US2898375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic ketones and process for preparing intermediates therefor
Assignee: F Hoffmann La Roche AG
•
Filing: 1955-09-29
•
Granted: 1959-08-04
•
Expires: 1975-09-29
Abstract
No abstract record available.
Inventors
- 👤 Guex Waldemar
- 👤 Isler Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:51
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/14; C07C403/16; C07C45/00; C07C45/61; C07C45/62; C07C45/67; C07C45/673; C07C45/676; C07C45/78; C07C45/80; C07C45/81; C07C45/82; C07C49/00; C07C49/20; C07C49/203; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
5 words
A COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND HAVING THE FORMULA
Claim 3
Dependent Claim
12 words
A PROCESS WHICH COMPRISES HEATING AN ASUBSTITUTED ACETOACETATE HAVING THE GENERAL FORMULA
Claim 4
Dependent Claim
12 words
A PROCESS WHICH COMPRISES HEATING AN ASUBSTITUTED ACETOACETATE HAVING THE GENERAL FORMULA
References Cited (Backward Citations)
US2740847A
Cited
US2661368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |