US2660580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of quinone compounds
Assignee: Wyeth Holdings LLC
•
Filing: 1951-01-03
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Granted: 1953-11-24
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Expires: 1971-01-03
Abstract
No abstract record available.
Inventors
- 👤 Von Isaiah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:34
CPC Classifications
C; C09; C09B; C09B9/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
43 words
A PROCESS OF REDUCING A QUINONE BY TREATING IT IN AN ORGANIC SOLVENT WITH HYDROGEN SULFIDE AND A METAL CHOSEN FROM THE GROUP CONSISTING OF NICKEL, COPPER AND SILVER, THE AMOUNT OF THE METAL BEING SUFFICIENT TO EFFECT SUBSTANTIAL REDUCTION OF THE QUINONE.
Claim 2
Dependent Claim
43 words
A PROCESS OF REDUCING A QUINONE BY TREATING IT IN AN ORGANIC SOLVENT WITH HYDROGEN SULFIDE AND A METAL CHOSEN FROM THE GROUP CONSISTING OF NICKEL, COPPER AND SILVER, THE AMOUNT OF THE METAL BEING SUFFICIENT TO EFFECT SUBSTANTIAL REDUCTION OF THE QUINONE.
Claim 3
Dependent Claim
34 words
A PROCESS ACCORDING TO CLAIM 1 IN WHICH THE LEUCO QUINONE OBTAINED IS REACTED WITHOUT ISOLATION WITH A SULFUR TRIOXIDE ADDITION PRODUCT OF A TERTIARY AMINE TO CONVERT IT TO ITS SULFURIC ACID HALF-ESTER.
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) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |