US4444808A
Expired / Lapsed
US
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Stencil paper for mimeography and process for making stencil
Assignee: Fujifilm Business Innovation Corp
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Filing: 1982-09-07
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Granted: 1984-04-24
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Expires: 2002-09-07
Abstract
Abstract A stencil paper for mimeography is disclosed. The paper is comprised of a porous base which is permeable to mimeographic ink, having thereon a heat-sensitive layer of a material that is solid at ordinary temperatures but which liquifies upon heating. A process for making a stencil is also disclosed, which comprises placing the stencil paper in contact with a receiving medium and selectively heating the stencil paper to liquify portions of the heat-sensitive layer, and allowing the liquified portions of the heat-sensitive layer to transfer to the receiving medium.
Inventors
- 👤 Yoshiki Kikuchi
- 👤 Haruhiko Moriguchi
- 👤 Takashi Ohmori
- 👤 Katsuo Makino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:02
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/24; B41N1/242; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/24802; Y10T428/24851; Y10T428/24934; Y10T428/24942; Y10T428/249921; Y10T428/249953; Y10T428/249962; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31801; Y10T428/31804; Y10T428/31808
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
54 words
A mimeographic stencil paper comprising: a porous base which is permeable to mimeographic ink, an overcoat, formed on one surface of said base, comprised of a heat-sensitive material that is solid at ordinary temperature but which liquefies upon heating, and a layer comprised of a heat-sublimable material positioned between said base and said overcoat.
Claim 2
Dependent Claim
54 words
A mimeographic stencil paper comprising: a porous base which is permeable to mimeographic ink, an overcoat, formed on one surface of said base, comprised of a heat-sensitive material that is solid at ordinary temperature but which liquefies upon heating, and a layer comprised of a heat-sublimable material positioned between said base and said overcoat.
Claim 3
Dependent Claim
19 words
A mimeographic stencil paper as claimed in claim 1, wherein said heat-sensitive material liquefies upon heating to 45°-150° C.
Claim 4
Dependent Claim
15 words
A mimeographic stencil paper as claimed in claim 2, wherein said heat-sensitive material is wax.
Claim 5
Dependent Claim
19 words
A mimeographic stencil paper as claimed in claim 1, wherein said heat-sublimable material sublimates upon heating to 45°-150° C.
Claim 6
Dependent Claim
30 words
A mimeographic stencil paper as claimed in claim 4, wherein said heat-sublimable material is selected from the group consisting of a nitro dye, a monoazo dye and a disazo dye.
Claim 7
Dependent Claim
25 words
A mimeographic stencil paper as claimed in claim 1, wherein said heat-sublimable layer has a sublimation temperature higher than the melting temperature of said overcoat.
Claim 8
Dependent Claim
33 words
A mimeographic stencil paper as claimed in claim 1, wherein said heat-sublimable layer is comprised of a nitro dye, a monoazo dye or a disazo dye and said overcoat is comprised of wax.
Claim 9
Dependent Claim
20 words
A mimeographic stencil paper as claimed in claim 1, wherein said overcoat has a thickness of 2 to 15 μm.
Claim 10
Dependent Claim
21 words
A mimeographic stencil paper as claimed in claim 1, wherein said heat-sublimable layer has a thickness of 2 to 15 μm.
Claim 11
Dependent Claim
17 words
A mimeographic stencil paper as claimed in claim 1, wherein said heat-sublimable material is a heat-sublimable dye.
Claim 12
Dependent Claim
134 words
A process for making a stencil for mimeography comprising the steps of: providing a stencil paper comprising a porous base permeable to mimeographic ink having on one surface thereof in sequence a layer comprised of a heat-sublimable material and an overcoat comprised of a heat-sensitive material that is solid at ordinary temperature but which liquefies upon heating; providing a receiving medium in contact with the heat-sensitive layer; selectively heating portions of the heat-sublimable layer and the heat-sensitive layer with a thermal head to an extent that the heated portions of the heat-sensitive layer are liquefied; allowing the liquefied portions of the heat-sensitive layer to transfer to the receiving medium; and uniformly heating the thus treated stencil paper to an extent that the heated portions of the heat-sublimable layer remaining on the base are sublimated.
Claim 13
Dependent Claim
134 words
A process for making a stencil for mimeography comprising the steps of: providing a stencil paper comprising a porous base permeable to mimeographic ink having on one surface thereof in sequence a layer comprised of a heat-sublimable material and an overcoat comprised of a heat-sensitive material that is solid at ordinary temperature but which liquefies upon heating; providing a receiving medium in contact with the heat-sensitive layer; selectively heating portions of the heat-sublimable layer and the heat-sensitive layer with a thermal head to an extent that the heated portions of the heat-sensitive layer are liquefied; allowing the liquefied portions of the heat-sensitive layer to transfer to the receiving medium; and uniformly heating the thus treated stencil paper to an extent that the heated portions of the heat-sublimable layer remaining on the base are sublimated.
Claim 14
Dependent Claim
26 words
A process for making a stencil as claimed in claim 11, wherein the receiving medium has a different color from the material of the heat-sensitive layer.
Claim 15
Dependent Claim
34 words
A process for making a stencil as claimed in claim 11, wherein the receiving medium is provided against the heat-sensitive layer by means of a backup roller which continually rotates during the selective heating.
Claim 16
Dependent Claim
19 words
A process for making a stencil as claimed in claim 11, wherein said heat-sublimable material is a heat-sublimable dye.
Claim 17
Dependent Claim
21 words
A process for making a stencil as claimed in claim 11, wherein said heat-sensitive material liquefies upon heating to 45°-150° C.
Claim 18
Dependent Claim
18 words
A process for making a stencil as claimed in claim 15, wherein said heat-sensitive material is a wax.
Claim 19
Dependent Claim
21 words
A process for making a stencil as claimed in claim 11, wherein said heat-sublimable material sublimates upon heating to 45°-150° C.
Claim 20
Dependent Claim
32 words
A process for making a stencil as claimed in claim 17, wherein said heat-sublimable material is selected from the group consisting of a nitro dye, a monoazo dye and a disazo dye.
Claim 21
Dependent Claim
27 words
A process for making a stencil as claimed in claim 11, wherein said heat-sublimable layer has a sublimation temperature higher than the melting temperature of said overcoat.
Claim 22
Dependent Claim
22 words
A process for making a stencil as claimed in claim 11, wherein said overcoat has a thickness of 2 to 15 μm.
Claim 23
Dependent Claim
23 words
A process for making a stencil as claimed in claim 11, wherein said heat-sublimable layer has a thickness of 2 to 15 μm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |