US4780151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid filter cleaning method
Assignee: Filtration Water Filters for Agriculture and Industry Ltd
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Filing: 1985-05-14
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Granted: 1988-10-25
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Expires: 2005-05-14
Abstract
Abstract There is provided a method for cleaning corrugated filter elements by means of suction nozzles. The method comprises a corrugated filter element and at least one suction nozzle movable relative to the surface of the element. The specific parameters of the method are interrelated in accordance with a specially developed given formula.
Inventors
- 👤 Ytzhak Barzuza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:30
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/01; B01D29/03; B01D29/031; B01D29/62; B01D29/66; B01D29/68; B01D29/684; B01D29/688
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A method for cleaning a corrugated filter element having apices using a suction nozzle, said method comprising the step of moving said nozzle over the surface of said element at a distance C above, and clearing, the apices of said element, wherein C has the following value: C≦[A(1.5-0.9F×G)-D×E]/B where: A is the inside cross-sectional area of the nozzle; B is the inside circumference of the nozzle; C is the spacing of nozzle mouth from the apices; D is the maximum width of the nozzle perpendicular to the orientation of the corrugations; E is the height of the corrugations; F is the density of the corrugations given by: ##EQU8## G is open fraction of filter element given by: ##EQU9##
Claim 2
Independent Claim
118 words
A method for cleaning a corrugated filter element having apices using a suction nozzle, said method comprising the step of moving said nozzle over the surface of said element at a distance C above, and clearing, the apices of said element, wherein C has the following value: C≦[A(1.5-0.9F×G)-D×E]/B where: A is the inside cross-sectional area of the nozzle; B is the inside circumference of the nozzle; C is the spacing of nozzle mouth from the apices; D is the maximum width of the nozzle perpendicular to the orientation of the corrugations; E is the height of the corrugations; F is the density of the corrugations given by: ##EQU8## G is open fraction of filter element given by: ##EQU9##
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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) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |