Patent US3856683A successfully refreshed from Google Patents.
US3856683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual flow fluid filter
Assignee: Individual
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Filing: 1972-12-15
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Granted: 1974-12-24
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Expires: 1992-12-15
Abstract
Abstract A Dual Flow Fluid Filter is provided which comprises a casing open at opposite end and having disposed within the casing a pair of identical filters arranged back-to-back and with a peripheral dam disposed between which forces the flow of fluid being filtered from outside a first filter to inside that filter, then to the inside of the next or second filter and to the outside thereof prior to leaving the casing, whereby a dual filtration of the fluid is obtained.
Inventors
- 👤 E Parr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:08
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/02; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/23; B01D29/50; B01D29/56; B01D29/58
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
282 words
A dual filter comprising: a cylindral casing having a first portion with an inlet therein and a secoNd portion with an outlet therein, said inlet and outlet being coaxially aligned; first cylindrical filter means disposed in said first portion of the casing, said first filter means having a first perforate peripheral surface spaced from the interior of the casing, a first imperforate annular flange extended radially outwardly from one end of the first filter means and abutting a peripheral edge of said first portion of the casing; second cylindrical filter means disposed in said second portion of the casing, said second filter means having a second perforate peripheral surface spaced from the interior of the casing, a second imperforate annular flange extending radially outwardly from one end of the second filter means and abutting the first annular flange of the first filter means and abutting a peripheral edge of said second portion of the casing; clamping means on said casing for clamping the abutting first and second annular flanges between the peripheral edges of said first and second portions of the casing and thereby forming a seal thereat; and supporting means for supporting said perforate surfaces of the first and second filter means, said supporting means comprising a plurality of parallel ribs extending from the first and second annular flanges, along the first and second perforate surfaces, to the other respective ends of said first and second filter means, said other ends of said first and second filter means being imperforate, and each other end having a tapering projection thereon which is coaxially aligned with the coaxially aligned inlet and outlet to thereby disperse the flow of fluid evenly through the filter.
Claim 2
Dependent Claim
282 words
A dual filter comprising: a cylindral casing having a first portion with an inlet therein and a secoNd portion with an outlet therein, said inlet and outlet being coaxially aligned; first cylindrical filter means disposed in said first portion of the casing, said first filter means having a first perforate peripheral surface spaced from the interior of the casing, a first imperforate annular flange extended radially outwardly from one end of the first filter means and abutting a peripheral edge of said first portion of the casing; second cylindrical filter means disposed in said second portion of the casing, said second filter means having a second perforate peripheral surface spaced from the interior of the casing, a second imperforate annular flange extending radially outwardly from one end of the second filter means and abutting the first annular flange of the first filter means and abutting a peripheral edge of said second portion of the casing; clamping means on said casing for clamping the abutting first and second annular flanges between the peripheral edges of said first and second portions of the casing and thereby forming a seal thereat; and supporting means for supporting said perforate surfaces of the first and second filter means, said supporting means comprising a plurality of parallel ribs extending from the first and second annular flanges, along the first and second perforate surfaces, to the other respective ends of said first and second filter means, said other ends of said first and second filter means being imperforate, and each other end having a tapering projection thereon which is coaxially aligned with the coaxially aligned inlet and outlet to thereby disperse the flow of fluid evenly through the filter.
Claim 3
Dependent Claim
20 words
A dual filter as defined in claim 1 wherein said first filter means and said second filter means are identical.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |