US2901468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing nitrogen-containing polymerizates insoluble in water
Assignee: Wacker Chemie AG
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Filing: 1953-07-01
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Granted: 1959-08-25
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Expires: 1973-07-01
Abstract
No abstract record available.
Inventors
- 👤 Meinel Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:05
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
PROCESS FOR PRODUCING WATER INSOLUBLE NITROGEN CONTAINING POLYMERIZATES FROM A WATER SOLUBLE SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF POLYACRYLAMIDE AND COPOLYMERS OF POLYACRYLAMIDE AND POLYACRYLONITRILE, WHICH CONSISTS IN HEATING SAID SUBSTANCE TO A TEMPERATURE OF 100-250* C, IN A MIXTURE WITH A CARBOXYLIC ACID ANHYDRIDE ONLY UNTIL SAID SUBSTANCE BECOMES INSOLUBLE IN WATER.
Claim 2
Dependent Claim
54 words
PROCESS FOR PRODUCING WATER INSOLUBLE NITROGEN CONTAINING POLYMERIZATES FROM A WATER SOLUBLE SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF POLYACRYLAMIDE AND COPOLYMERS OF POLYACRYLAMIDE AND POLYACRYLONITRILE, WHICH CONSISTS IN HEATING SAID SUBSTANCE TO A TEMPERATURE OF 100-250* C, IN A MIXTURE WITH A CARBOXYLIC ACID ANHYDRIDE ONLY UNTIL SAID SUBSTANCE BECOMES INSOLUBLE IN WATER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |