US3213069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of acrylonitrile polymers using a catalyst system of nitric acid and sulfur dioxide
Assignee: Bayer AG
•
Filing: 1962-05-09
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Granted: 1965-10-19
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Expires: 1982-05-09
Abstract
No abstract record available.
Inventors
- 👤 Rausch Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:00
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; C08F2/00; C08F2/12; C08F2/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
IN THE PROCESS FOR THE PRODUCTION OF ACRYLONITRILE POLYMERS BY STEPS COMPRISING POLYMERIZING ACRYLONITRILE IN AQUEOUS MEDIUM AT PH VALUES BELOW 7, THE IMPROVEMENT WHICH COMPRISES POLYMERIZING THE ACRYLONITRILE IN THE PRESENCE OF NITRIC ACID AND SULFURIC DIOXIDE AS CATALYST.
Claim 2
Dependent Claim
40 words
IN THE PROCESS FOR THE PRODUCTION OF ACRYLONITRILE POLYMERS BY STEPS COMPRISING POLYMERIZING ACRYLONITRILE IN AQUEOUS MEDIUM AT PH VALUES BELOW 7, THE IMPROVEMENT WHICH COMPRISES POLYMERIZING THE ACRYLONITRILE IN THE PRESENCE OF NITRIC ACID AND SULFURIC DIOXIDE AS CATALYST.
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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |