Patent US1915987A successfully refreshed from Google Patents.
US1915987A
Expired / Lapsed
US
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Method of cleaning gas
Assignee: Empire Oil & Refining Co
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Filing: 1930-08-06
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Granted: 1933-06-27
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Expires: 1950-08-06
Abstract
No abstract record available.
Inventors
- 👤 James P Fisher
- 👤 George F Downs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:28
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/02; B01D47/024; B01D47/028; Y; Y10; Y10S; Y10S55/00; Y10S55/25
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) | 1936-06-26 | 1936-12-26 | 1937-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-06-26 | 1940-12-26 | 1941-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-06-26 | 1944-12-26 | 1945-06-27 | $7700.00 | Window Closed / Lapsed |