Patent US2880239A successfully refreshed from Google Patents.
US2880239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New chemical compounds
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1956-01-30
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Granted: 1959-03-31
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Expires: 1976-01-30
Abstract
No abstract record available.
Inventors
- 👤 Semmens Peter William Brett
- 👤 Summers-Smith James Denis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:35
CPC Classifications
C; C07; C07C; C07C211/00; C07C211/62; C07C211/63; C10; C10M; C10M105/00; C10M105/56; C10M105/58; C10M105/60; C10M2215/00; C10M2215/02; C10M2215/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
DI-(CETHYL TRIMETHYL AMMONIUM) DIHYDROGEN PYROPHOSPHATE.
Claim 2
Dependent Claim
5 words
DI-(CETHYL TRIMETHYL AMMONIUM) DIHYDROGEN PYROPHOSPHATE.
References Cited (Backward Citations)
US2396278A
Cited
US2295505A
Cited
US2676986A
Cited
US2576644A
Cited
US2700684A
Cited
US2700683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-30 | 1962-09-29 | 1963-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-30 | 1966-09-29 | 1967-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-30 | 1970-09-29 | 1971-03-31 | $7700.00 | Window Closed / Lapsed |