Patent US3280981A successfully refreshed from Google Patents.
US3280981A
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Assignee: Individual
•
Filing: 1964-02-10
•
Granted: 1966-10-25
•
Expires: 1984-02-10
Abstract
No abstract record available.
Inventors
- 👤 Paul B Renfrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:51
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/117; B01D29/118; B01D29/88; B01D29/90; B01D29/902; B01D29/94
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A FILTER ASSEMBLY COMPRISING A HOUSING, A FILTER ELEMENT, MEANS SUPPORTING SAID FILTER ELEMENT IN SAID HOUSING, MEANS FORMING WITH SAID FILTER ELEMENT, A FLOW PATH ALONG ONE SIDE OF SAID FILTER ELEMENT, MEANS FOR CONTINUOUSLY INTRODUCING A LIQUID AND SOLIDS MIXTURE TO BE FILTERED, INTO SAID HOUSING FOR ACCESS TO ONE END OF SAID FLOW PATH FOR MOVEMENT OVER THE SURFACE OF SAID FILTER ELEMENT, WHEREBY A PORTION OF SAID LIQUID WILL FILTER THROUGH SAID FILTER ELEMENT WHILE THE REMAINDER OF SAID LIQUID AND SOLIDS WILL EMERGE FROM THE OTHER END OF SAID FLOW PATH, MEANS FOR WITHDRAWING FROM SAID HOUSING, THE PORTION OF THE LIQUID FILTERING THROUGH SAID FILTER ELEMENT, MEANS ADJACENT SAID OTHER END OF SAID FLOWA PATH FOR CONTINUOUSLY REMOVING SUBSTANTIALLY ALL THE SOLIDS FROM THE REMAINDER OF SAID LIQUID, AND MEANS FOR RECIRCULATING THE REMAINDER OF SAID LIQUID TO THE SAID ONE END OF SAID FLOW PATH FOR MIXING WITH LIQUID AND SOLIDS MIXTURE BEING INTRODUCED.
Claim 2
Dependent Claim
161 words
A FILTER ASSEMBLY COMPRISING A HOUSING, A FILTER ELEMENT, MEANS SUPPORTING SAID FILTER ELEMENT IN SAID HOUSING, MEANS FORMING WITH SAID FILTER ELEMENT, A FLOW PATH ALONG ONE SIDE OF SAID FILTER ELEMENT, MEANS FOR CONTINUOUSLY INTRODUCING A LIQUID AND SOLIDS MIXTURE TO BE FILTERED, INTO SAID HOUSING FOR ACCESS TO ONE END OF SAID FLOW PATH FOR MOVEMENT OVER THE SURFACE OF SAID FILTER ELEMENT, WHEREBY A PORTION OF SAID LIQUID WILL FILTER THROUGH SAID FILTER ELEMENT WHILE THE REMAINDER OF SAID LIQUID AND SOLIDS WILL EMERGE FROM THE OTHER END OF SAID FLOW PATH, MEANS FOR WITHDRAWING FROM SAID HOUSING, THE PORTION OF THE LIQUID FILTERING THROUGH SAID FILTER ELEMENT, MEANS ADJACENT SAID OTHER END OF SAID FLOWA PATH FOR CONTINUOUSLY REMOVING SUBSTANTIALLY ALL THE SOLIDS FROM THE REMAINDER OF SAID LIQUID, AND MEANS FOR RECIRCULATING THE REMAINDER OF SAID LIQUID TO THE SAID ONE END OF SAID FLOW PATH FOR MIXING WITH LIQUID AND SOLIDS MIXTURE BEING INTRODUCED.
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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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |