US3584576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive stencil sheet
Assignee: Ricoh Co Ltd
•
Filing: 1968-08-19
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Granted: 1971-06-15
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Expires: 1988-08-19
Abstract
Abstract A heat-sensitive stencil sheet consisting of a film adhered to a porous thin fibrous sheet and capable of being perforated by exposure to infrared rays, said film consisting essentially of at least 75 percent by weight of a chlorinated polyvinyl chloride resin having at least 20 percent by weight of recurring 1,1dichloroethylene units, not more than above 7 percent by weight of recurring 1,1-dichloroethylene units and the balance being polyvinyl chloride units.
Inventors
- 👤 Keishi Kubo
- 👤 Kiyoshi Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:30
CPC Classifications
B; B05; B05C; B05C17/00; B05C17/06; B41; B41N; B41N1/00; B41N1/24; B41N1/245; Y; Y10; Y10S; Y10S430/00; Y10S430/165
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
33 words
A heat-sensitive stencil sheet according to claim 1 in which said film contains up to 25 percent by weight of additives selected from the group consisting of fillers, stabilizers, plasticizers and coloring agents.
References Cited (Backward Citations)
US2808777A
Cited
US3267847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |