Patent US2666527A successfully refreshed from Google Patents.
US2666527A
Expired / Lapsed
US
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Method of promoting filtration
Assignee: Peterson Filters and Engineering Co
•
Filing: 1945-06-22
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Granted: 1954-01-19
•
Expires: 1965-06-22
Abstract
No abstract record available.
Inventors
- 👤 Peterson C Lynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:24
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/03; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1986291A
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US2313741A
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US2394083A
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US2437265A
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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) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |