Patent US1188823A successfully refreshed from Google Patents.
US2861059A
Expired / Lapsed
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Hydrolysis of acrylonitrile-containing polymers
Assignee: Monsanto Chemicals Ltd
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Filing: 1953-11-23
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Granted: 1958-11-18
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Expires: 1973-11-23
Abstract
No abstract record available.
Inventors
- 👤 David T Mowry
- 👤 Eugene L Ringwald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:45
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
THE METHOD OF HYDROLYZING A POLYMER OF AT LEAST 90 PERCENT BY WEIGHT ACRYLONITRILE AND UP TO 10 PERCENT OF ANOTHER MONOMER COPOLYMERIZABLE WITH ACRYLONITRILE, WHICH COMPRISES HEATING THE SAID POLYMER WITH FROM 60 TO 120 PERCENT OF THE STOICHIOMETRIC EQUIVALENT OF AN ALKALI METAL HYDROXIDE (BASED ON THE NITRILE) WHILE THE POLYMER IS IN A PULVERULENT STATE DISPERSED IN A LIQUID MEDIUM OF WHICH 5 TO 50 PERCENT BY WEIGHT IS WATER AND 50 TO 95 PERCENT IS AN ALCOHOL OF THE FORMULA
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) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |