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US2487769A
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Assignee: OLSON FILTRATION ENGINEERS Inc
•
Filing: 1944-12-06
•
Granted: 1949-11-08
•
Expires: 1964-12-06
Abstract
No abstract record available.
Inventors
- 👤 Dwight L Ebert
- 👤 George E Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:53
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/50; B01D29/52; B01D29/44; B01D29/48; B01D37/00; B01D37/04
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) | 1952-11-07 | 1953-05-09 | 1953-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-07 | 1957-05-09 | 1957-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-07 | 1961-05-09 | 1961-11-08 | $7700.00 | Window Closed / Lapsed |