Patent US3270052A successfully refreshed from Google Patents.
US3270052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tris (2-carbamoylethyl)-phosphine and its methylol derivatives
Assignee: Individual
•
Filing: 1963-02-08
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Granted: 1966-08-30
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Expires: 1983-02-08
Abstract
No abstract record available.
Inventors
- 👤 Leon H Chance
- 👤 Wilson A Reeves
- 👤 Jr George L Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:43
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
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
3 words
TRIS(CARBAMOYLETHYL) PHOSPHINE, P(-CH2-CH2-CO-NH2)3
Claim 2
Dependent Claim
3 words
TRIS(CARBAMOYLETHYL) PHOSPHINE, P(-CH2-CH2-CO-NH2)3
References Cited (Backward Citations)
US2203493A
Cited
US2234889A
Cited
US2961465A
Cited
US3005013A
Cited
US3052719A
Cited
US3067251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |