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Patent US2815376A successfully refreshed from Google Patents.
US2815376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of urea in granular form
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1955-04-18
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Granted: 1957-12-03
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Expires: 1975-04-18
Abstract
No abstract record available.
Inventors
- 👤 Knowlton Robert Ellis
- 👤 Macgregor Ian Archibald
- 👤 Evans Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:00
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2436771A
Cited
US2436766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-02 | 1961-06-03 | 1961-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-02 | 1965-06-03 | 1965-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-02 | 1969-06-03 | 1969-12-03 | $7700.00 | Window Closed / Lapsed |