Patent US2959119A successfully refreshed from Google Patents.
Patent US3109856A successfully refreshed from Google Patents.
US3109856A
Expired / Lapsed
US
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Stabilization of acrylonitrile
Assignee: Wyeth Holdings LLC
•
Filing: 1959-10-30
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Granted: 1963-11-05
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Expires: 1979-10-30
Abstract
No abstract record available.
Inventors
- 👤 Rolland Calvin Charles
- 👤 Duncan Ronald Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:17
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/38
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
36 words
AS A COMPOSITION OF MATTER, A POLYMERIZATION STABILIZED ACRYLONITRILE HAVING PRESENT THEREIN A STABILIZING AMOUNT OF AMMONIA AND A COPPER CONCENTRATION OF ABOUT 0.01 TO ABOUT 0.2 PART PER MILLION BASED UPON THE WEIGHT OF ACRYLONITRILE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-11-04 | 1967-05-06 | 1967-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-04 | 1971-05-06 | 1971-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-04 | 1975-05-06 | 1975-11-05 | $7700.00 | Window Closed / Lapsed |