Patent US3170285A successfully refreshed from Google Patents.
US3909221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering device
Assignee: Individual
•
Filing: 1974-02-25
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Granted: 1975-09-30
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Expires: 1994-02-25
Abstract
Abstract A filter device comprising a housing having a filter element and a removeable cap for allowing replacement of the filter element. A valve means is provided in the housing, said valve means having a valve body which, in a first position, allows a medium flow from the inlet to the outlet of the housing via the filter. Upon removal of the filter element, the valve body is automatically moved to a second position in which it establishes a by-pass passageway to allow a medium flow from the inlet to the outlet past the filter.
Inventors
- 👤 Goran Vilhelm Bengtsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:17
CPC Classifications
F; F25; F25B; F25B43/00; F25B43/003; B; B01; B01D; B01D29/00; B01D29/96; B01D35/00; B01D35/14; B01D35/153
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
A FILTER DEVICE COMPRISING: A FILTER ELEMENT, A HOLLOW CYLINDRICAL HOUSING HAVING INLET AND OUTLET OPEN INGS AND A CHANNEL BETWEEN THE OPENINGS RECEIVING SAID FILTER ELEMENT, A PISTON DISPLACEABLE IN SAID HOUSING SAID PISTON INCLUDING TWO PASSAGES EXTENDING INWARDLY FROM ITS PRIPHERAL SURFACE FOR EXTABLISHING COMMUNICATION BETWEEN THE INLET AND OUTLET OPENINGS THROUGH THE FILTER ELEMENT CHANNEL A CAP FOR SEALING THE CHANNEL OF THE HOUSING AND FOR PERMITTING REMOVAL AND REPLACEMENT OF THE FILTER ELEMENT, AND SPRING MEANS DISPOSED IN SAID HOUSING AND URGING SAID PISTON IN A DIRECTION TOWARDS THE FILTER ELEMENT, SO THAT WHEN THE FILTER ELEMENT IS REMOVED BY REMOVING SAID CAP FROM THE CHANNEL OF SAID HOUSING SAID SPRING WILL DISPLACE SAID PISTON TO PREVENT THE INLET AND OUTLET OPENINGS FROM BEING IN FLOW COMMUNICATION WITH THE CHANNEL, SAID PISTON BEING PROVIDED WITH A CROSS BORE SITUATED AT AN AXIAL DISTANCE FROM SAID INLET AND OUTLET OPENINGS WHEN THE FILTER IS IN SAID CHANNEL SAID CROSS BORE ESTABLISHING DIRECT COMMUNICATION BETWEEN THE INLET AND THE OUTLET
Claim 2
Dependent Claim
172 words
A FILTER DEVICE COMPRISING: A FILTER ELEMENT, A HOLLOW CYLINDRICAL HOUSING HAVING INLET AND OUTLET OPEN INGS AND A CHANNEL BETWEEN THE OPENINGS RECEIVING SAID FILTER ELEMENT, A PISTON DISPLACEABLE IN SAID HOUSING SAID PISTON INCLUDING TWO PASSAGES EXTENDING INWARDLY FROM ITS PRIPHERAL SURFACE FOR EXTABLISHING COMMUNICATION BETWEEN THE INLET AND OUTLET OPENINGS THROUGH THE FILTER ELEMENT CHANNEL A CAP FOR SEALING THE CHANNEL OF THE HOUSING AND FOR PERMITTING REMOVAL AND REPLACEMENT OF THE FILTER ELEMENT, AND SPRING MEANS DISPOSED IN SAID HOUSING AND URGING SAID PISTON IN A DIRECTION TOWARDS THE FILTER ELEMENT, SO THAT WHEN THE FILTER ELEMENT IS REMOVED BY REMOVING SAID CAP FROM THE CHANNEL OF SAID HOUSING SAID SPRING WILL DISPLACE SAID PISTON TO PREVENT THE INLET AND OUTLET OPENINGS FROM BEING IN FLOW COMMUNICATION WITH THE CHANNEL, SAID PISTON BEING PROVIDED WITH A CROSS BORE SITUATED AT AN AXIAL DISTANCE FROM SAID INLET AND OUTLET OPENINGS WHEN THE FILTER IS IN SAID CHANNEL SAID CROSS BORE ESTABLISHING DIRECT COMMUNICATION BETWEEN THE INLET AND THE OUTLET
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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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |