US3061612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thioester production
Assignee: California Research LLC
•
Filing: 1959-03-24
•
Granted: 1962-10-30
•
Expires: 1979-03-24
Abstract
No abstract record available.
Inventors
- 👤 William G Toland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:16
CPC Classifications
C; C07; C07C; C07C327/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
2 words
4,5-DICARBOXY THIOPHTHALIDE.
Claim 2
Dependent Claim
2 words
4,5-DICARBOXY THIOPHTHALIDE.
Claim 3
Dependent Claim
110 words
THE PROCESS OF PREPARING A PRIMARY THIOESTER WHICH COMPRISES PRODUCING A REACTION MIXTURE BY REACHING HYDROGEN SULFIDE AT ABOUT 300 TO 700*F. AND A PRESSURE FROM 100 TO 5,000 P.S.I.G. WITH AN ACUD ANHYDRIDE SELECTED FROM THE GROUP CONSISTING OF (A) ANHYDRIDES OF SATURATED ALIPHATIC MONOCARBOXYLIC ACIDS OF 2 TO 15 CARBON ATOMS PER MOLECULE, (B) CYCLIC ANHYDRIDES OF DICARBOXYLIC ACIDS OF 4 TO 6 CARBON ATOMS PER MOLECULE, (C) ANHYDRIDES OF MONONUCLEAR ARYL CARBOXYLIC ACIDS OF 1 TO 6 CARBOXYLIC GROUPS PER MOLECULE, AND (D) ANHYDRIDES OF CYCLOHEXANE CARBOXYLIC ACIDS OF 1 TO 2 CARBOXYL GROUPS PER MOLECULE; AND SEPARATING FROM SAID REACTION MIXTURE A PRODUCT COMPRISING SAID THIOESTER.
Claim 4
Dependent Claim
110 words
THE PROCESS OF PREPARING A PRIMARY THIOESTER WHICH COMPRISES PRODUCING A REACTION MIXTURE BY REACHING HYDROGEN SULFIDE AT ABOUT 300 TO 700*F. AND A PRESSURE FROM 100 TO 5,000 P.S.I.G. WITH AN ACUD ANHYDRIDE SELECTED FROM THE GROUP CONSISTING OF (A) ANHYDRIDES OF SATURATED ALIPHATIC MONOCARBOXYLIC ACIDS OF 2 TO 15 CARBON ATOMS PER MOLECULE, (B) CYCLIC ANHYDRIDES OF DICARBOXYLIC ACIDS OF 4 TO 6 CARBON ATOMS PER MOLECULE, (C) ANHYDRIDES OF MONONUCLEAR ARYL CARBOXYLIC ACIDS OF 1 TO 6 CARBOXYLIC GROUPS PER MOLECULE, AND (D) ANHYDRIDES OF CYCLOHEXANE CARBOXYLIC ACIDS OF 1 TO 2 CARBOXYL GROUPS PER MOLECULE; AND SEPARATING FROM SAID REACTION MIXTURE A PRODUCT COMPRISING SAID THIOESTER.
References Cited (Backward Citations)
DE800412C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-29 | 1966-04-30 | 1966-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-29 | 1970-04-30 | 1970-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-29 | 1974-04-30 | 1974-10-30 | $7700.00 | Window Closed / Lapsed |