US1990523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing methane
Assignee: Individual
•
Filing: 1932-06-09
•
Granted: 1935-02-12
•
Expires: 1952-06-09
Abstract
No abstract record available.
Inventors
- 👤 Arthur M Buswell
- 👤 Clair S Boruff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:35
CPC Classifications
C; C12; C12M; C12M45/00; C12M45/02; C12M21/00; C12M21/04; C12M23/00; C12M23/36; C12M27/00; C12M27/10; Y; Y02; Y02E; Y02E50/00; Y02E50/30; Y10; Y10S; Y10S435/00; Y10S435/801; Y10S435/8215; Y10S435/822
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1938-02-11 | 1938-08-13 | 1939-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-02-11 | 1942-08-13 | 1943-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-02-11 | 1946-08-13 | 1947-02-12 | $7700.00 | Window Closed / Lapsed |