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Patent US3420798A successfully refreshed from Google Patents.
US3420798A
Expired / Lapsed
US
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Cross-linked polymers of lactonized poly (methyl propenol/methacrylic acid) and method of preparing by applying heat
Assignee: Gulf Oil Corp
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Filing: 1965-06-23
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Granted: 1969-01-07
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Expires: 1985-06-23
Abstract
No abstract record available.
Inventors
- 👤 Wayne E Smith
- 👤 Dru W Alwani
- 👤 Harry D Anspon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:47
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/14; C08G2/18; C08G2/24; C08G2/30; D; D01; D01F; D01F6/00; D01F6/02; D01F6/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB803053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |