US2570542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphoric acid catalyzed thiophene alkylation and gravity separation of resultant products
Assignee: Universal Oil Products Co
•
Filing: 1947-03-12
•
Granted: 1951-10-09
•
Expires: 1967-03-12
Abstract
No abstract record available.
Inventors
- 👤 Curtis F Gerald
- 👤 George R Donaldson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:30
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/04; C07D333/06; C07D333/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN THE ART OF REACTING A THIOPHENE COMPOUND HAVING AT LEAST ONE REPLACEABLE HYDROGEN ATOM BOUND TO THE THIOPHENE RING, WHEREIN SAID HYDROGEN ATOM IS REPLACED BY A HYDROCARBON RADICAL AND THE REACTION EFFECTED IN THE PRESENCE OF A LIQUID CONDENSATION CATALYST WHICH IS SUBSTANTIALLY IMMISCIBLE WITH HYDROCARBONS AND THIOPHENE AND WHICH CONSISTS ESSENTIALLY OF 85% PHOSPHORIC ACID, THE METHOD OF RESOLVING THE CATALYST-CONTAINING REACTION MIXTURE FROM THE ZONE OF REACTION WHICH COMPRISES SUBJECTING SAID MIXTURE, PRIOR TO DISTILLATION THEREOF, TO AN INITIAL INCOMPLETE GRAVITY SETTLING FOR A TIME SUFFICIENT TO FORM A CATALYST PHASE AND A PHASE PREDOMINATING
Claim 2
Dependent Claim
99 words
IN THE ART OF REACTING A THIOPHENE COMPOUND HAVING AT LEAST ONE REPLACEABLE HYDROGEN ATOM BOUND TO THE THIOPHENE RING, WHEREIN SAID HYDROGEN ATOM IS REPLACED BY A HYDROCARBON RADICAL AND THE REACTION EFFECTED IN THE PRESENCE OF A LIQUID CONDENSATION CATALYST WHICH IS SUBSTANTIALLY IMMISCIBLE WITH HYDROCARBONS AND THIOPHENE AND WHICH CONSISTS ESSENTIALLY OF 85% PHOSPHORIC ACID, THE METHOD OF RESOLVING THE CATALYST-CONTAINING REACTION MIXTURE FROM THE ZONE OF REACTION WHICH COMPRISES SUBJECTING SAID MIXTURE, PRIOR TO DISTILLATION THEREOF, TO AN INITIAL INCOMPLETE GRAVITY SETTLING FOR A TIME SUFFICIENT TO FORM A CATALYST PHASE AND A PHASE PREDOMINATING
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) | 1954-10-08 | 1955-04-09 | 1955-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-08 | 1959-04-09 | 1959-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-08 | 1963-04-09 | 1963-10-09 | $7700.00 | Window Closed / Lapsed |