Patent US1897372A successfully refreshed from Google Patents.
US1897372A
Expired / Lapsed
US
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Air cleaner
Assignee: Vortox Manufacturing Co
•
Filing: 1930-03-03
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Granted: 1933-02-14
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Expires: 1950-03-03
Abstract
No abstract record available.
Inventors
- 👤 Herman H Garner
- 👤 Fred R Nohavec
- 👤 Hopkins George Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:32
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/026; Y; Y10; Y10S; Y10S55/00; Y10S55/27
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) | 1936-02-14 | 1936-08-15 | 1937-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-02-14 | 1940-08-15 | 1941-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-02-14 | 1944-08-15 | 1945-02-14 | $7700.00 | Window Closed / Lapsed |