Patent US2646114A successfully refreshed from Google Patents.
Patent US3310175A successfully refreshed from Google Patents.
US3310175A
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Assignee: McGraw Edison Co
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Filing: 1966-04-22
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Granted: 1967-03-21
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Expires: 1986-04-22
Abstract
No abstract record available.
Inventors
- 👤 Russell G Mclagan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:22
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/02; B01D29/00; B01D29/11; B01D29/114; B01D29/50; B01D29/52; B01D29/62; B01D29/64; B01D29/6469; B01D29/6484; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0446; B01D2201/0461
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
IN AN UPFLOW FILTERING SYSTEM, THE COMBINATION OF A HOLLOW CASING HAVING AN INLET ADJACENT ITS LOWER END AND AN OUTLET ADJACENT ITS UPPER END AND MEANS FOR INTRODUCING FLUID AND FILTER AID MEDIUM INTO SAID INLET AND FOR REMOVING FLUID FROM SAID OUTLET, FIXED PARTITION MEANS DIVIDING SAID CASING INTO UPPER AND LOWER CHAMBERS, A PLURALITY OF APERTURES FORMED IN SAID PARTITION MEANS, A PLURALITY OF PERVIOUS ELONGATE TUBULAR FILTER ELEMENTS, EACH OF SAID ELEMENTS BEING ATTACHED AT ONE END TO SAID PARTITION MEANS IN SURROUNDING RELATION TO ONE OF SAID APERTURES AND EXTENDING INTO SAID LOWER CHAMBER, SAID FILTER AID MEDIUM BEING DEPOSITED ON EACH OF SAID ELEMENTS, A COIL SPRING DISPOSED IN CONCENTRIC SURROUNDING RELATION TO EACH OF SAID FILTER ELEMENTS AND DISPOSED BENEATH SAID FILTER AID MEDIUM, SAID SPRINGS HAVING WIDELY SPACED CONVOLUTIONS, COUPLING MEANS CONNECTED TO ONE END OF EACH OF SAID SPRINGS, AND SELECTIVELY OPERABLE DRIVE MEANS ENGAGING SAID COUPLING MEANS FOR SIMULTANEOUSLY MOVING SAID SPRINGS LONGITUDINALLY OF THEIR RESPECTIVE FILTER ELEMENTS.
Claim 2
Dependent Claim
168 words
IN AN UPFLOW FILTERING SYSTEM, THE COMBINATION OF A HOLLOW CASING HAVING AN INLET ADJACENT ITS LOWER END AND AN OUTLET ADJACENT ITS UPPER END AND MEANS FOR INTRODUCING FLUID AND FILTER AID MEDIUM INTO SAID INLET AND FOR REMOVING FLUID FROM SAID OUTLET, FIXED PARTITION MEANS DIVIDING SAID CASING INTO UPPER AND LOWER CHAMBERS, A PLURALITY OF APERTURES FORMED IN SAID PARTITION MEANS, A PLURALITY OF PERVIOUS ELONGATE TUBULAR FILTER ELEMENTS, EACH OF SAID ELEMENTS BEING ATTACHED AT ONE END TO SAID PARTITION MEANS IN SURROUNDING RELATION TO ONE OF SAID APERTURES AND EXTENDING INTO SAID LOWER CHAMBER, SAID FILTER AID MEDIUM BEING DEPOSITED ON EACH OF SAID ELEMENTS, A COIL SPRING DISPOSED IN CONCENTRIC SURROUNDING RELATION TO EACH OF SAID FILTER ELEMENTS AND DISPOSED BENEATH SAID FILTER AID MEDIUM, SAID SPRINGS HAVING WIDELY SPACED CONVOLUTIONS, COUPLING MEANS CONNECTED TO ONE END OF EACH OF SAID SPRINGS, AND SELECTIVELY OPERABLE DRIVE MEANS ENGAGING SAID COUPLING MEANS FOR SIMULTANEOUSLY MOVING SAID SPRINGS LONGITUDINALLY OF THEIR RESPECTIVE FILTER ELEMENTS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |