US2776985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic phosphonic acid esterification catalysts
Assignee: Union Oil Company of California
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Filing: 1953-02-24
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Granted: 1957-01-08
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Expires: 1973-02-24
Abstract
No abstract record available.
Inventors
- 👤 Art C Mckinnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:57
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3882; C07F9/3834
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A METHOD FOR ESTERIFYING ORGANIC CARBOXYLIC ACID WITH AN ALCOHOL WHICH COMPRISES HEATING SAID CARBOXYLIC ACID AND SAID ALCOHOL AT A TEMPERATURE ABOVE ABOUT 200* C. IN THE PRESENCE OF CATALYTIC PROPORTIONS OF AN AROMATIC PHOSPHONIC ACID HAVING AT LEAST ONE ADDITIONAL ACID FUNCTION SELECTED FROM THE CLASS CONSISTING OF CARBOXYLIC SULFONIC, AND PHOSPHONIC AICD GROUPS.
Claim 2
Independent Claim
56 words
A METHOD FOR ESTERIFYING ORGANIC CARBOXYLIC ACID WITH AN ALCOHOL WHICH COMPRISES HEATING SAID CARBOXYLIC ACID AND SAID ALCOHOL AT A TEMPERATURE ABOVE ABOUT 200* C. IN THE PRESENCE OF CATALYTIC PROPORTIONS OF AN AROMATIC PHOSPHONIC ACID HAVING AT LEAST ONE ADDITIONAL ACID FUNCTION SELECTED FROM THE CLASS CONSISTING OF CARBOXYLIC SULFONIC, AND PHOSPHONIC AICD GROUPS.
References Cited (Backward Citations)
US2275494A
Cited
US2578312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |