US5015316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter element
Assignee: 3M Purification Inc
•
Filing: 1989-09-13
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Granted: 1991-05-14
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Expires: 2009-09-13
Abstract
Abstract A filter element adapted to be sealingly clamped in a filter housing. The element comprises a porous hollow cylindrical integral self-supporting bonded fibrous structure. The structure has thermally melt bonded to at least one end thereof, a thermoplastic polymer closed cell foam sealing gasket. The gasket is adapted to provide a sealing surface between the end of the cartridge and the sealing edge of the filter housing. In a preferred embodiment, the sealing edges of the filter housing used in conjunction with the aforedescribed filter element comprises at least two circular sealing edges concentric to the axis of the cylinder filter element. Such a combination provides a means for determining whether there is leakage past the sealing edges by the discoloration of the sealing gasket area between the concentric sealing edge by the liquid being filtered.
Inventors
- 👤 Eugene A. Ostreicher
- 👤 Joseph R. Infantino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:38
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/31; B01D29/33; B01D29/50; B01D29/52; B01D2101/00; B01D2101/005; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0453; B01D2201/18; B01D2201/182; B01D2201/188; B01D2201/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
A method of manufacturing filter elements, comprising: forming a filtering structure having at least one end adapted to coact with a filter housing; forming a gasket means from a preformed resilient thermoplastic polymer closed cell foam sheet, said gasket means for sealing the end of the filtering structure and coacting with the housing for the filter; heating the end of the filtering structure to a sufficiently high temperature adequate to form a melt surface on only one surface of the gasket sheet when the gasket is contacted to the heated end of the filtering structure; and subsequently, contacting the heated end of the filtering structure to one surface of the gasket, whereby the melt surface is formed from and integral with the gasket sheet on said surface and adheres the gasket to the end of the filter structure, the gasket's other surface remaining sufficiently resilient to coact with the filter housing for sealing the end of the filter.
Claim 2
Independent Claim
158 words
A method of manufacturing filter elements, comprising: forming a filtering structure having at least one end adapted to coact with a filter housing; forming a gasket means from a preformed resilient thermoplastic polymer closed cell foam sheet, said gasket means for sealing the end of the filtering structure and coacting with the housing for the filter; heating the end of the filtering structure to a sufficiently high temperature adequate to form a melt surface on only one surface of the gasket sheet when the gasket is contacted to the heated end of the filtering structure; and subsequently, contacting the heated end of the filtering structure to one surface of the gasket, whereby the melt surface is formed from and integral with the gasket sheet on said surface and adheres the gasket to the end of the filter structure, the gasket's other surface remaining sufficiently resilient to coact with the filter housing for sealing the end of the filter.
Claim 3
Dependent Claim
39 words
The method of manufacture of claim 1, wherein the step of forming a gasket from a resilient thermoplastic polymer closed cell foam comprises the step of cutting the gasket from a sheet of resilient thermoplastic polymer closed cell foam.
Claim 4
Dependent Claim
27 words
The method of manufacture of claim 1, wherein the sufficiently high temperature is below the temperature at which the filtering structure starts to deteriorate, melt and/or fuse.
Claim 5
Dependent Claim
11 words
The filter element of claim 1, wherein the polymer is polyolefin.
Claim 6
Dependent Claim
11 words
The filter element of claim 1, wherein the polymer is polyethylene.
Claim 7
Dependent Claim
13 words
The filter element of claim 1, wherein the polymer is radiation cross-linked polyethylene.
References Cited (Backward Citations)
US2539768A
Cited
GB689595A
Cited
US2642187A
Cited
US2726184A
Cited
US2771156A
Cited
US2739916A
Cited
US3002870A
Cited
US3164506A
Cited
US3397518A
Cited
US3720323A
Cited
US3884662A
Cited
GB1334002A
Cited
FR2266535A1
Cited
US4038194A
Cited
DE2429474A1
Cited
DE2620148A1
Cited
US3989491A
Cited
US4159197A
Cited
GB2048109A
Cited
JPS55159822A
Cited
JPS5610084A
Cited
US4464263A
Cited
US4391384A
Cited
DE3208438A1
Cited
JPS5985472A
Cited
GB2134811A
Cited
GB2140317A
Cited
US4725323A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-13 | 1994-11-12 | 1995-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-13 | 1998-11-12 | 1999-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-13 | 2002-11-12 | 2003-05-14 | $7700.00 | Window Closed / Lapsed |