US3880625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter system
Assignee: Moore and Hanks Co
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Filing: 1973-09-28
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Granted: 1975-04-29
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Expires: 1993-09-28
Abstract
Abstract Bypass around a filter in a conduit is prevented by providing first and second closures between the conduit and the high pressure and low pressure sides, respectively, of the filter, and creating a pressure in the conduit between the two closures that is lower than the pressure on the low pressure side of the filter.
Inventors
- 👤 Hugh Thomas Shook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:13
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; Y; Y10; Y10S; Y10S55/00; Y10S55/29
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
FILTERING APARATUS COMPRISING: A. A CONDUIT FOR A FLUID TO BE FILTERED: B. MEANS FOR SUPPLYING THE FLUID TO THE CONDUIT: C. A FILTER DISPOSED IN THE CONDUIT THROUGH WHICH FLUID PASSES FROM AN UPSTREAM SIDE TO A DOWNSTREAM SIDE AND IS FILTERED, D. IMPERFORATE FIRST MEANS FORMING A FIRST CLOSURE BETWEEN THE CONDUIT AND AROUND THE PERIPHERY OF THE SIDE OF THE FILTER, E. IMPERFORATE SECOND MEANS FORMING A SECOND CLOSURE BETWEEN THE CONDUIT AND AROUND THE PERIPHERY OF THE FILTER DOWNSTREAM OF THE FIRST MEANS OF DEFINE A CHANNEL AROUND THE FILTER PERIPHERY AND IN DIRECT COMMUNICATION WITH SUBSTANTIALLY ALL OF THE FILTER PERIPHERY BETWEEN THE FIRST AND SECOND CLOSURE MEANS, AND F. MEANS FOR CREATING A PRESSURE IN THE CHANNEL BETWEEN THE TWO CLOSURES LOWER THAN THE PRESSURE OF THE FLUID IN THE CONDUIT ON THE DOWNSTREAM SIDE OF THE FILTER TO PREVENT FLUID FROM BYPASSING THE FILTER.
Claim 2
Dependent Claim
151 words
FILTERING APARATUS COMPRISING: A. A CONDUIT FOR A FLUID TO BE FILTERED: B. MEANS FOR SUPPLYING THE FLUID TO THE CONDUIT: C. A FILTER DISPOSED IN THE CONDUIT THROUGH WHICH FLUID PASSES FROM AN UPSTREAM SIDE TO A DOWNSTREAM SIDE AND IS FILTERED, D. IMPERFORATE FIRST MEANS FORMING A FIRST CLOSURE BETWEEN THE CONDUIT AND AROUND THE PERIPHERY OF THE SIDE OF THE FILTER, E. IMPERFORATE SECOND MEANS FORMING A SECOND CLOSURE BETWEEN THE CONDUIT AND AROUND THE PERIPHERY OF THE FILTER DOWNSTREAM OF THE FIRST MEANS OF DEFINE A CHANNEL AROUND THE FILTER PERIPHERY AND IN DIRECT COMMUNICATION WITH SUBSTANTIALLY ALL OF THE FILTER PERIPHERY BETWEEN THE FIRST AND SECOND CLOSURE MEANS, AND F. MEANS FOR CREATING A PRESSURE IN THE CHANNEL BETWEEN THE TWO CLOSURES LOWER THAN THE PRESSURE OF THE FLUID IN THE CONDUIT ON THE DOWNSTREAM SIDE OF THE FILTER TO PREVENT FLUID FROM BYPASSING THE FILTER.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |