Patent US3792027A successfully refreshed from Google Patents.
US3792027A
Expired / Lapsed
US
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Novel copolymers
Assignee: Wyeth Holdings LLC
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Filing: 1971-04-14
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Granted: 1974-02-12
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Expires: 1991-04-14
Abstract
Abstract A NOVEL CLASS OF ACRYLAMIDE-SULFUR DIOXIDE POLYMERS, A METHOD FOR THEIR PRODUCTION GLYOXAL REACTION PRODUCTS THEREOF AND PAPER TREATED WITH SAID REACTION PRODUCTS, ARE DISCLOSED.
Inventors
- 👤 H Panzer
- 👤 W Firth
- 👤 A Coscia
- 👤 L Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:14
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45; C; C08; C08G; C08G75/00; C08G75/20; C08G75/205; C08G75/22; D21H17/37; D21H17/46; D21H17/58
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |