US2797235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tertiary esters and preparation thereof
Assignee: F Hoffmann La Roche AG
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Filing: 1954-09-01
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Granted: 1957-06-25
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Expires: 1974-09-01
Abstract
No abstract record available.
Inventors
- 👤 James A Birbiglia
- 👤 George O Chase
- 👤 Galender Julius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:34
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/61; C07C45/67; C07C67/00; C07C67/28; C07C67/283; C07C69/00; C07C69/02; C07C69/12; C07C69/14; C07C69/145
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
43 words
AN ESTER OF LOWER ALKANOIC ACID WITH A TRISUBSTITUTED CARBINOL WHEREIN ONE SUBSTITUENT IS THE ETHYNL RADICAL, A SECOND SUBSTITUENT IS THE METHYL RADICAL, AND A THIRD SUBSTITUENT IS A MONOVALENT RADICAL SELECTED FROM THE CLASS CONSISTING OF ISOPRENOID RADICALS HAVING THE FORMULA
References Cited (Backward Citations)
US2423545A
Cited
CH261120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-24 | 1960-12-24 | 1961-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-24 | 1964-12-24 | 1965-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-24 | 1968-12-24 | 1969-06-25 | $7700.00 | Window Closed / Lapsed |