US3067251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tris(2-carbamoylethyl)phosphine oxide, derivatives thereof, and process for making same
Assignee: Wyeth Holdings LLC
•
Filing: 1961-04-07
•
Granted: 1962-12-04
•
Expires: 1981-04-07
Abstract
No abstract record available.
Inventors
- 👤 Michael M Rauhut
- 👤 Andrew M Semsel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:48
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/244; D06M13/282; D06M13/285; C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/53; C07F9/5304
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
7 words
A TERTIARY PHOSPHINE OXIDE OF THE FORMULA
Claim 2
Dependent Claim
7 words
A TERTIARY PHOSPHINE OXIDE OF THE FORMULA
Claim 3
Dependent Claim
1 words
FIG-01
Claim 4
Dependent Claim
1 words
FIG-01
References Cited (Backward Citations)
US2957931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-03 | 1966-06-04 | 1966-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-03 | 1970-06-04 | 1970-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-03 | 1974-06-04 | 1974-12-04 | $7700.00 | Window Closed / Lapsed |