US2726256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organo-phosphorus esters
Assignee: Shell Development Co
•
Filing: 1952-03-25
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Granted: 1955-12-06
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Expires: 1972-03-25
Abstract
No abstract record available.
Inventors
- 👤 Rupert C Morris
- 👤 John L Van Winkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:46
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C23F11/1676; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/30; C07F9/32; C10; C10M; C10M1/00; C10M1/08; C10M2223/00; C10M2223/06; C10M2223/065; C10N; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A DIPHOSPHNATE HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
6 words
A DIPHOSPHNATE HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-05 | 1959-06-06 | 1959-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-05 | 1963-06-06 | 1963-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-05 | 1967-06-06 | 1967-12-06 | $7700.00 | Window Closed / Lapsed |