US3539587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing cyclic ureas from n,n-dialkylammonium n,n-dialkyl monothiol carbamates and diprimaryamines
Assignee: Standard Oil Co
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Filing: 1967-11-13
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Granted: 1970-11-10
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Expires: 1987-11-13
Abstract
No abstract record available.
Inventors
- 👤 Edward A Swakon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:01
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/06; C07D239/08; C07D239/10; C07C; C07C273/00; C07C273/18; C07C273/1809; C07D209/00; C07D209/02; C07D209/44; C07D233/00; C07D233/04; C07D233/28; C07D233/30; C07D233/32; C07D233/34; C07D307/00; C07D307/02; C07D307/34; C07D307/38; C07D307/52; C08; C08G; C08G71/00; C08G71/02
Claims Analysis
Total Claims: 0
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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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |