US1471979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of nitrogenous fertilizers and the utilization of nitrogen-bearing solutions
Assignee: Individual
•
Filing: 1921-08-12
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Granted: 1923-10-23
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Expires: 1941-08-12
Abstract
No abstract record available.
Inventors
- 👤 Richards Eric Hannaford
- 👤 Hutchinson Henry Brougham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:43
CPC Classifications
C; C05; C05F; C05F17/00; C05C; C05C3/00; C05F11/00; Y; Y02; Y02P; Y02P20/00; Y02P20/141; Y02P20/145; Y02W; Y02W30/00; Y02W30/40
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) | 1926-10-22 | 1927-04-23 | 1927-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-10-22 | 1931-04-23 | 1931-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-10-22 | 1935-04-23 | 1935-10-23 | $7700.00 | Window Closed / Lapsed |