US3334748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable capacity filter devices
Assignee: Rosaen Filter Co
•
Filing: 1965-04-29
•
Granted: 1967-08-08
•
Expires: 1985-04-29
Abstract
No abstract record available.
Inventors
- 👤 John W Bozek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:33
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/213
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
A FILTER DEVICE COMPRISING (A) A SUBSTANTIALLY CYLINDRICAL HOUSING MEMBER DEFINING A FILTER CHAMBER AND HAVING AN INLET AND AN OUTLET OPEN TO SAID FILTER CHAMBER, (B) A HOLLOW CYLINDRICAL FILTER ELEMENT CARRIED IN SAID FILTER CHAMBER INTERMEDIATE SAID INLET AND SAID OUTLET, (C) PRESSURE RESPONSIVE MEANS CARRIED IN SAID HOUSING MEMBER AND MOVABLE AXIALLY THEREIN IN RESPONSE TO CHANGES IN THE PRESSURE DIFFERENTIAL ACROSS SAID FILTER ELEMENT,AND (D) MEANS ACTUATED BY SAID PRESSURE RESPONSIVE MEANS AND OPERABLE TO MOVE AXIALLY WITH SAID PRESSURE RESPONSIVE MEANS TO CLOSE FLUID FLOW THROUGH A PORTION OF THE AXIAL LENGTH OF SAID FILTER ELEMENT UPON THE PRESSURE DIFFERENTIAL ACROSS SAID ELEMENT DECREASING TO A PREDETERMINED VALUE.
References Cited (Backward Citations)
US1696313A
Cited
US2079365A
Cited
US2134061A
Cited
US2460084A
Cited
US2692686A
Cited
US3184064A
Cited
US3216572A
Cited
US3268077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-07 | 1971-02-06 | 1971-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-07 | 1975-02-06 | 1975-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-07 | 1979-02-06 | 1979-08-08 | $7700.00 | Window Closed / Lapsed |