US3689302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermographically color-developable composition
Assignee: Ricoh Co Ltd
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Filing: 1970-10-20
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Granted: 1972-09-05
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Expires: 1990-10-20
Abstract
Abstract THERMOGRAPHICALLY COLOR-DEVELOPABLE COMPOSITIONS FOR USE IN THE PREPARATION OF HEAT-SENSITIVE COPY SHEETS AND HEAT-SENSITIVE STENCIL SHEETS CONTAINING FERROUS OR FERRIC SALTS OF HIGHER ALIPHATIC CARBOXYLIC ACIDS AND AT LEAST ONE SELECTED SEMICARBAZIDE DERIVATIVE.
Inventors
- 👤 Keishi Kubo
- 👤 Kiyoshi Sakai
- 👤 Takashi Sato
- 👤 Kuniaki Hakamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:43
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/333; B41M5/3333; B41M5/32; B41N; B41N1/00; B41N1/24; B41N1/242; B41M5/337; B41M5/3377
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |