those elemental areas or the sheet through which the signaling currents are caused to pass during a recording operation, without deleteriously affecting the fibers of the sheet.
  • Fig. 1 illustrates diagrammatically a transmitting and receiving system for recording subject matter in facsimile on a stencil sheet embodyingthe present invention
  • Fig. 2 is a perspective-view of thestencil sheet
  • Fig. 3 is a perspective view of one form of stencil sheet in accordance with the invention.
  • a facsimile transmitter T comprising a metallic cylinder or platen l2 rotatably supported by a driving shaft l3 which is journaled in any suitable manner in the frame members l4 and i5.
  • the cylinder is rotated, as by a driving motor it, at a predetermined constant speed in the direction indicated by the curved arrow.
  • the driving motor may be either of the alternating current synchronous type or of the direct current type and may be connected to the driven shaft l3 in any suitable manner, as for example by a driving pulley H and belt 18 which passes around a driven pulley 19 secured to the shaft l3, suitable means being provided to prevent slippage of the belt on the pulleys.
  • a transmitter such as illustrated in Fig. 1
  • transmission of facsimile signals may be effected in the manner described in Patent No. 2,229,091, issued January 21, 1941, or in Patent No. 2,153,858, issued April 11, 1939, or in any other suitable manner.
  • a scanning electrode or stylus 22 whose point bears on the suriace of a transmitting blank 1) bearing conductive characters or other subject matter, is supported by a traveling carriage 23 adapted for longitudinal movement along the cylinder l2 to provide the proper number of scanning lines per inch of the subject matter on the blank.
  • the stylus 22 is caused to traverse the cylinder by means 01' a rotatable threaded shaft 24 geared to the cylinder shaft l3, and therefore the stylus point will describe a helical path as the cylinder I2 is rotated and thus produce a scanning action to scan successively the various elemental areas of the subject matter appearing on the surface of the transmitting blank.
  • the method of obtaining the scanning movement described above is well-known, as are various other methods of scanning a given piece of subject matter.
  • the transmitting stylus 22 is connected by means of a conductor 30 to an amplifier Al, and the metallic drum I2 is connected by means of a brush 25 to the conductor 29 which is also in the circuit of the amplifier Al
  • the transmitted signals may have a carrier frequency component introduced by the transformer 26, which is connected in series with the lead 29 in the transmitting drum circuit.
  • the transmitter T and recorder B may be physically connected to form a combined transmitterrecorder unit or, as indicated by the broken lines L, the transmitter may be located at a point remote from the recording apparatus R.
  • the recording may be effected by any apparatus suitable for the purpose.
  • this apparatus comprises a second amplifier A2 for applying suitable facsimile impulses having a desired signal level to the recording apparatus.
  • the recorder shows one arrangement and method for recording upon a stencil blank s embodying the present invention and comprises a rotatable cylinder or platen 3
  • is rotated in synchronism with the transmitting cylinder I2 in any suitable manner, as by means of an alternating current synchronous motor 32 or other kind of motor which is kept in step with the transmitting motor [6 by any of the various known methods of obtaining synchronism.
  • the recording stencil s is secured to the cylinder 3! in any suitable manner so that it may be traversed by the point of the scanning stylus 33.
  • the stylus 33 is mounted on a traveling carriage 34 and is caused to traverse the recording cylinder in a longitudinal direction by means of the threaded shaft 35 which is geared to the recording drum driving mechanism to provide proper line feed of the scanning unit.
  • the threaded shaft 35 in combination with the rotation of the cylinder 31 produces the scanning action of the stylus 33 to scan successively the various elemental areas of the stencil sheet in the manner in which the scanning action is effected at the transmitting end.
  • facsimile transmitting mechanism above referred to are illustrative only, since any suitable manner of producing facsimile signals may be employed such, for example, as the optical pick-up apparatus shown in Patent No. 2,158,391, issued May 16, 1939.
  • any suitable form of facsimile receiving scanning apparatus may be employed to form a stencil in accordance with the instant invention so long as the stencil sheet is properly scanned, and the proper electrical potentials or currents are selectively applied to the elemental recording areas thereof.
  • Fig. 2 of the drawings illustrates another method of preparing the stencil sheet s, which in this case is retained in flat condition on a platen 42 of metal or other conducting material that serves as a support for the stencil sheet during the recording operation.
  • a stylus 43 which is carried by a pencil 44, is movable manually so that it may be caused to trace any desired subject matter to be recorded, the platen 42 and the stylus 43 being connected by means of conductors 45 and 46 to a suitable source of marking current 48, so that current or the electrical forces produced thereby are caused to pass or be exerted through the stencil sheet s at just the points where the point of the stylus 43 is caused to contact the surface of the stencil sheet.
  • a stencil sheet s embodying the invention is shown in Fig. 3 of the drawings.
  • This stencil sheet which in the form illustrated is adapted to produce a, Mimeograph stencil, preferably comprises a sheet of long-fiber yoshino paper or the like that forms the body portion of the stencil, this sheet being impregnated with a soft stencilforming compound or impregnation, for example, waxy materials, such as paraffin or diglycol stearate, or cellulose acetate, nitrocellulose and other cellulose esters, ethyl cellulose, natural or synthetic resins or gums, such as shellac, rosin, ester gum, cumar, dammar and other well-known varnish gums, or water-sewelling colloids, such as starch, gelatin, pectin and gum tragacanth, or other suitable stencil impregnating materials known in the art.
  • a soft stencilforming compound or impregnation for example, waxy materials, such as paraffin or diglycol stearate, or
  • the impregnation employed is plasticized by a suitable high boiling compound such, for example, as triphenyl phosphate, triacetin, castor oil, tricresyl phosphate and the like.
  • a suitable high boiling compound such as triphenyl phosphate, triacetin, castor oil, tricresyl phosphate and the like.
  • These impregnating materials are mixed with an electrically conductive substance such as, for example, finely divided carbon particles or a metal powder, the conducting substance or particles being present in an amount suflicient to make the stencil impregnation and the paper base electrically conducting to enable the marking currents readily to pass by current conduction through the stencil sheet between the point of the stylus and the platen on which the sheet is supported without injury to the fibers of the paper sheet, and these marking currents cause the impregnation to be displaced at the precise point of contact of the stylus with the stencil sheet at the time the marking currents are applied thereto, and thus expose the thin paper base to make it
  • the rate at which recording may be effected on the stencil sheet is approximately twice the rate heretofore obtainable with an electromagnetically operated stylus and, in fact, can proceed at as fast a rate as is obtainable with electro-chemical recording papers, such as of the type disclosed in Patent No. 2,251,742.
  • Stencils in accordance with the invention have been formed with a linear scanning speed of the recording stylus of the order of 1440 inches per minute and higher, when using a recording drum with a circumference of approximately eight inches and rotating at a speed of 180 R. P. M. or higher.
  • the relative proportions of the conducting material and the other solids in the impregnating compound employed may vary within wide limits.
  • the proportion of a conducting substance such as finely divided carbon
  • the working range may generally be stated to comprise from 5% to of metallic particles with respect to the total impregnation employed. It will be observed that, in general, the amount of metallic particles employed may be somewhat less than in the case where carbon particles are employed, although the carbon particles give .excellent results and in certain instances are preferred to the metallic particles.
  • the amount of carbon particles employed may vary from 5% to 20% with respect to the impregnation, and when metallic particles are employed these percentages may be somewhat less. Excellent results have been obtained when the amount of carbon particles is from to of the gum or resin or cellulose ester composition employed as an impregnation. In the case of waxes, 1 0% 6 to 14% of carbon particles has produced good results.
  • An impregnation which has proved quite satis factory is a highly plasticized cellulose nitrate composition such as disclosed in Patent No. 1,526,- 982, granted February 17, 1925.
  • a suitable amount of finely divided carbon preferably 35% by weight.
  • the carbon may be added to the impregnation by grinding the carbon particles into the impregnation, thereby insuring uniform dispersion of the particles throughout the impregnation and the paper to which the impregnating material is applied, the application of the resultant conducting impregnation being effected in the manner disclosed in Patent No. 1,526,982 for coating or impregnating the yoshino paper base, or may be applied in any other suitable manner known in the impregnating and coating art.
  • the amount of plasticizer used is generally about 50% by weight of the solid content of the impregnating compound in order to render the compound sufficiently plastic at ordinary temperatures to enable ready displacement of the impregnating compound when subjected to the marking potentials without damaging the fibers of the sheet.
  • plasticizers other than those specifically mentioned herein may be employed, for example, dibutyl phthalate, dibutyl tartrate, butyl lactate and the like, the nature of the particular plasticizer employed controlling the amount required to make the impregnating compound plastic at ordinary room temperatures.
  • the desired plasticity of the impregnating compound with which the sheet is impregnated may readily be determined by ascertaining empirically the hardness of the sheet. This may be done by applying to a rectangular mass, for example, a block moulded or cut to A" x A,, x 1", of the solid impregnating material a load of 650 grams on a small circular i'oot one-eighth inch in diameter and, by means of a dial micrometer or other suitable device, observing the thickness, the initial load being applied for purposes of counteracting any effects due to surface variations. Then, by application of an additional 950 gram load, a second reading is taken of the thickness. From this the hardness may be calculated by standard computation as a percentage. The desirable hardness for the most suitable formulas of impregnation is in the neighborhood .of 50%, with a maximum of about 70%. The following examples will serve to illustrate:
  • the apparatus employed to obtain the readings is known as the 'Widney Modulineter, which is commonly employed for measurement of hard-- ness, penetration, resilience and other similar characteristics.
  • plasticizer In the case of a wax, such as the diglycol r stearate mentioned, the addition of plasticizer is unnecessary. However, in the event that harder waxes are used, the addition of plasticizer is d sirable, and in some cases necessary, in order to cause the impregnating compound to remain I substantiall plastic at ordinary temperatures or the temperatures under which the paper is employed, the important consideration in each of these cases being that the impregnating compound be sufiiciently plastic to enable ready dis placement of the compound upon application of the marking potentials or currents without damaging the fibers of the sheet, this ready displacement also facilitating the fine and sharp definition desired.
  • the displacement of the impregnating compound in those areas to which the marking potentials or currents are applied leaves only the thin porous fiber structure of the base sheet so that the marked portions are therefore readily permeable to Mimeograph or other copying ink employed, and without requiring marking potentials or currents of values which in themselves would tend to char or damage the fibrous structure of the sheet. It is to be understood that the displacement of the impregnating compound in the selected elemental areas does not depend upon the melting of the compound under the action of the electrical signalin current, but that it is displaced, apparentl by electrostatic action due to charges impressed on the metallic or carbon particles embodied in the impregnating compound.
  • a stencil in accordance with the instant invention may be formed substantially at a rate corresponding to the rate at which records may be produced by means of electrosensitive recording paper heretofore known, such as the lead thiosulphate recording paper disclosed and claimed in the Kline Patent No. 2,251,742, issued August 5, 1941.
  • the yoshino paper or other porous sheet is suitably impregnated with the above formula, which forms a firm layer on evaporation of the three volatile ingredients of the mixture, which are acetone, benzol and alcohol.
  • the impregnating compound may be introduced into the sheet by floating the sheet on the surface of the impregnating bath, or by passing it through the bath, or by transfer from a roller running in the bath, or other known suitable method. In each case, the excess material may be removed by passing the impregnated sheet over a straight edge or doctor blade, or by passing the sheet over a wire-Wound rod, or between two of such devices, or in other suitable manner known in the art.
  • the stencil sheet will have the same general appearance and form as the usual stencil sheet except that the paper will be opaque and black in color due to the addition of the carbon particles.
  • typewriter carbon paper When a wax material is employed, it is desirable to employ the method used in the manufacture of typewriter carbon paper, which comprises treating one side of the paper with a molten wax composition and removing the excess by drawing over a wire-wound rod. It will be appreciated that, due to the open texture of the base or sheet, the same will be impregnated rather than merely coated.
  • a suitable mixture is parts of diglycol. stearate and 12 parts of carbon.
  • the relative proportions may be varied, depending upon the nature of the impregnating material and the conducting substance, the particular use for which the stencil sheet is designed, and the nature of the subject matter to be recorded thereon.
  • the viscosity of the impregnating solution and the amount put in the sheet may be regulated by varying the proportion of volatile solvents or thinners used.
  • other ingredients may be substituted or added to give certain desirable properties to the completed stencil sheets, and that other substances which will be suitable equivalents for the purpose of the invention may be added or substituted for those given.
  • the degree of conductivity of the completed stencil sheet in accordance with the invention may vary within comparatively wide limits, the important feature being that the sheet be sufficiently conductive to pass the electrical signaling currents without offering undesirabl high resistance thereto and without causing the formation of destructive arcs which might burn or otherwise damage the paper base.
  • Excellent results have been obtained by using alternating current signaling potentials of from 200 to 300 volts, at 2500 cycles, with marking currents of the order of from 20 to 30 milliamperes, although it is to be understood that the stencil sheet may be used with potentials lying outside the range stated and with other signaling frequencies and with other values of marking current.
  • the recording may be effected with direct current signals which may be either positive or negative as applied to the recording stylus.
  • the stencil sheet is made as thin as practicable, although for certain purposes it may be desirable to employ thicker or heavier sheets.
  • Stencil sheets prepared in accordance with the invention may be stored for long periods of time without showing deleterious effects from heat, light, moisture or other conditions to which they may be subjected, and they may be manufactured at a cost comparable to that of commercial stencil type-impressible sheets.
  • the details of reproducing copies therefrom, by the Mimeograph or other process are the same as those of stencil sheets of commercial types currently in use, including the sponging ofi of the Mimeograph or other printing ink with the usual solvents preparatory to storage of the stencil for future use.
  • the invention is not limited to the examples or compounds described above, but that it broadly comprehends a stencil sheet adapted to be converted into a stencil by the application thereto of electrical signaling potentials, and having as its essentials a base, such as yoshino or other porous material, impregnated with a conductive impregnation which has the characteristic of being readily displaceable to expose the porous base in selected elemental areas of the stencil sheet in response to electrical signaling currents passed therethrough during a recording operation.
  • a base such as yoshino or other porous material
  • An electrosensitive stencil sheet adapted for conversion into a stencil by electrical signaling currents applied to the sheet by means of a scanning stylus, said sheet comprising a fibrous base of porous open character, said sheet being impregnated with a stencil-sheet filling compound which is impervious to ink and when displaced defines the subject matter to be recorded, said impregnating compound having homogeneously embodied therein a conductive material in an amount to provide a path of sufficiently high conductivity that currents of approximately to milliamperes will flow by conduction through the stencil sheet when potentials of approximately 200 to 300 volts at 2500 cycles are applied by the stylus to said sheet, said conductive impregnating compound having a plasticity such that the hardness thereof, when calculated as a percentage from readings obtained b a Widney Modulimeter, is not less than approximately nor greater than approximately whereby the impregnating compound readily is displaceable by the passing therethrough of signaling currents of such amplitude and duration as will expose the fibrous structure of said base

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
US453604A 1942-08-04 1942-08-04 Electrosensitive stencil blank Expired - Lifetime US2500617A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE474200D BE474200A (fr) 1942-08-04
US453604A US2500617A (en) 1942-08-04 1942-08-04 Electrosensitive stencil blank
GB12573/43A GB564676A (en) 1942-08-04 1943-08-04 Electrosensitive recording blank
FR971729D FR971729A (fr) 1942-08-04 1946-04-03 Feuille enregistreuse sensible au courant électrique et sa fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US453604A US2500617A (en) 1942-08-04 1942-08-04 Electrosensitive stencil blank

Publications (1)

Publication Number Publication Date
US2500617A true US2500617A (en) 1950-03-14

Family

ID=23801241

Family Applications (1)

Application Number Title Priority Date Filing Date
US453604A Expired - Lifetime US2500617A (en) 1942-08-04 1942-08-04 Electrosensitive stencil blank

Country Status (4)

Country Link
US (1) US2500617A (fr)
BE (1) BE474200A (fr)
FR (1) FR971729A (fr)
GB (1) GB564676A (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2635534A (en) * 1948-04-30 1953-04-21 Huebner Company Process for preparing an electrographic reproduction instrumentality
US2664043A (en) * 1947-06-17 1953-12-29 Timefax Corp Stencil recording blank and process of preparation
US2713822A (en) * 1948-12-20 1955-07-26 Columbia Ribbon & Carbon Planographic printing
US2726168A (en) * 1951-07-11 1955-12-06 Western Union Telegraph Co Electrosensitive recording and duplicating blank
US3062675A (en) * 1959-03-30 1962-11-06 Weber Addressing Machine Co In Stencil paper and coating composition
US3091550A (en) * 1958-09-24 1963-05-28 Union Carbide Corp Adsorbent compositions and method of coating therewith
US3113511A (en) * 1961-02-27 1963-12-10 Harold R Dalton Composite stencil-offset printing blank
US3125021A (en) * 1955-11-14 1964-03-17 Smooth
US3283704A (en) * 1964-02-18 1966-11-08 Timefax Corp Electrosensitive facsimile stencilforming blanks
US3376810A (en) * 1963-06-21 1968-04-09 Gestetner Ltd Duplicating stencils
US3934503A (en) * 1967-06-26 1976-01-27 Iit Research Institute Stencil screens
EP0291137A1 (fr) * 1987-05-15 1988-11-17 Stork Screens B.V. Procédé pour la fabrication de pochoirs métalliques texturés et pochoir métallique portant une couche susceptible d'être dessinée
US5000688A (en) * 1987-12-22 1991-03-19 Clamp Esther L Magnetic stencil letters
FR2819448A1 (fr) * 2001-01-18 2002-07-19 Jean Baptiste Chaumette Dispositif de reprographie destine aux enfants

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1526982A (en) * 1922-04-07 1925-02-17 Dick Co Ab Stencil sheet
US1795461A (en) * 1923-09-15 1931-03-10 Dick Co Ab Stencil blank
US1850600A (en) * 1929-12-18 1932-03-22 Rca Corp Recording paper
US2026872A (en) * 1931-04-24 1936-01-07 American Television Lab Inc Television receiving method and apparatus
US2040142A (en) * 1932-05-07 1936-05-12 Koreska Wilhelm Recording support
US2108852A (en) * 1934-04-27 1938-02-22 Gettinger Joseph Television apparatus
US2194291A (en) * 1938-11-30 1940-03-19 Corn Prod Refining Co Stencil coating compound and process of making the same
US2229091A (en) * 1935-07-09 1941-01-21 Western Union Telegraph Co Telegraphic transmission of intelligence
US2294150A (en) * 1939-02-16 1942-08-25 Western Union Telegraph Co Facsimile recording blank
US2310946A (en) * 1939-04-07 1943-02-16 William G H Finch Facsimile recording paper
US2328198A (en) * 1939-04-12 1943-08-31 Knowiton Bros Low electrical resistance paper and method of making same
US2346670A (en) * 1940-01-19 1944-04-18 Western Union Telegraph Co Method of and means for recording signals electrically

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1526982A (en) * 1922-04-07 1925-02-17 Dick Co Ab Stencil sheet
US1795461A (en) * 1923-09-15 1931-03-10 Dick Co Ab Stencil blank
US1850600A (en) * 1929-12-18 1932-03-22 Rca Corp Recording paper
US2026872A (en) * 1931-04-24 1936-01-07 American Television Lab Inc Television receiving method and apparatus
US2040142A (en) * 1932-05-07 1936-05-12 Koreska Wilhelm Recording support
US2108852A (en) * 1934-04-27 1938-02-22 Gettinger Joseph Television apparatus
US2229091A (en) * 1935-07-09 1941-01-21 Western Union Telegraph Co Telegraphic transmission of intelligence
US2194291A (en) * 1938-11-30 1940-03-19 Corn Prod Refining Co Stencil coating compound and process of making the same
US2294150A (en) * 1939-02-16 1942-08-25 Western Union Telegraph Co Facsimile recording blank
US2310946A (en) * 1939-04-07 1943-02-16 William G H Finch Facsimile recording paper
US2328198A (en) * 1939-04-12 1943-08-31 Knowiton Bros Low electrical resistance paper and method of making same
US2346670A (en) * 1940-01-19 1944-04-18 Western Union Telegraph Co Method of and means for recording signals electrically

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2664043A (en) * 1947-06-17 1953-12-29 Timefax Corp Stencil recording blank and process of preparation
US2635534A (en) * 1948-04-30 1953-04-21 Huebner Company Process for preparing an electrographic reproduction instrumentality
US2713822A (en) * 1948-12-20 1955-07-26 Columbia Ribbon & Carbon Planographic printing
US2726168A (en) * 1951-07-11 1955-12-06 Western Union Telegraph Co Electrosensitive recording and duplicating blank
US3125021A (en) * 1955-11-14 1964-03-17 Smooth
US3091550A (en) * 1958-09-24 1963-05-28 Union Carbide Corp Adsorbent compositions and method of coating therewith
US3062675A (en) * 1959-03-30 1962-11-06 Weber Addressing Machine Co In Stencil paper and coating composition
US3113511A (en) * 1961-02-27 1963-12-10 Harold R Dalton Composite stencil-offset printing blank
US3376810A (en) * 1963-06-21 1968-04-09 Gestetner Ltd Duplicating stencils
US3283704A (en) * 1964-02-18 1966-11-08 Timefax Corp Electrosensitive facsimile stencilforming blanks
US3934503A (en) * 1967-06-26 1976-01-27 Iit Research Institute Stencil screens
EP0291137A1 (fr) * 1987-05-15 1988-11-17 Stork Screens B.V. Procédé pour la fabrication de pochoirs métalliques texturés et pochoir métallique portant une couche susceptible d'être dessinée
US4946763A (en) * 1987-05-15 1990-08-07 Stork Screens B.V. Method for providing a design pattern on a metal stencil and metal stencil having a patternable covering layer
US5000688A (en) * 1987-12-22 1991-03-19 Clamp Esther L Magnetic stencil letters
FR2819448A1 (fr) * 2001-01-18 2002-07-19 Jean Baptiste Chaumette Dispositif de reprographie destine aux enfants

Also Published As

Publication number Publication date
FR971729A (fr) 1951-01-22
GB564676A (en) 1944-10-09
BE474200A (fr)

Similar Documents

Publication Publication Date Title
US2500617A (en) Electrosensitive stencil blank
US2664043A (en) Stencil recording blank and process of preparation
US2398779A (en) Method of making duplicating blanks by telefacsimile and the like
US2664044A (en) Electric signal recording blank
US2294149A (en) Method of and means for recording signals
US2173741A (en) Electrostatic recording mechanism
US2294146A (en) Electrosensitive recording blank
US2310946A (en) Facsimile recording paper
US2251742A (en) Means for recording signals electrically
US2229091A (en) Telegraphic transmission of intelligence
US3509088A (en) Carbon black dispersions,their preparation and film products therewith
DE1446655C3 (fr)
US3118789A (en) Electrically conductive coated paper
US2346670A (en) Method of and means for recording signals electrically
US2425742A (en) Electrosensitive recording blank
US2294150A (en) Facsimile recording blank
GB729149A (en) Electrosensitive recording and duplicating blank
GB725142A (en) Improvements in or relating to method and means for magnetic reproduction of pictures
US2593923A (en) Method of making a telegraphic facsimile transmitting blank
US2572871A (en) Facsimile transmitting means and method of using same
US3376810A (en) Duplicating stencils
US2528005A (en) Electrosensitive recording blank
US2692228A (en) Electrolytic recording paper
US3265531A (en) Electrically recording paper
US2861515A (en) Method of making duplicating master