US4886533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas filter
Assignee: Pureron Japan Co Ltd
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Filing: 1988-09-29
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Granted: 1989-12-12
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Expires: 2008-09-29
Abstract
Abstract A gas filter that has a simple structure and maintain the sealing effect of sealing members even at a high temperature is disclosed. The gas filter comprises a case with a gas inlet and a gas outlet, a ceramic filter placed in the case, sealing members for sealing gaps between the case and the filter and also for directing gas entering from the gas inlet so as not to bypass the filter before exiting, and an elastic member placed in the case for pressing the sealing members to ensure unfailing sealing.
Inventors
- 👤 Kimiaki Sakashita
- 👤 Masaaki Kouno
- 👤 Hideo Tsukazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:52
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0002; B01D46/0012; B01D46/24; B01D46/2403; B01D46/2407; B01D2265/00; B01D2265/02; B01D2265/024; B01D2265/025; B01D2271/00; B01D2271/02; B01D2271/022; B01D2273/00; B01D2273/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
A gas filter, comprising: a cylindrical casing having a first end with a gas inlet opening and a second end with a gas outlet opening; a cylindrical ceramic filter arranged concentrically in said casing so that a clearance exists between said filter and said casing; a first ring-shaped seal interposed between a first end of said ceramic filter and said casing; a bottom-form cylindrical spring receiver having an open end with an external circumference on which a flange is provided, said flange being arranged outside a second end of said ceramic filter, a bottom end of said spring receiver being arranged concentrically within said ceramic filter so that a clearance exists between said spring receiver and said ceramic filter; a second seal interposed between the second end of said ceramic filter and said flange of said spring receiver; and a spring arranged between the bottom of said spring receiver and said casing so as to urge said first seal and second seal in a direction of compression.
Claim 2
Dependent Claim
167 words
A gas filter, comprising: a cylindrical casing having a first end with a gas inlet opening and a second end with a gas outlet opening; a cylindrical ceramic filter arranged concentrically in said casing so that a clearance exists between said filter and said casing; a first ring-shaped seal interposed between a first end of said ceramic filter and said casing; a bottom-form cylindrical spring receiver having an open end with an external circumference on which a flange is provided, said flange being arranged outside a second end of said ceramic filter, a bottom end of said spring receiver being arranged concentrically within said ceramic filter so that a clearance exists between said spring receiver and said ceramic filter; a second seal interposed between the second end of said ceramic filter and said flange of said spring receiver; and a spring arranged between the bottom of said spring receiver and said casing so as to urge said first seal and second seal in a direction of compression.
Claim 3
Dependent Claim
29 words
A gas filter as defined in claim 1, wherein said casing is formed of two cylindrical casings welded together in the proximity of the longitudinal center of the casing.
Claim 4
Dependent Claim
17 words
A gas filter as defined in claim 1, wherein said ceramic filter is a porous ceramic body.
Claim 5
Dependent Claim
21 words
A gas filter as defined in claim 1, wherein said first seal and said second seal are made of fluorine resin.
References Cited (Backward Citations)
FR1216783A
Cited
US3170872A
Cited
US3300050A
Cited
US3386230A
Cited
US4372847A
Cited
US4791785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |