US3251883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing 2-hydroxyalkylphosphines and 2-hydroxyalkylphosphonium salts
Assignee: Wyeth Holdings LLC
•
Filing: 1962-07-20
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Granted: 1966-05-17
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Expires: 1982-07-20
Abstract
No abstract record available.
Inventors
- 👤 Michael M Rauhut
- 👤 Andrew M Semsel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:32
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/244; D06M13/282; D06M13/285; C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/5004; C07F9/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A 2-HYDROXYALKYLPHOSPHONIUM SALT OF THE FORMULA
Claim 2
Dependent Claim
6 words
A 2-HYDROXYALKYLPHOSPHONIUM SALT OF 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) | 1969-05-16 | 1969-11-15 | 1970-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-16 | 1973-11-15 | 1974-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-16 | 1977-11-15 | 1978-05-17 | $7700.00 | Window Closed / Lapsed |