Patent US3784597A successfully refreshed from Google Patents.
US3784597A
Expired / Lapsed
US
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Process for producing a partially hydrolyzed acrylamide polymer
Assignee: Sanyo Chemical Industries Ltd
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Filing: 1971-12-16
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Granted: 1974-01-08
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Expires: 1991-12-16
Abstract
Abstract ACRYLAMIDE POLYMERS AND COPOLYMERS ARE PARTIALLY HYDROLYZED IN AN EXTRUDER FROM HIGH CONCENTRATION GEL-LIKE AQUEOUS MEDIUM.
Inventors
- 👤 T Fujimoto
- 👤 S Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:06
CPC Classifications
C; C08; C08F; C08F8/00
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |