US2529498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of pentaenes
Assignee: F Hoffmann La Roche AG
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Filing: 1947-04-05
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Granted: 1950-11-14
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Expires: 1967-04-05
Abstract
No abstract record available.
Inventors
- 👤 Isler Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:02
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/06; C07C403/12; C07C403/08; C07C403/10; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
73 words
A PROCESS COMPRISING REACTING, BY MEANS OF A GRIGNARD REAGENT, B-IONONE WITH A GRIGNARD OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 1-HYDROXY-3-METHYL-HEXENE-(2)-YNE-(5) AND THE LOWER ALKYL ETHERS THEREOF, ADDING TO THE TRIPLE BOND OF THE CONDENSATION PRODUCT OBTAINED 1 MOL OF HYDROGEN BY PARTIAL HYDROGENATION, AND SUBJECTING THE COMPOUNDS THUS PRODUCED TO ESTERIFICATION AND ALKYL REARRANGEMENT BY MEANS OF AN ACYLATING AGENT, AND THEREAFTER SPLITTING OFF ACID FROM THE RESULTANT COMPOUND.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |