Patent US3489811A successfully refreshed from Google Patents.
US3489811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing odorless organic phosphines
Assignee: Wyeth Holdings LLC
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Filing: 1967-07-27
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Granted: 1970-01-13
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Expires: 1987-07-27
Abstract
No abstract record available.
Inventors
- 👤 Arnold Drucker
- 👤 Martin Grayson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:54
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/5004; A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/55; A61Q; A61Q5/00; A61Q5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2803597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |