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US4257894A Expired / Lapsed US ⏱️ 0.0 years remaining

Filter core extender and seal

Assignee: Veolia WTS Solutions USA Inc
•
Filing: 1978-11-02
•
Granted: 1981-03-24
•
Expires: 1998-11-02
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Abstract

Abstract A core extender and seal are provided which may be used in combination with cartridge filters. The core extender includes a body having first and second ends which are connected by longitudinal communication means through the core extender body. A radially extending shoulder extends from the body and is axially spaced from at least one end of the body, and preferably is a flange having on at least one lateral surface thereof an annular sealing ring. An external surface extends from at least one end to the radially extending shoulder. The portion of the body defined by an external surface may be inserted into the longitudinal bore of the filter cartridge in order to perform a sealing and connecting function between adjacent filters or a cartridge filter and the filter housing. Adjacent cartridge filters may be connected and adjacent radial surfaces sealed from filtrate leakage by placing an annular sealing ring therebetween such that the peripheral edge of the ring is pressed into the end surface of each cartridge filter. The annular sealing ring has an inside diameter which is greater than the diameter of the bore of the cartridge filter while the outside diameter of the annular ring is less than the diameter of the cartridge filter. The annular sealing ring has a peripheral edge which is capable of being pressed into an end surface of a cartridge filter in order to seal adjacent radial surfaces of two cartridge filters.

Inventors

  • 👤 Marshall Barney

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 00:35
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/50; B01D29/52; B01D29/54; B01D2201/00; B01D2201/40

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 179 words
In combination with a cartridge filter having a longitudinal bore, a cartridge filter core extender for insertion into the bore, the core extender comprising a core extender body having first and second ends with communication means extending longitudinally through said body between the first and second ends, a shoulder extending generally radially from the body and axially spaced from each end, a first external surface extending between the first end and the shoulder, a second external surface extending between the second end and the shoulder, the diameter of said radially extending shoulder being greater than the diameter of the longitudinal bore of the cartridge filter, said first external surface defining a portion of said core extender which is inserted into the longitudinal bore of the cartridge filter and is of such a dimension so as to prevent the passage of fluid between the external surface of the extender and the body of the filter, the radially extending shoulder being pressed against an end surface of said cartridge filter and said core extender being spin welded to said cartridge filter.
Claim 2
Dependent Claim 179 words
In combination with a cartridge filter having a longitudinal bore, a cartridge filter core extender for insertion into the bore, the core extender comprising a core extender body having first and second ends with communication means extending longitudinally through said body between the first and second ends, a shoulder extending generally radially from the body and axially spaced from each end, a first external surface extending between the first end and the shoulder, a second external surface extending between the second end and the shoulder, the diameter of said radially extending shoulder being greater than the diameter of the longitudinal bore of the cartridge filter, said first external surface defining a portion of said core extender which is inserted into the longitudinal bore of the cartridge filter and is of such a dimension so as to prevent the passage of fluid between the external surface of the extender and the body of the filter, the radially extending shoulder being pressed against an end surface of said cartridge filter and said core extender being spin welded to said cartridge filter.
Claim 3
Dependent Claim 17 words
The combination of claim 1 wherein the radially extending shoulder of the core extender is a flange.
Claim 4
Dependent Claim 12 words
The combination of claim 2 wherein the first external surface is cylindrical.
Claim 5
Dependent Claim 29 words
The combination of claim 2 wherein at least one lateral surface of the flange is provided with an annular sealing ring which extends from the at least one surface.
Claim 6
Dependent Claim 14 words
The combination of claim 4 wherein the cartridge filter has a uniform density gradient.
Claim 7
Dependent Claim 16 words
The combination of claim 4 wherein the first external surface of the core extender is cylindrical.
Claim 8
Dependent Claim 16 words
The combination of claim 6 wherein the second external surface of the core extender is cylindrical.
Claim 9
Dependent Claim 16 words
The combination of claim 6 wherein the second external surface of the core extender is frustoconical.

References Cited (Backward Citations)

US205709A Cited
US2525287A Cited
US3092577A Cited
US3002870A Cited
US3547719A Cited
US3633757A Cited
US3870636A Cited
US3980248A Cited
US3868325A Cited
US3934906A Cited
US3992045A Cited
US4062781A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-03-23 1984-09-22 1985-03-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-03-23 1988-09-22 1989-03-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-03-23 1992-09-22 1993-03-24 $7700.00 Window Closed / Lapsed

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