US3669747A
Expired / Lapsed
US
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Heat-sensitive copy-sheet
Assignee: 3M Co
•
Filing: 1970-07-10
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Granted: 1972-06-13
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Expires: 1990-07-10
Abstract
Abstract AN INTEGRAL HEAT-SENSITIVE COPY SHEET CONTAINS A PROTONATABLE CHROMOGENOUS DYE-FORMING COLOR PROGENITOR AND A COCRYSTAL ADDUT OF AN ORGANIC AMINE AND VOLATILIZABLE ORGANIC ACID.
Inventors
- 👤 Geoffrey C Nicholson
- 👤 Donald J Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:55
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31797
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |