US2729652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of dehydracetic acid
Assignee: Bayer AG
•
Filing: 1954-04-22
•
Granted: 1956-01-03
•
Expires: 1974-04-22
Abstract
No abstract record available.
Inventors
- 👤 Nordt Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:10
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/34; C07D309/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
IN THE PROCESS FOR THE PRODUCTION OF DEHYDRACETIC ACID WHEREIN DIKETENE IS POLYMERIZED IN THE PRESENCE OF A BASIC POLYMERIZATION CATALYST, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE POLYMERIZATION IN ACETIC ANHYDRIDE AT TEMPERATURES WITHIN THE RANGE OF ABOUT 0*C. TO ABOUT 30*C.
Claim 2
Dependent Claim
43 words
IN THE PROCESS FOR THE PRODUCTION OF DEHYDRACETIC ACID WHEREIN DIKETENE IS POLYMERIZED IN THE PRESENCE OF A BASIC POLYMERIZATION CATALYST, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE POLYMERIZATION IN ACETIC ANHYDRIDE AT TEMPERATURES WITHIN THE RANGE OF ABOUT 0*C. TO ABOUT 30*C.
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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |