Patent US2540988A successfully refreshed from Google Patents.
US2540988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-keto-1,3-benzodioxane derivatives
Assignee: Monsanto Chemicals Ltd
•
Filing: 1946-06-19
•
Granted: 1951-02-06
•
Expires: 1966-06-19
Abstract
No abstract record available.
Inventors
- 👤 David T Mowry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:26
CPC Classifications
C; C07; C07D; C07D319/00; C07D319/04; C07D319/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
THE PROCESS WHICH COMPRISES MIXING SALICYLIC ACID WITH BENZAL DIACETATE AND HEATING THE MIXTURE UNDER A REFLUX IN THE PRESENCE OF AN ACIDIC SUBSTANCE AND RECOVERING 2-PHENYL-4-KETO-1,3BENZODIOXANE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
31 words
THE PROCESS WHICH COMPRISES MIXING SALICYLIC ACID WITH BENZAL DIACETATE AND HEATING THE MIXTURE UNDER A REFLUX IN THE PRESENCE OF AN ACIDIC SUBSTANCE AND RECOVERING 2-PHENYL-4-KETO-1,3BENZODIOXANE FROM THE REACTION MIXTURE.
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) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |