Patent US2581514A successfully refreshed from Google Patents.
US2581514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of thiasuccinic acid derivatives
Assignee: Standard Oil Co
•
Filing: 1949-11-30
•
Granted: 1952-01-08
•
Expires: 1969-11-30
Abstract
No abstract record available.
Inventors
- 👤 Wilbur B Chilcote
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:45
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C07; C07C; C07C323/00; C10M2219/00; C10M2219/08; C10M2219/082; C10M2219/085; C10N; C10N2010/00; C10N2010/06; C10N2010/08; C10N2030/00; C10N2030/12; C10N2050/00; C10N2050/10; Y; Y10; Y10S; Y10S528/00; Y10S528/931; Y10S528/934; Y10S528/937
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS FOR THE PRODUCTION OF A 2-(1-THIAALKYL) SUCCINIC ACID WHICH COMPRISES CONTACTING A SOLUTION OF AN ALKALI METAL MALEATE IN AN AQUEOUS ALKALI SELECTED FROM THE CLASS CONSISTING OF LIOH, NAOH AND KOH, SAID SOLUTION CONTAINING SUBSTANTIALLY NO ORGANIC SOLVENT, SAID SOLUTION CONTAINING AT LEAST ABOUT 1 MOL OF FREE ALKALI PER MOL OF SAID ALKALI METAL MALEATE, AT A TEMPERATURE BETWEEN ABOUT 75* C. AND ABOUT 125* C. WITH AN IMMISCIBLE, NON-TERTIARY, SATURATED, ALKYL THIOL CONTAINING BETWEEN ABOUT 1 AND ABOUT 30 CARBON ATOMS PER MOLECULE, AND SEPARATING A 2-(1-THIA-ALKYL) SUCCINIC ACID THUS PRODUCED.
Claim 2
Dependent Claim
96 words
A PROCESS FOR THE PRODUCTION OF A 2-(1-THIAALKYL) SUCCINIC ACID WHICH COMPRISES CONTACTING A SOLUTION OF AN ALKALI METAL MALEATE IN AN AQUEOUS ALKALI SELECTED FROM THE CLASS CONSISTING OF LIOH, NAOH AND KOH, SAID SOLUTION CONTAINING SUBSTANTIALLY NO ORGANIC SOLVENT, SAID SOLUTION CONTAINING AT LEAST ABOUT 1 MOL OF FREE ALKALI PER MOL OF SAID ALKALI METAL MALEATE, AT A TEMPERATURE BETWEEN ABOUT 75* C. AND ABOUT 125* C. WITH AN IMMISCIBLE, NON-TERTIARY, SATURATED, ALKYL THIOL CONTAINING BETWEEN ABOUT 1 AND ABOUT 30 CARBON ATOMS PER MOLECULE, AND SEPARATING A 2-(1-THIA-ALKYL) SUCCINIC ACID THUS PRODUCED.
References Cited (Backward Citations)
FR845793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |