US2953596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of secondary phosphine oxides
Assignee: Wyeth Holdings LLC
•
Filing: 1958-07-31
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Granted: 1960-09-20
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Expires: 1978-07-31
Abstract
No abstract record available.
Inventors
- 👤 Michael M Rauhut
- 👤 Hechenbleikner Ingenuin
- 👤 Helen A Currier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:14
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/46; C07F9/50; C07F9/53; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/26; C10L1/2608
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A PROCESS WHICH COMPRISES REACTING A SECONDARY PHOSPHINE CORRESPONDING TO THE FORMULA
Claim 2
Dependent Claim
12 words
A PROCESS WHICH COMPRISES REACTING A SECONDARY PHOSPHINE CORRESPONDING TO THE FORMULA
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) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |