Patent US4690761A successfully refreshed from Google Patents.
US4690761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annular filter disc
Assignee: AMIAD SINUN VEHASHKAYA A REGISTERED PARTNERSHIP
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Filing: 1986-02-10
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Granted: 1987-09-01
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Expires: 2006-02-10
Abstract
Abstract An improved annular filter disc for use in a tubular filter stack of the kind, wherein filtration takes place by causing the liquid to be filtered to pass through the filter stack, wherein the disc is formed with a plurality of angularly spaced apart, springy spacer projections.
Inventors
- 👤 Itzhak Orlans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:09
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/44; B01D29/46
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
A tubular filter stack comprising a stack of annular filter discs; a plurality of angularly spaced apart springy spacer projections formed integrally with a first surface of each disc so as to abut a second and opposite surface of a successive disc for enabling compression of said discs into close juxtaposition one with the other during a filtering cycle and for enabling expansion of said disc one from the other sufficient to enable flushing during a flushing mode; disc mounting means for mounting said discs in a stacked condition and releasable clamping means for clamping said discs together so as to compress said projections.
Claim 2
Dependent Claim
104 words
A tubular filter stack comprising a stack of annular filter discs; a plurality of angularly spaced apart springy spacer projections formed integrally with a first surface of each disc so as to abut a second and opposite surface of a successive disc for enabling compression of said discs into close juxtaposition one with the other during a filtering cycle and for enabling expansion of said disc one from the other sufficient to enable flushing during a flushing mode; disc mounting means for mounting said discs in a stacked condition and releasable clamping means for clamping said discs together so as to compress said projections.
Claim 3
Dependent Claim
35 words
A tubular filter stack according to claim 1 wherein said projections are formed in an outer annular portion of the disc and wherein filter grooves are formed in an inner annular portion of each disc.
Claim 4
Dependent Claim
21 words
A tubular filter stack according to claim 2 wherein angularly spaced apart apertures are formed in each said outer annular portion.
Claim 5
Dependent Claim
26 words
A tubular filter stack according to claim 1 wherein each projection comprises a raised strip which is formed integrally at its end portions with each disc.
References Cited (Backward Citations)
AT238729B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |