Patent US2662920A successfully refreshed from Google Patents.
US2662920A
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Process for preparing 2, 3-dimethylheptene-2-one-6
Assignee: F Hoffmann La Roche AG
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Filing: 1952-11-29
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Granted: 1953-12-15
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Expires: 1972-11-29
Abstract
No abstract record available.
Inventors
- 👤 Kimel Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:44
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/20; C07C49/203; C07C45/00; C07C45/61; C07C45/67; C07C45/673; C07C45/676
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
A PROCESS WHICH COMPRISES CONDENSING DIKETENE WITH 2,3-DIMETHYL-BUTEN-3-OL-2 AND DECARBOXYLATING THE CONDENSATION PRODUCT TO PRODUCE 2,3-DIMETHYL-HEPTEN-2-ONE-6.
Claim 2
Dependent Claim
16 words
A PROCESS WHICH COMPRISES CONDENSING DIKETENE WITH 2,3-DIMETHYL-BUTEN-3-OL-2 AND DECARBOXYLATING THE CONDENSATION PRODUCT TO PRODUCE 2,3-DIMETHYL-HEPTEN-2-ONE-6.
References Cited (Backward Citations)
GB646962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-14 | 1957-06-15 | 1957-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-14 | 1961-06-15 | 1961-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-14 | 1965-06-15 | 1965-12-15 | $7700.00 | Window Closed / Lapsed |