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Patent US2888485A successfully refreshed from Google Patents.
US2888485A
Expired / Lapsed
US
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Preparation of diphenic acid
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1956-05-14
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Granted: 1959-05-26
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Expires: 1976-05-14
Abstract
No abstract record available.
Inventors
- 👤 Philip S Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:42
CPC Classifications
C; C07; C07C; C07C63/00; C07C63/33; C07C63/331; C07C45/00; C07C45/51; C07C45/53; C07C47/00; C07C47/52; C07C47/546
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A PROCESS FOR PREPARING A 2,2''-BIARYLDICARBOXYLIC ACID WHICH COMPRISES THE STEPS OF BRINGING INTO CONTACT WITH A CHEMICAL REDUCING AGENT IN SOLUTION IN A POLAR ORGANIC SOLVENT AT A TEMPERATURE WITHIN THE RANGE OF ABOUT -100* TO ABOUT 30*C. A COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
44 words
A PROCESS FOR PREPARING A 2,2''-BIARYLDICARBOXYLIC ACID WHICH COMPRISES THE STEPS OF BRINGING INTO CONTACT WITH A CHEMICAL REDUCING AGENT IN SOLUTION IN A POLAR ORGANIC SOLVENT AT A TEMPERATURE WITHIN THE RANGE OF ABOUT -100* TO ABOUT 30*C. A COMPOUND HAVING THE 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) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |