US1824713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for cleaning gas
Assignee: Empire Oil & Refining Co
•
Filing: 1927-06-10
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Granted: 1931-09-22
•
Expires: 1947-06-10
Abstract
No abstract record available.
Inventors
- 👤 James P Fisher
- 👤 George F Downs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:33
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/02; C10K1/024; B; B01; B01D; B01D50/00; B01D50/40; Y; Y10; Y10S; Y10S15/00; Y10S15/08
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) | 1934-09-21 | 1935-03-23 | 1935-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-09-21 | 1939-03-23 | 1939-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-09-21 | 1943-03-23 | 1943-09-22 | $7700.00 | Window Closed / Lapsed |