US1815243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making ammonia by catalysis
Assignee: ATMOSPHERIC NITROGEN Corp
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Filing: 1923-05-12
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Granted: 1931-07-21
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Expires: 1943-05-12
Abstract
No abstract record available.
Inventors
- 👤 Jahn Fredrik W De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:31
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/025
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) | 1934-07-20 | 1935-01-19 | 1935-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-07-20 | 1939-01-19 | 1939-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-07-20 | 1943-01-19 | 1943-07-21 | $7700.00 | Window Closed / Lapsed |