Patent US3819683A successfully refreshed from Google Patents.
US3819683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-acyl carbamate production
Assignee: Orica Ltd
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Filing: 1972-05-04
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Granted: 1974-06-25
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Expires: 1992-05-04
Abstract
Abstract PROCESS FOR THE PREPARATION OF N-ACYL AND N-AROYL CARBAMATES BY ACYLATION WITH AN ACID HALIDE.
Inventors
- 👤 H Krebs
- 👤 M Leeding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:22
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/91
Claims Analysis
Total Claims: 0
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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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |