US2677703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of bibenzyl dicarboxylic acids
Assignee: California Research LLC
•
Filing: 1950-09-26
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Granted: 1954-05-04
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Expires: 1970-09-26
Abstract
No abstract record available.
Inventors
- 👤 Jr William G Toland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:04
CPC Classifications
C; C07; C07C; C07C63/00; C07C63/33; C07C63/331; C07C63/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A PROCESS WHICH COMPRISES REACTING TOLUIC ACID AND SULFUR AT A TEMPERATURE OF FROM ABOUT 400 AND TO ABOUT 700* F. UNDER A PRESSURE OF HYDROGEN SULFIDE, SEPARATING BIBENZYL DICARBOXYLIC FROM THE REACTION PRODUCT.
Claim 2
Dependent Claim
34 words
A PROCESS WHICH COMPRISES REACTING TOLUIC ACID AND SULFUR AT A TEMPERATURE OF FROM ABOUT 400 AND TO ABOUT 700* F. UNDER A PRESSURE OF HYDROGEN SULFIDE, SEPARATING BIBENZYL DICARBOXYLIC FROM THE REACTION PRODUCT.
References Cited (Backward Citations)
US2610191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-03 | 1957-11-02 | 1958-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-03 | 1961-11-02 | 1962-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-03 | 1965-11-02 | 1966-05-04 | $7700.00 | Window Closed / Lapsed |