US3030755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cleaning filter
Assignee: Farr Co
•
Filing: 1956-05-25
•
Granted: 1962-04-24
•
Expires: 1976-05-25
Abstract
No abstract record available.
Inventors
- 👤 Richard S Farr
- 👤 Allen W Hardy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:55
CPC Classifications
B; B04; B04C; B04C3/00; B04C3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1170438A
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US1743522A
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US2010128A
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US2320343A
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US2322414A
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FR891452A
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FR943392A
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US2480379A
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US2515894A
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GB676231A
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US2647588A
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GB701593A
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GB713930A
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US2806551A
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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) | 1965-04-23 | 1965-10-23 | 1966-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-23 | 1969-10-23 | 1970-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-23 | 1973-10-23 | 1974-04-24 | $7700.00 | Window Closed / Lapsed |