US4906357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter system having multiple filter elements and back flushing assemblies
Assignee: Individual
•
Filing: 1988-07-25
•
Granted: 1990-03-06
•
Expires: 2008-07-25
Abstract
Abstract A backflushable filter including a housing having an inlet coupled to an upstream fluid inlet and an outlet coupled to a downstream fluid outlet, a filter assembly including a plurality of cylindrical filters, defining an upstream surface communication with the inlet and a downstream surface communication with an axial hollow volume therein, the axial hollow volume communicating with the outlet, a backflushing assembly comprising a backflushing nozzle disposed in each axial hollow volume for backflushing engagement with each of the cylindrical filters at its downstream surface, and a backflush drain communicating with the upstream surface.
Inventors
- 👤 Mordeki Drori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:04
CPC Classifications
B; B08; B08B; B08B9/00; B08B9/08; B08B9/093; B01; B01D; B01D29/00; B01D29/11; B01D29/114; B01D29/50; B01D29/52; B01D29/62; B01D29/66; B01D29/68; B01D29/684; B01D2201/00; B01D2201/04; B01D2201/0469; B01D2201/0476
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
179 words
A backflushable filter system comprising: a housing having a housing inlet coupled to an upstream fluid inlet and a housing outlet coupled to a downstream fluid outlet; a filter assembly including a plurality of cylindrical filters, each individual one of said plurality of cylindrical filters defining an upstream surface communicating with said housing inlet and a downstream surface communicating with an axial hollow volume within said individual one of said plurality of cylindrical filters, said axial hollow volume communicating with said housing outlet; a backflushing assembly comprising a plurality of backflushing nozzles, one of said plurality of backflushing nozzles being disposed in each said axial hollow volume for backflushing engagement with the corresponding one of said plurality of cylindrical filters at its downstream surface; a backflush drain communicating with said upstream surface; and means for selectably raising and lowering each of said plurality of backflushing nozzles axially through said axial hollow volume of each individual one of said plurality of cylindrical filters for systematic backflushing of substantially the entirety of each individual one of said plurality of cylindrical filters.
Claim 2
Dependent Claim
179 words
A backflushable filter system comprising: a housing having a housing inlet coupled to an upstream fluid inlet and a housing outlet coupled to a downstream fluid outlet; a filter assembly including a plurality of cylindrical filters, each individual one of said plurality of cylindrical filters defining an upstream surface communicating with said housing inlet and a downstream surface communicating with an axial hollow volume within said individual one of said plurality of cylindrical filters, said axial hollow volume communicating with said housing outlet; a backflushing assembly comprising a plurality of backflushing nozzles, one of said plurality of backflushing nozzles being disposed in each said axial hollow volume for backflushing engagement with the corresponding one of said plurality of cylindrical filters at its downstream surface; a backflush drain communicating with said upstream surface; and means for selectably raising and lowering each of said plurality of backflushing nozzles axially through said axial hollow volume of each individual one of said plurality of cylindrical filters for systematic backflushing of substantially the entirety of each individual one of said plurality of cylindrical filters.
Claim 3
Dependent Claim
23 words
A backflushable filter system according to claim 1 and wherein each of said plurality of backflushing nozzles comprises a fluid-driven rotating backflushing nozzle.
Claim 4
Dependent Claim
31 words
A backflushable filter system according to claim 1 and also comprising a backflush selection valve for selectably coupling either said upstream fluid inlet or said backflush drain with said housing inlet.
Claim 5
Dependent Claim
30 words
A backflushable filter system according to claim 1 and wherein said backflushing assembly also comprises a manifold for physically joining, supporting and supplying fluid to said plurality of backflushing nozzles.
Claim 6
Dependent Claim
27 words
A backflushable filter system according to claim 1 and wherein said backflushing assembly also comprises a manifold for physically joining and supporting said plurality of backflushing nozzles.
Claim 7
Dependent Claim
29 words
A backflushable filter system according to claim 1 and wherein said backflushing assembly also comprises a manifold for physically joining and supplying fluid to said plurality of backflushing nozzles.
Claim 8
Dependent Claim
23 words
A backflushable filter system according to claim 1 and wherein said housing is formed with a body portion and a top closing portion.
Claim 9
Dependent Claim
28 words
A backflushable filter system according to claim 1 and wherein each of said plurality of cylindrical filters comprises a disk filter formed of a stack of filter disks.
Claim 10
Dependent Claim
34 words
A backflushable filter system according to claim 1 and wherein said means for selectably raising and lowering comprise means for permitting selectable raising and lowering of the entire said plurality of backflushing nozzles simultaneously.
Claim 11
Dependent Claim
34 words
A backflushable filter system according to claim 1 and wherein said means for selectably raising and lowering comprise means for permitting selectable raising and lowering of individual ones of said plurality of backflushing nozzles.
Claim 12
Dependent Claim
22 words
A backflushable filter system according to claim 1 and wherein said means for selectably raising and lowering comprises a fluid operated piston.
Claim 13
Dependent Claim
19 words
A backflushable filter system according to claim 11 and wherein said fluid operated piston is located within said housing.
Claim 14
Dependent Claim
26 words
A backflushable filter system according to claim 11 and wherein said fluid operated piston is operative to position and support said backflushing assembly during filtering operation.
Claim 15
Dependent Claim
43 words
A backflushable filter system according to claim 1 and also comprising means for automatically controlling operation of said means for selectably raising and lowering and for coordinating therewith the supply of backflushing fluid to said individual ones of said plurality of backflushing nozzles.
Claim 16
Dependent Claim
49 words
A backflushable filter system according to claim 14 and also comprising a backflush selection valve for selectably coupling either said upstream fluid inlet or said backflush drain with said housing inlet, wherein said means for automatically controlling is also operative to control the operation of said backflush selection valve.
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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) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |