Patent US3157685A successfully refreshed from Google Patents.
US3157685A
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Partial esters of phosphoric acid and a method of preparing them
Assignee: Stauffer Chemical Co
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Filing: 1962-03-06
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Granted: 1964-11-17
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Expires: 1982-03-06
Abstract
No abstract record available.
Inventors
- 👤 Szabo Karoly
- 👤 Jr Joseph R Froli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:06
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/12; C07F9/113; C07F9/22; C07F9/24; C07F9/2404; C07F9/242
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A METHOD OF PREPARING A DIESTER PHOSPHATE AS REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Independent Claim
14 words
A METHOD OF PREPARING A DIESTER PHOSPHATE AS REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
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Cited
US2892751A
Cited
US3027296A
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US2922739A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |