US2212752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for removing foreign material from air
Assignee: SCHMIEG SHEET METAL WORKS
•
Filing: 1937-04-12
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Granted: 1940-08-27
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Expires: 1957-04-12
Abstract
No abstract record available.
Inventors
- 👤 John D Schmieg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:47
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06; B01D47/08; B01D47/085; Y; Y10; Y10S; Y10S118/00; Y10S118/07; Y10S261/00; Y10S261/54; Y10S55/00; Y10S55/46
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) | 1943-08-27 | 1944-02-26 | 1944-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-08-27 | 1948-02-26 | 1948-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-08-27 | 1952-02-26 | 1952-08-27 | $7700.00 | Window Closed / Lapsed |