US2661368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of disubstituted propargyl acetoacetates and decarboxylation of same
Assignee: F Hoffmann La Roche AG
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Filing: 1952-05-15
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Granted: 1953-12-01
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Expires: 1972-05-15
Abstract
No abstract record available.
Inventors
- 👤 Kimel Walter
- 👤 Sax Norbert William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:45
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A METHOD WHICH COMPRISES CONDENSING DIKETENE WITH A DISUBSTITUTED PROPARGYL ALCOHOL WHEREIN EACH SUBSTITUENT IS A HYDROCARBON RADICAL SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL AND LOWER ALKENYL RADICALS AND IS ATTACHED TO THE 1-CARBON ATOM OF THE PROPARGYL RADICAL AND ELEMINATING CARBON DIOXIDE FROM THE CONDENSATION PRODUCT.
Claim 2
Independent Claim
49 words
A METHOD WHICH COMPRISES CONDENSING DIKETENE WITH A DISUBSTITUTED PROPARGYL ALCOHOL WHEREIN EACH SUBSTITUENT IS A HYDROCARBON RADICAL SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL AND LOWER ALKENYL RADICALS AND IS ATTACHED TO THE 1-CARBON ATOM OF THE PROPARGYL RADICAL AND ELEMINATING CARBON DIOXIDE FROM THE CONDENSATION PRODUCT.
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) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |