Patent US3173287A successfully refreshed from Google Patents.
US3075007A
Expired / Lapsed
US
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Nitric acid oxidation of 1,1-diarylalkanes to produce carboxy substituted diaryl ketones
Assignee: Gulf Research and Development Co
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Filing: 1959-06-24
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Granted: 1963-01-22
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Expires: 1979-06-24
Abstract
No abstract record available.
Inventors
- 👤 John H Mccracken
- 👤 Johann G D Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:31
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/27; C07C45/28; C07C51/00; C07C51/16; C07C51/27; C07C51/275
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS FOR PREPARING DIARYLKETONE CARBOXYLIC ACIDS WHICH COMPRISES SUBJECTING TO OXIDATION WITH NITRIC ACID HAVING AN INITIAL CONCENTRATION OF ABOUT 5 TO ABOUT 70 PERCENT, AT A TEMPERATURE OF ABOUT 11* TO ABOUT 350* C, FOR ABOUT ONE MINUTE TO ABOUT 48 HOURS A 1,1-DIARYLALKANE REPRESENTED IN GENERAL BY THE FOLLOWING STRUCTURAL FORMULA:
Claim 2
Dependent Claim
54 words
A PROCESS FOR PREPARING DIARYLKETONE CARBOXYLIC ACIDS WHICH COMPRISES SUBJECTING TO OXIDATION WITH NITRIC ACID HAVING AN INITIAL CONCENTRATION OF ABOUT 5 TO ABOUT 70 PERCENT, AT A TEMPERATURE OF ABOUT 11* TO ABOUT 350* C, FOR ABOUT ONE MINUTE TO ABOUT 48 HOURS A 1,1-DIARYLALKANE REPRESENTED IN GENERAL BY THE FOLLOWING STRUCTURAL FORMULA:
References Cited (Backward Citations)
GB713812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |