Patent US3744969A successfully refreshed from Google Patents.
US3744969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Break resistant leather
Assignee: Rohm and Haas Co
•
Filing: 1970-06-09
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Granted: 1973-07-10
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Expires: 1990-06-09
Abstract
Abstract MINERAL-TANNED LEATHER CAN BE PROVIDED WITH IMPROVED BREAK PROPERTIES AND IMPROVED DYEING CHARACTERISTICS BY THE IMPREGNATION THEREOF WITH CERTAIN NOVEL POLYAMPHOLYTE RESINS.
Inventors
- 👤 H Alps
- 👤 W Prentiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:15
CPC Classifications
C; C14; C14C; C14C9/00; C08; C08F; C08F20/00; C08F20/62; C14C3/00; C14C3/02; C14C3/28
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |