Patent US3828016A successfully refreshed from Google Patents.
US3828016A
Expired / Lapsed
US
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Polymerization of vinylpyridine in the presence of small particles of ziegler catalyzed polyolefins or polystyrene
Assignee: Chevron USA Inc
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Filing: 1969-12-30
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Granted: 1974-08-06
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Expires: 1989-12-30
Abstract
Abstract VINYLPYRIDINE IS POLYMERIZED IN AQUEOUS SUSPENSION IN THE PRESENCE OF SMALL SOLID PARTICLES OF POLYOLEFIN.
Inventors
- 👤 R Bacskai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:31
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |