US5028327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter element
Assignee: 3M Purification Inc
•
Filing: 1989-09-13
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Granted: 1991-07-02
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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 cylindrical 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 edges 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 18:01
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: 8
Claim 1
Independent Claim
124 words
A filter element comprising: a tubular filter structure having at least one end adapted to coact with a housing for the filter; annular gasket means for sealing the end of the filter with a coacting housing for the filter; the gasket means comprising: a preformed sheet of resilient thermoplastic closed cell foam; the surface of the gasket sheet remote from said filtering structure, being adapted to resiliently coact with a filter housing; the surface of the gasket sheet abutting said filtering structure having a melt surface, the melt surface being integral with and formed from the gasket sheeting; and adhering means to adhere the gasket to the end of the filter consisting of the surface of the melted closed cell material of the gasket.
Claim 2
Dependent Claim
124 words
A filter element comprising: a tubular filter structure having at least one end adapted to coact with a housing for the filter; annular gasket means for sealing the end of the filter with a coacting housing for the filter; the gasket means comprising: a preformed sheet of resilient thermoplastic closed cell foam; the surface of the gasket sheet remote from said filtering structure, being adapted to resiliently coact with a filter housing; the surface of the gasket sheet abutting said filtering structure having a melt surface, the melt surface being integral with and formed from the gasket sheeting; and adhering means to adhere the gasket to the end of the filter consisting of the surface of the melted closed cell material of the gasket.
Claim 3
Dependent Claim
12 words
The filter element of claim 1, wherein the polymer is a polyolefin.
Claim 4
Dependent Claim
12 words
The filter element of claim 1, wherein the polymer is a polyethylene.
Claim 5
Dependent Claim
14 words
The filter element of claim 1, wherein the polymer is a radiation cross-linked polyethylene.
Claim 6
Dependent Claim
45 words
The combination filter element and housing therefor comprising: the filter element of claim 1, 2, 3 or 4, and a filter housing having a sealing edge for engaging the surface of the gasket sheet remote from the filtering structure to sealingly and resiliently coact therewith.
Claim 7
Dependent Claim
26 words
The combination of claim 5, wherein the sealing edge comprises at least one circular removable sealing edge concentric to the axis of the tubular filter structure.
Claim 8
Dependent Claim
60 words
The combination of claim 6, wherein there are at least two concentric circular removable sealing edges to provide an indicia area on the gasket between the concentric sealing edges which discolors upon exposure to the filtration fluid to indicate bypass of the fluid around the sealing edges and when said sealing edges are removed the indicia area may be observed.
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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) | 1994-07-01 | 1994-12-31 | 1995-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-01 | 1998-12-31 | 1999-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-01 | 2002-12-31 | 2003-07-02 | $7700.00 | Window Closed / Lapsed |