US2585223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing beta-lactones employing a uranyl salt catalyst
Assignee: Eastman Kodak Co
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Filing: 1949-08-06
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Granted: 1952-02-12
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Expires: 1969-08-06
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:28
CPC Classifications
C; C07; C07D; C07D315/00; C07C; C07C51/00; C07C51/09; C07D305/00; C07D305/02; C07D305/10; C07D305/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A PROCESS FOR PREPARING A B-LACTONE COMPRISING REACTING KETENE (CH2=C=O) WITH A CARBONYL COMPOUND SELECTED FROM THE GROUP REPRESENTED BY THE FOLLOWING FOUR GENERAL FORMULAS:
Claim 2
Dependent Claim
25 words
A PROCESS FOR PREPARING A B-LACTONE COMPRISING REACTING KETENE (CH2=C=O) WITH A CARBONYL COMPOUND SELECTED FROM THE GROUP REPRESENTED BY THE FOLLOWING FOUR GENERAL FORMULAS:
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) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |