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Patent US3371115A successfully refreshed from Google Patents.
US3371115A
Expired / Lapsed
US
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Process for combined production of ammonia and urea
Assignee: Chemical Construction Corp
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Filing: 1965-02-15
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Granted: 1968-02-27
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Expires: 1985-02-15
Abstract
No abstract record available.
Inventors
- 👤 Lucien H Cook
- 👤 Mavrovic Ivo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:24
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02; C01C1/04; C01C1/0405; C07; C07C; C07C273/00; C07C273/02; C07C273/10; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3303215A
Cited
US3310376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-26 | 1971-08-28 | 1972-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-26 | 1975-08-28 | 1976-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-26 | 1979-08-28 | 1980-02-27 | $7700.00 | Window Closed / Lapsed |