US3587459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermographic stencil
Assignee: NRG Manufacturing Ltd
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Filing: 1968-07-23
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Granted: 1971-06-28
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Expires: 1988-07-23
Abstract
Abstract The invention provides a novel duplicating stencil comprising a backing sheet and attached to one edge thereof a thin sheet of thermoplastic film softening not above 250 degrees C. carrying a multiplicity of minute, closely spaced holes or artificially weakened areas. In use a heat absorbent image to be copied is placed in contact with the thermoplastic film and the assembly is exposed to heat, and the holes enlarge or the artificially weakened areas perforate in the image areas.
Inventors
- 👤 Alexander Spencer
- 👤 Alan Francis Blake
- 👤 David Guthrie Burns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:17
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/24; B41N1/245; Y; Y10; Y10T; Y10T83/00; Y10T83/02; Y10T83/0237
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |