US2841594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of beta-furoic acids
Assignee: —
•
Filing: —
•
Granted: 1958-07-01
•
Expires: 1975-07-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:08
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/56; C07D307/68; C07D491/00; C07D491/02; C07D491/04; C07D493/00; C07D493/02; C07D493/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS FOR THE PRODUCTION OF A BETA-FUROIC ACID WHICH COMPRISES HEATING AN UNSATURATED LACTONE AT AN ELEVATED TEMPERATURE IN THE PRESENCE OF A STRONG ACIDIC CATALYST SELECTED FROM THE GROUP CONSISTING OF STRONG MINERAL ACIDS AND FRIEDEL-CRAFTS HALIDE CATALYSTS, SAID LACTONE HAVING THE STRUCTURAL FORMULA
Claim 2
Dependent Claim
46 words
A PROCESS FOR THE PRODUCTION OF A BETA-FUROIC ACID WHICH COMPRISES HEATING AN UNSATURATED LACTONE AT AN ELEVATED TEMPERATURE IN THE PRESENCE OF A STRONG ACIDIC CATALYST SELECTED FROM THE GROUP CONSISTING OF STRONG MINERAL ACIDS AND FRIEDEL-CRAFTS HALIDE CATALYSTS, SAID LACTONE HAVING THE STRUCTURAL FORMULA
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) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |