US2653161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur and phosphorus-containing esters
Assignee: Shell Development Co
•
Filing: 1950-12-02
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Granted: 1953-09-22
•
Expires: 1970-12-02
Abstract
No abstract record available.
Inventors
- 👤 Seaver A Ballard
- 👤 Rupert C Morris
- 👤 John L Van Winkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:40
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/30; C07F9/32; C07F9/3258; C07F9/3264; C07F9/38; C07F9/40; C07F9/4071; C07F9/4075
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A PHOSPHONATE HAVING THE FORMULA
Claim 2
Dependent Claim
15 words
AN ESTER OF AN ORGANO-PHOSPHORUS ACID, SAID ESTER HAVING A STRUCTURE CORRESPONDING TO 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) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |