Patent US2804165A successfully refreshed from Google Patents.
US2804165A
Expired / Lapsed
US
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Arrangement for replacing filters
Assignee: Individual
•
Filing: 1956-09-28
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Granted: 1957-08-27
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Expires: 1976-09-28
Abstract
No abstract record available.
Inventors
- 👤 Roland A Blomgren
- 👤 Nils J G Bohlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:51
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/02; B; B01; B01D; B01D46/00; B01D46/10; B01D46/88; G21F7/00; G21F7/015; Y; Y10; Y10S; Y10S55/00; Y10S55/09
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |