US3535308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of partially esterified polyhydroxylic polymers
Assignee: Wyeth Holdings LLC
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Filing: 1968-01-15
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Granted: 1970-10-20
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Expires: 1988-01-15
Abstract
No abstract record available.
Inventors
- 👤 Frederic Charles Schaefer
- 👤 William Douglas Zimmermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:39
CPC Classifications
C; C08; C08B; C08B37/00; C08B1/00; C08B1/02; C08B3/00; C08B3/12; C08B3/14; C08B31/00; C08B31/02; C08B31/04; D; D01; D01F; D01F11/00; D01F11/02
Claims Analysis
Total Claims: 0
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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) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |