US2477872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ureas
Assignee: Shell Development Co
•
Filing: 1943-02-08
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Granted: 1949-08-02
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Expires: 1963-02-08
Abstract
No abstract record available.
Inventors
- 👤 Vernon E Haury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:49
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C06; C06B; C06B45/00; C06B45/18; C06B45/20; C06B45/28; C07; C07C; C07C273/00; C07C273/18; C07C273/1854; C07C273/1863; C10M2215/00; C10M2215/10; C10M2215/102; C10M2219/00; C10M2219/06; C10M2219/062; C10M2219/064
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) | 1952-08-01 | 1953-01-31 | 1953-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-01 | 1957-01-31 | 1957-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-01 | 1961-01-31 | 1961-08-02 | $7700.00 | Window Closed / Lapsed |