Patent US2729675A successfully refreshed from Google Patents.
US2729675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing mercaptosuccinic acid
Assignee: Wyeth Holdings LLC
•
Filing: 1952-12-11
•
Granted: 1956-01-03
•
Expires: 1972-12-11
Abstract
No abstract record available.
Inventors
- 👤 Frank M Cowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:27
CPC Classifications
C; C07; C07C; C07C323/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A METHOD FOR THE PREPARATION OF MERCAPATOSUCCINIC ACID WHICH INCLUDES THE STEP OF HEATING AN O, O-DIALKYL DITHIOPHOSPHATOSUCCINIC ANHYDRIDE IN THE PRESENCE OF WATER AT A TEMPERATURE SUFFICIENT TO CAUSE EVOLUTION OF HYDROGEN SULFIDE.
Claim 2
Independent Claim
34 words
A METHOD FOR THE PREPARATION OF MERCAPATOSUCCINIC ACID WHICH INCLUDES THE STEP OF HEATING AN O, O-DIALKYL DITHIOPHOSPHATOSUCCINIC ANHYDRIDE IN THE PRESENCE OF WATER AT A TEMPERATURE SUFFICIENT TO CAUSE EVOLUTION OF HYDROGEN SULFIDE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |