US2841620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsaturated tertiary ethers and preparation thereof
Assignee: F Hoffmann La Roche AG
•
Filing: 1956-08-13
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Granted: 1958-07-01
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Expires: 1976-08-13
Abstract
No abstract record available.
Inventors
- 👤 Colaianni Louis Joseph
- 👤 Tanzer Martin Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:49
CPC Classifications
C; C11; C11B; C11B9/00; C07; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/673
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
A PROCESS WHICH COMPRISES REACTING A KETONE HAVING THE FORMULA
Claim 2
Dependent Claim
10 words
A PROCESS WHICH COMPRISES REACTING A KETONE HAVING THE FORMULA
References Cited (Backward Citations)
US2681938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |