US3250637A - Heat stencilizable stencil - Google Patents

Heat stencilizable stencil Download PDF

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Publication number
US3250637A
US3250637A US12242361A US3250637A US 3250637 A US3250637 A US 3250637A US 12242361 A US12242361 A US 12242361A US 3250637 A US3250637 A US 3250637A
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US
United States
Prior art keywords
stencil
wax
heat
coating
stencilizable
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
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Inventor
Paul E Frasher
Abraham D Davis
Hersh A Platkevich
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.)
AB Dick Co
Original Assignee
AB Dick 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
Application filed by AB Dick Co filed Critical AB Dick Co
Priority to US12242361 priority Critical patent/US3250637A/en
Priority to FR902590A priority patent/FR1330394A/en
Priority to NL280460D priority patent/NL280460A/xx
Priority to DED39318A priority patent/DE1229114B/en
Priority to GB264862A priority patent/GB990925A/en
Priority to BE619881A priority patent/BE619881A/en
Application granted granted Critical
Publication of US3250637A publication Critical patent/US3250637A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
    • B41C1/148—Forme preparation for stencil-printing or silk-screen printing by a traditional thermographic exposure using the heat- or light- absorbing properties of the pattern on the original, e.g. by using a flash
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/913—Material designed to be responsive to temperature, light, moisture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/2495—Thickness [relative or absolute]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
    • Y10T428/273—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
    • Y10T428/277—Cellulosic substrate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31801—Of wax or waxy material
    • Y10T428/31804—Next to cellulosic
    • Y10T428/31808—Cellulosic is paper

Definitions

  • the present invention relates to a stencil of the type having a coating thereon which will react when subjected to heat to provide an imaged area.
  • the conventional materials employed for the displaceable coatings have been employed in relatively large amounts to provide a sufficiently strong stencil sheet. Furthermore, the thickness of standard stencil sheets of the thermographic type has been excessive due to the fact that the coating materials employed are not sufficiently abrasion resistant to permit the use of thinner coatings.
  • thermographic stencil with a coating having the above noted properties and also having suflicient abrasion resistance whereby the use of thinner coatings is made possible.
  • the heat stencilizable stencil of this invention is characterized by a light weight and thin base sheet having a coating composed of various amounts of a hard, high melting point wax, with or without parafiin wax, and wax soluble polymer additives.
  • the base sheet employed in the therm-ographic stencil of this invention comprises a sheet of thin, porous tissue having a weight from 4 to 7 pounds and preferably 4 to pounds per 3,000 square feet of tissue.
  • the tissue employed is a standard stencil base sheet insofar as composition is concerned, such as is formed of yoshinofiber, synthetic organic fiber or mixtures thereof, and it is preferably provided in thicknesses of from 0.8 to 1.2 mils, although thicknesses up to 2 mils are contemplated.
  • the porosity, as measured on a Gurley Permeameter-4 ply, is preferably above 200 cu. ft./ sq. ft./min.
  • the coating which is applied to the described tissue is composed of from 50 to 100% of a hard, high melting point Wax.
  • the melting point of the wax should fall within the range of 160 to 210 F., and preferably is 190 to 195 F. or 200 to 210 F.
  • the hardness of the wax (100 gr./77/5 sec.) (ASTM D132l-6lT) preferably falls within the range of 5 to 10, but may fall within the broader range of 0 to 20.
  • the coating may include from 0 to of any commercial parafiin wax and is preferably formulated to contain from 10-35 percent by Weight of the paraffin wax.
  • a Wax soluble polymer can be added to increase the toughness and oil resistance of the coating in an amount within the range of 0-5 percent by weight and preferably 1-4 percent by weight.
  • Suitable polymers maybe selected from the group consisting of the copolymers of vinyl acetate and vinyl stearate, the copolymers of ethylene and vinyl acetate, and the copolymers of ethylene and ethyl acrylate.
  • the coating can be formulated of the high melting point wax having the above describedc-haracterist-ics alone, and the waxshould be coated on the tissue to obtain a weight of from 4 to 10 pounds per 3,000 square feet.
  • Example B 190-210 F. High M.P. Wax (Be Square wax) 65 Parafiin wax 31 Vinyl acetate-vinyl stearate copolymer 4 This Wax mixture should be coated on the tissue to obtain a weight between 4 to 10 pounds per 3,000 square feet.
  • Example A As a specific example of the application of this invention to the formation of a stencil, a mixture of the foregoing Example A was dissolved in hot toluene (140150 F.) at a solids content of 25%. The solution was coated onto a 4.5 lb. (24 x 36--500) stencil base tissue at a coating Weight of 5 to 6 pounds per 3,000 square feet and thendried.
  • the stencil is placed adjacent an original having infra red ray absorbing, heat generating outlines thereon, and the assembly is subjected to a source of infra red radiation.
  • a temperature rise from ambient temperature to a temperature in the range of from F. to 210 F. is realized in the imaged portion of the original to provide a heat pattern
  • the coating composition in the corresponding areas on the stencil sheet is reduced to a flowable condition and displaced upon transfer of the heat pattern whereby openings in the stencil sheet are provided through which ink can flow.
  • the original may be employed in the form of a separate sheet or it can be present as an image applied directly to the stencilizable sheet.
  • the heat stencilizable stencils of this invention are particularly suitable for use in conjunction with an assembly described and claimed in applicants copending application entitled Assembly for Imaging Heat Stencilizable Stencils, Serial No. 122,587, filed July 7, 1961.
  • the assembly described in the copending application generally comprises a top sheet of a relatively infra red transparent, poorly heat conductive shield; a protective, infra red transparent film located beneath the top sheet; and an infra red transparent, heat conductive film located adjacent the protective film.
  • the stencil sheet of this invention is adapted to be fitted between the protective film and the heat con- 'ductive film, and the original will be located beneath the heat conductive film.
  • Stencils produced with an assembly Patented May 10, 1966 of this type are particularly free of objectionable background and dust or dirt on the original or on the belt or plate of the device used for imaging the stencil is effectively avoided.
  • the above described stencil is characterized by the use of a thinner base sheet which permits the application of a lighter coating on the base sheet. It is appreciated by the art that thinner stencil sheets enable the ultimate produc tion of better copy and the particular coating employed with the stencil of this invention permits the use of a thinner coating due to the hardness of the materials em ployed.
  • a heat stencilizable stencil comprising a base sheet having a weight of 4 to 5 pounds per 3,000 square feet, a thickness of from 0.8 to 1.2 mils and a minimum porosity of 200 cu. ft./ sq. ft./min,, and a coating on said base sheet uniformly applied in amounts of from 4 to pounds per 3,000 square feet, said coating consisting essentially of from 61 to 89% of a wax having a melting point from 4 160 to 210 F., and a hardness of from 5 to 10 (100 gr./ 77 F./5 sec.), from 10 to of a paraffin wax and from 1 to 4% of a wax soluble polymer.
  • a stencilizable stencil comprising a base sheet having a weight of 4 to 7 pounds per 3,000 square feet, a thickness from 0.8 to 2.0 mils and a minimum porosity of 200 cu. ft./sq., ft./min., and a coating on said base sheet uniformly applied in amounts of from 4 to 10 pounds per 3,000 square feet, said coating consisting essentially of from 61% to 89% of a wax having a melting point from 160 to 210 F., and a hardness of from 5 to 10 gr./77 F./5 sec.), from 10 to 35% of a paraffin wax and from 1 to 4% of a wax soluble polymer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Laminated Bodies (AREA)

Description

United States Patent 3,250,637 HEAT STENCILIZABLE STENCIL Paul E. Frasher, Chicago, Abraham D. Davis, Dolton, and Hersh A. Platkevich, Chicago, Ill., assignors to A. B. Dick Company, Niles, Ill., a corporation of Illinois No Drawing. Filed July 7, 1961, Ser. No. 122,423 2 Claims. (Cl. 11735.5)
The present invention relates to a stencil of the type having a coating thereon which will react when subjected to heat to provide an imaged area.
relatively non-infra red ray absorbing material and is ink.
impervious. Therefore, when the stencil is placed on a duplicating machine ink will penetrate only in the stencilized image area and multiple copies may be produced.
The conventional materials employed for the displaceable coatings have been employed in relatively large amounts to provide a sufficiently strong stencil sheet. Furthermore, the thickness of standard stencil sheets of the thermographic type has been excessive due to the fact that the coating materials employed are not sufficiently abrasion resistant to permit the use of thinner coatings.
These attributes of prior stencils of the type described add to the cost of the items and it is therefore an object of this invention to provide a more economical and otherwise improved stencil of the thermographic type.
It is an additional object of this invent-ion to provide a heat stencilizable stencil with a heat displaceable, ink impervious coating which need not-be employed in relatively large amounts to provide a satisfactory stencil.
It is a further object of this invention to provide an improved thermographic stencil with a coating having the above noted properties and also having suflicient abrasion resistance whereby the use of thinner coatings is made possible.
These and other objects of this invention will appear hereinafter and it will be understood that the various examples hereinafter set forth are provided for purposes of illustration and not for purpose of limitation.
The heat stencilizable stencil of this invention is characterized by a light weight and thin base sheet having a coating composed of various amounts of a hard, high melting point wax, with or without parafiin wax, and wax soluble polymer additives.
The base sheet employed in the therm-ographic stencil of this invention comprises a sheet of thin, porous tissue having a weight from 4 to 7 pounds and preferably 4 to pounds per 3,000 square feet of tissue. The tissue employed is a standard stencil base sheet insofar as composition is concerned, such as is formed of yoshinofiber, synthetic organic fiber or mixtures thereof, and it is preferably provided in thicknesses of from 0.8 to 1.2 mils, although thicknesses up to 2 mils are contemplated. The porosity, as measured on a Gurley Permeameter-4 ply, is preferably above 200 cu. ft./ sq. ft./min.
The coating which is applied to the described tissue is composed of from 50 to 100% of a hard, high melting point Wax. The melting point of the wax should fall within the range of 160 to 210 F., and preferably is 190 to 195 F. or 200 to 210 F. The hardness of the wax (100 gr./77/5 sec.) (ASTM D132l-6lT) preferably falls within the range of 5 to 10, but may fall within the broader range of 0 to 20.
The coating may include from 0 to of any commercial parafiin wax and is preferably formulated to contain from 10-35 percent by Weight of the paraffin wax. Likewise a Wax soluble polymer can be added to increase the toughness and oil resistance of the coating in an amount within the range of 0-5 percent by weight and preferably 1-4 percent by weight. Suitable polymers maybe selected from the group consisting of the copolymers of vinyl acetate and vinyl stearate, the copolymers of ethylene and vinyl acetate, and the copolymers of ethylene and ethyl acrylate.
As suggested above, the coating can be formulated of the high melting point wax having the above describedc-haracterist-ics alone, and the waxshould be coated on the tissue to obtain a weight of from 4 to 10 pounds per 3,000 square feet.
Further examples of a suitable coating are as follows:
Example A Percent 190195 Be Square wax (Bareco WaxCo.) 70 l30-l32 parafiin 27 Dow resin X3488.3 3
10 Example B 190-210 F. High M.P. Wax (Be Square wax) 65 Parafiin wax 31 Vinyl acetate-vinyl stearate copolymer 4 This Wax mixture should be coated on the tissue to obtain a weight between 4 to 10 pounds per 3,000 square feet.
As a specific example of the application of this invention to the formation of a stencil, a mixture of the foregoing Example A was dissolved in hot toluene (140150 F.) at a solids content of 25%. The solution was coated onto a 4.5 lb. (24 x 36--500) stencil base tissue at a coating Weight of 5 to 6 pounds per 3,000 square feet and thendried.
In use, the stencil is placed adjacent an original having infra red ray absorbing, heat generating outlines thereon, and the assembly is subjected to a source of infra red radiation. Upon directing of a sufiicient quantity of radiations rich'in infra red onto the original, a temperature rise from ambient temperature to a temperature in the range of from F. to 210 F. is realized in the imaged portion of the original to provide a heat pattern, The coating composition in the corresponding areas on the stencil sheet is reduced to a flowable condition and displaced upon transfer of the heat pattern whereby openings in the stencil sheet are provided through which ink can flow. The original may be employed in the form of a separate sheet or it can be present as an image applied directly to the stencilizable sheet.
The heat stencilizable stencils of this invention are particularly suitable for use in conjunction with an assembly described and claimed in applicants copending application entitled Assembly for Imaging Heat Stencilizable Stencils, Serial No. 122,587, filed July 7, 1961. The assembly described in the copending application generally comprises a top sheet of a relatively infra red transparent, poorly heat conductive shield; a protective, infra red transparent film located beneath the top sheet; and an infra red transparent, heat conductive film located adjacent the protective film. The stencil sheet of this invention is adapted to be fitted between the protective film and the heat con- 'ductive film, and the original will be located beneath the heat conductive film. Stencils produced with an assembly Patented May 10, 1966 of this type are particularly free of objectionable background and dust or dirt on the original or on the belt or plate of the device used for imaging the stencil is effectively avoided. V
The above described stencil is characterized by the use of a thinner base sheet which permits the application of a lighter coating on the base sheet. It is appreciated by the art that thinner stencil sheets enable the ultimate produc tion of better copy and the particular coating employed with the stencil of this invention permits the use of a thinner coating due to the hardness of the materials em ployed.
There has been described a simple, practical method of making multiple copies of any original which has outlines-thereon which will convert radiant energy to heat energy.
It will be understood that various modifications may be made in the above described stencil which provide the characteristics of this invention without departing from the spirit thereof, particularly as defined in the following claims.
We claim:
1. A heat stencilizable stencil comprising a base sheet having a weight of 4 to 5 pounds per 3,000 square feet, a thickness of from 0.8 to 1.2 mils and a minimum porosity of 200 cu. ft./ sq. ft./min,, and a coating on said base sheet uniformly applied in amounts of from 4 to pounds per 3,000 square feet, said coating consisting essentially of from 61 to 89% of a wax having a melting point from 4 160 to 210 F., and a hardness of from 5 to 10 (100 gr./ 77 F./5 sec.), from 10 to of a paraffin wax and from 1 to 4% of a wax soluble polymer.
2.- A stencilizable stencil comprising a base sheet having a weight of 4 to 7 pounds per 3,000 square feet, a thickness from 0.8 to 2.0 mils and a minimum porosity of 200 cu. ft./sq., ft./min., and a coating on said base sheet uniformly applied in amounts of from 4 to 10 pounds per 3,000 square feet, said coating consisting essentially of from 61% to 89% of a wax having a melting point from 160 to 210 F., and a hardness of from 5 to 10 gr./77 F./5 sec.), from 10 to 35% of a paraffin wax and from 1 to 4% of a wax soluble polymer.
References Cited by the Examiner UNITED STATES PATENTS 1,168,223 1/1916 Pembroke 1l735.5 2,756,161 7/1956 Horii 117--35.5 2,808,777 10/ 1957 Roshkind 117158 2,858,236 10/ 1958 Asselin et a1 1l7-68 2,877,196 3/1959 Reding 26028.5 2,927,039 3/ 1960 Vander Weel ll736.7 2,999,765 9/ 1961 Boenau 11776 3,062,675 1 1/ 1962 Shelffo 1 l735 .5
WILLIAM D. MARTIN, Primary Examiner. JOSEPH B. SPENCER, Examiner.

Claims (1)

1. A HEAT STENCILIZABLE STENCIL COMPRISING A BASE SHEET HAVING A WEIGHT OF 4 TO 5 POUNDS PER 3,000 SQUARE FEET, A THICKNESS OF FROM 0.8 TO 1.2 MILS AND A MINIMUM POROSITY OF 200 CU. FT/SQ. FT./MIN., AND A COATING ON SAID BASE SHEET UNIFORMLY APPLIED IN AMOUNTS OF FROM 4 TO 10 POUNDS PER 3,000 SQUARE FEET, SAID COATING CONSISTING ESSENTIALLY OF FROM 61 TO 89% OF A WAX HAVING A MELTING POINT FROM 160 TO 210*F., AND A HARDNESS OF FROM 5 TO 10 (100 GR./ 77*F./5 SEC.), FROM 10 TO 35% OF A PARAFFIN WAX AND FROM 1 TO 4% OF A WAX SOLUBLE POLYMER.
US12242361 1961-07-07 1961-07-07 Heat stencilizable stencil Expired - Lifetime US3250637A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US12242361 US3250637A (en) 1961-07-07 1961-07-07 Heat stencilizable stencil
FR902590A FR1330394A (en) 1961-07-07 1962-06-30 Stencil prepared thermally or thermographically, and bundle incorporating such a stencil
NL280460D NL280460A (en) 1961-07-07 1962-07-03
DED39318A DE1229114B (en) 1961-07-07 1962-07-05 Printing stencil sheets for the production of stencils by thermographic means
GB264862A GB990925A (en) 1961-07-07 1962-07-06 Thermographic heat stencilizable stencil sheet and assembly
BE619881A BE619881A (en) 1961-07-07 1962-07-06 Heat-sensitive stencil sheet and bundle including this sheet

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12258761A 1961-07-07 1961-07-07
US12242361 US3250637A (en) 1961-07-07 1961-07-07 Heat stencilizable stencil

Publications (1)

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US3250637A true US3250637A (en) 1966-05-10

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US12242361 Expired - Lifetime US3250637A (en) 1961-07-07 1961-07-07 Heat stencilizable stencil

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US (1) US3250637A (en)
BE (1) BE619881A (en)
DE (1) DE1229114B (en)
FR (1) FR1330394A (en)
GB (1) GB990925A (en)
NL (1) NL280460A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3499805A (en) * 1966-08-29 1970-03-10 Us Air Force Process for deep etching a silicon wafer
US3632376A (en) * 1969-05-09 1972-01-04 Columbia Ribbon & Carbon Heat-stencil assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2256338A1 (en) * 1972-11-14 1974-05-22 Gerhard Ritzerfeld PROCESS FOR GENERATING AND / OR REPRODUCING A PRINT FORM PROVIDED WITH GRID DOTS, AND A DEVICE AND PLASTIC FILM FOR GENERATING SUCH PRINT FORM

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1168223A (en) * 1914-04-18 1916-01-11 Charles J Pembroke Opaque stencil-paper and process for making it.
US2756161A (en) * 1952-07-30 1956-07-24 Horii Shinjiro Stencil sheets
US2808777A (en) * 1952-02-26 1957-10-08 Dick Co Ab Method for manufacturing duplicating masters
US2858236A (en) * 1954-08-31 1958-10-28 Whirlpool Co Method of coating fibrous hardboard panels and resultant article
US2877196A (en) * 1956-05-02 1959-03-10 Union Carbide Corp Coating composition containing wax and ethylene-vinyl acetate copolymer
US2927039A (en) * 1957-03-07 1960-03-01 Labelon Tape Co Inc Heat sensitive copying sheet
US2999765A (en) * 1958-06-11 1961-09-12 Socony Mobil Oil Co Inc Coating for milk containers
US3062675A (en) * 1959-03-30 1962-11-06 Weber Addressing Machine Co In Stencil paper and coating composition

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1168223A (en) * 1914-04-18 1916-01-11 Charles J Pembroke Opaque stencil-paper and process for making it.
US2808777A (en) * 1952-02-26 1957-10-08 Dick Co Ab Method for manufacturing duplicating masters
US2756161A (en) * 1952-07-30 1956-07-24 Horii Shinjiro Stencil sheets
US2858236A (en) * 1954-08-31 1958-10-28 Whirlpool Co Method of coating fibrous hardboard panels and resultant article
US2877196A (en) * 1956-05-02 1959-03-10 Union Carbide Corp Coating composition containing wax and ethylene-vinyl acetate copolymer
US2927039A (en) * 1957-03-07 1960-03-01 Labelon Tape Co Inc Heat sensitive copying sheet
US2999765A (en) * 1958-06-11 1961-09-12 Socony Mobil Oil Co Inc Coating for milk containers
US3062675A (en) * 1959-03-30 1962-11-06 Weber Addressing Machine Co In Stencil paper and coating composition

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3499805A (en) * 1966-08-29 1970-03-10 Us Air Force Process for deep etching a silicon wafer
US3632376A (en) * 1969-05-09 1972-01-04 Columbia Ribbon & Carbon Heat-stencil assembly

Also Published As

Publication number Publication date
NL280460A (en) 1964-12-10
FR1330394A (en) 1963-06-21
DE1229114B (en) 1966-11-24
BE619881A (en) 1962-11-05
GB990925A (en) 1965-05-05

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