Patent US1498031A successfully refreshed from Google Patents.
US1498031A
Expired / Lapsed
US
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Process for the production of ammonia
Assignee: Norsk Hydro Elektrisk Kvaelstof AS
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Filing: 1923-03-30
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Granted: 1924-06-17
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Expires: 1943-03-30
Abstract
No abstract record available.
Inventors
- 👤 Halvorsen Birger Fjeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:12
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02; C01C1/08; C01C3/00; C01C3/02; Y; Y10; Y10S; Y10S422/00; Y10S422/904
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) | 1927-06-17 | 1927-12-17 | 1928-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-06-17 | 1931-12-17 | 1932-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-06-17 | 1935-12-17 | 1936-06-17 | $7700.00 | Window Closed / Lapsed |