US3372085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble polyalkylenepolyamine/urethane resins and application thereof in production of wet strength paper
Assignee: Union Carbide Corp
•
Filing: 1965-04-14
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Granted: 1968-03-05
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Expires: 1985-04-14
Abstract
No abstract record available.
Inventors
- 👤 Paul M Westfall
- 👤 Nelson R Eldred
- 👤 John C Spicer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:28
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/56; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0809; C08G18/0814; C08G18/28; C08G18/30; C08G18/32; C08G18/3225; C08G18/3228; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/8064; D21H17/57; D21H21/00; D21H21/14; D21H21/18; D21H21/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2926116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |