Patent US746589A successfully refreshed from Google Patents.
Patent US3595166A successfully refreshed from Google Patents.
US3595166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-layer stencil assembly having plastic overlay sheet
Assignee: Bell and Howell Co
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Filing: 1969-02-20
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Granted: 1971-07-27
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Expires: 1989-02-20
Abstract
Abstract There is disclosed an improvement in the mimeograph stencil art comprising the manufacture of an overlay sheet for either a conventional typewriter stencil or in particular a stencil which can be prepared by means of heat transfer with a thermocopier and with this overlay sheet is capable of either thermal production or conventional typewritten production, comprising a sheet of tissue which has been coated on one side, only, with a film of elastomeric plastic, such as polyvinyl chloride or polypropylene.
Inventors
- 👤 Herbert P Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:45
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/24; B41N1/248; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249962; Y10T428/249963; Y10T428/31504; Y10T428/31801; Y10T428/31804; Y10T428/31808; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
64 words
A mimeograph stencil assembly having a sandwichlike construction comprising: a first sheet; a second sheet positioned on said first sheet wherein said second sheet comprises a stencil layer; and a third sheet comprising a tissue layer having an elastomeric plastic film coated on one side thereof and wherein the uncoated side of said tissue layer is placed adjacent to and facing said stencil layer.
Claim 2
Dependent Claim
64 words
A mimeograph stencil assembly having a sandwichlike construction comprising: a first sheet; a second sheet positioned on said first sheet wherein said second sheet comprises a stencil layer; and a third sheet comprising a tissue layer having an elastomeric plastic film coated on one side thereof and wherein the uncoated side of said tissue layer is placed adjacent to and facing said stencil layer.
Claim 3
Dependent Claim
62 words
A mimeograph stencil assembly as in claim 1, wherein: said stencil layer comprises a tissue layer coated with a plasticized plastic coating having a melting point lower than said elastomeric plastic coating; and wherein said third sheet is adapted to absorb the coating of said stencil layer thereby forming apertures in said stencil layer upon the application of heat or pressure thereto.
Claim 4
Dependent Claim
29 words
The mimeograph stencil assembly of claim 2 wherein said third layer is adapted to provide a cushioning effect thereby protecting said stencil layer from excessive pressure being applied thereto.
Claim 5
Dependent Claim
72 words
A mimeograph stencil assembly as in claim 1, wherein: said second sheet comprises a tissue layer coated with plasticized material; and wherein said third sheet is adapted to absorb the coating of said stencil layer thereby forming apertures in said stencil layer upon the application of pressure thereto and wherein said third sheet further is adapted to provide a cushioning effect thereby protecting said stencil layer from excessive pressure being applied therEto.
Claim 6
Dependent Claim
17 words
The mimeograph stencil assembly of claim 4 wherein said plasticized coating material said stencil layer is nitrocellulose.
Claim 7
Dependent Claim
73 words
A mimeograph stencil assembly as in claim 1, wherein: said stencil layer comprises a tissue layer coated with a waxlike material; and wherein said third sheet is adapted to absorb the coating of said stencil layer thereby forming apertures in said stencil layer upon the application of pressure thereto and wherein said third sheet further is adapted to provide a cushioning effect thereby protecting said stencil layer from excessive pressure being applied thereto.
Claim 8
Dependent Claim
15 words
The mimeograph stencil assembly of claim 6 wherein said elastomeric plastic film is polyvinyl chloride.
Claim 9
Dependent Claim
14 words
The mimeograph stencil assembly of claim 6 wherein said elastomeric plastic film is polypropylene.
Claim 10
Dependent Claim
15 words
The mimeograph stencil assembly of claim 1 wherein said elastomeric plastic film is polyvinyl chloride.
Claim 11
Dependent Claim
14 words
The mimeograph stencil assembly of claim 1 wherein said elastomeric plastic film is polypropylene.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |