US2537446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fused cyclic thiophenes
Assignee: Texaco Inc
•
Filing: 1948-04-23
•
Granted: 1951-01-09
•
Expires: 1968-04-23
Abstract
No abstract record available.
Inventors
- 👤 Lawrence W Devaney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:53
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/50; C07D333/52; C07D333/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A PROCESS FOR PREPARING FUSED CARBOCYCLIC DERIVATIVES OF THIOPHENE WHICH COMPRISES REACTING SULFUR WITH A CARBOCYCLIC COMPOUND CONTAINING AN ALIPHATIC SIDE CHAIN OF AT LEAST TWO CARBON ATOMS AND A HYDROGEN ATOM ON THE NUCLEAR CARBON ATOM ADJACENT TO THE ALIPHATIC CHAIN IN THE VAPOR PHASE AT AN ELEVATED TEMPERATURE BETWEEN 800 AND 1500* F.
Claim 2
Dependent Claim
55 words
A PROCESS FOR PREPARING FUSED CARBOCYCLIC DERIVATIVES OF THIOPHENE WHICH COMPRISES REACTING SULFUR WITH A CARBOCYCLIC COMPOUND CONTAINING AN ALIPHATIC SIDE CHAIN OF AT LEAST TWO CARBON ATOMS AND A HYDROGEN ATOM ON THE NUCLEAR CARBON ATOM ADJACENT TO THE ALIPHATIC CHAIN IN THE VAPOR PHASE AT AN ELEVATED TEMPERATURE BETWEEN 800 AND 1500* F.
References Cited (Backward Citations)
US1887156A
Cited
US1996334A
Cited
US1907274A
Cited
US2168840A
Cited
US2410401A
Cited
US2478914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |