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US3663535A
Expired / Lapsed
US
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4-acyloxy-azetidine-2-ones
Assignee: Rolland Inc
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Filing: 1970-01-23
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Granted: 1972-05-16
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Expires: 1990-01-23
Abstract
Abstract 4-ACYLOXY-AZETIDINE-2-ONES ARE OBTAINED BY REACTING VINYL ESTERS WITH CHLOROSULFONYL ISOCYANATE. THE PRODUCTS ARE STARTING COMPOUNDS FOR SYNTHESES OF COMPOUNDS CONTAINING THE B-LACTAM RING AND ARE USEFUL AS ACID-YIELDING AGENTS, ESPECIALLY FOR PRINTING INKS.
Inventors
- 👤 Herbert Bestian
- 👤 Dieter Grimm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:25
CPC Classifications
C; C07; C07D; C07D205/00; C07D205/02; C07D205/06; C07D205/08; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/918
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |