Patent US2831827A successfully refreshed from Google Patents.
US2831827A
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Interpolymers of acrylonitrile and a process of producing same
Assignee: BASF SE
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Filing: 1951-02-03
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Granted: 1958-04-22
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Expires: 1971-02-03
Abstract
No abstract record available.
Inventors
- 👤 Hopff Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:52
CPC Classifications
C; C08; C08F; C08F26/00; C08F26/06; C08F20/00; C08F20/02; C08F20/42; C08F220/00; C08F220/02; C08F220/42; C08F220/44; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
31 words
INTERPOLYMERS CONTAINING A PREPONDERATING AMOUNT OF ACRYLONITRILE UNITS AND A MINOR AMOUNT OF VINYL IMIDAZOLE UNITS SELECTED FROM THE GROUP CONSISTING OF 1-VINYL IMIDAZOLE, 1-VINYL ALKYL IMIDAZOLE, AND 1-VINYL PHENYL IMIDAZOLE.
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) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |