US2705728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of unsaturated alicyclic 2-methylbutanal compounds
Assignee: F Hoffmann La Roche AG
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Filing: 1952-05-17
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Granted: 1955-04-05
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Expires: 1972-05-17
Abstract
No abstract record available.
Inventors
- 👤 Inhoffen Hans Herloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:51
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/06; C07C403/10; C07C403/08; C07C403/14; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
17 words
A PROCESS WHICH COMPRISES DEHYDRATING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THOSE HAVING THE FORMULAE
Claim 2
Dependent Claim
17 words
A PROCESS WHICH COMPRISES DEHYDRATING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THOSE HAVING THE FORMULAE
Claim 3
Dependent Claim
55 words
A PROCESS WHICH COMPRISES HEATING 1-METHOXY-2HYDROXY - 2 - METHYL - 4 - (1''- HYDROXY - 2,6,6-TRIMETHYLHEXYL)-BUTENE-(3) IN STRONGLY ACID MEDIUM TO PRODUCE AN UNSATURATED ALDEHYDE HAVING THE SAME CARBON SKELETON AS THE STARTING MATERIAL BUT HAVING TWO DOUBLE BONDS AND HAVING AN ULTRAVIOLET MAXIMUM AT ABOUT 294MU AND AN ULTRAVIOLET MINIMUM AT ABOUT 245MU.
Claim 4
Dependent Claim
55 words
A PROCESS WHICH COMPRISES HEATING 1-METHOXY-2HYDROXY - 2 - METHYL - 4 - (1''- HYDROXY - 2,6,6-TRIMETHYLHEXYL)-BUTENE-(3) IN STRONGLY ACID MEDIUM TO PRODUCE AN UNSATURATED ALDEHYDE HAVING THE SAME CARBON SKELETON AS THE STARTING MATERIAL BUT HAVING TWO DOUBLE BONDS AND HAVING AN ULTRAVIOLET MAXIMUM AT ABOUT 294MU AND AN ULTRAVIOLET MINIMUM AT ABOUT 245MU.
References Cited (Backward Citations)
US2591811A
Cited
US2614124A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-04 | 1958-10-04 | 1959-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-04 | 1962-10-04 | 1963-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-04 | 1966-10-04 | 1967-04-05 | $7700.00 | Window Closed / Lapsed |