Patent US4372853A successfully refreshed from Google Patents.
US4372853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable, hermetically-sealing, filter attachment system for hostile environments
Assignee: United States Department of Energy
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Filing: 1981-06-03
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Granted: 1983-02-08
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Expires: 2001-06-03
Abstract
Abstract A removable and reusable filter attachment system. A filter medium is fixedo, and surrounded by, a filter frame having a coaxial, longitudinally extending, annular rim. The rim engages an annular groove which surrounds the opening of a filter housing. The annular groove contains a fusible material and a heating mechanism for melting the fusible material. Upon resolidifying, the fusible material forms a hermetic bond with the rim and groove. Remelting allows detachment and replacement of the filter frame.
Inventors
- 👤 Glenn L. Mayfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:06
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/02; B; B01; B01D; B01D35/00; B01D35/30; B01D35/31; B01D46/00; B01D46/10; Y; Y10; Y10S; Y10S55/00; Y10S55/09
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
177 words
A removable filter attachment system, comprising: (a) a filter medium having an end; (b) an annular filter frame fixed to, and surrounding said filter medium, said filter frame having a first longitudinal axis and having a coaxially disposed, annular, first member surrounding said end; (c) a reusable filter housing having an opening generally matching said end of said filter medium, having a second longitudinal axis, and having a coaxially disposed, annular, second member surrounding said opening, said first and second members together consisting of a rim and a matching, engageable groove; (d) an environmentally resistant fusible material disposed in said groove, said fusible material having a melting point lower than that of said rim and lower than that of said groove, and said fusible material hermetically bondable, upon melting and resolidifying, with said rim and with said groove; and (e) attached means operably associated with said rim and groove for electrically resistive heating said fusible material to its melting point without reaching the melting point of said rim and without reaching the melting point of said groove.
Claim 2
Dependent Claim
177 words
A removable filter attachment system, comprising: (a) a filter medium having an end; (b) an annular filter frame fixed to, and surrounding said filter medium, said filter frame having a first longitudinal axis and having a coaxially disposed, annular, first member surrounding said end; (c) a reusable filter housing having an opening generally matching said end of said filter medium, having a second longitudinal axis, and having a coaxially disposed, annular, second member surrounding said opening, said first and second members together consisting of a rim and a matching, engageable groove; (d) an environmentally resistant fusible material disposed in said groove, said fusible material having a melting point lower than that of said rim and lower than that of said groove, and said fusible material hermetically bondable, upon melting and resolidifying, with said rim and with said groove; and (e) attached means operably associated with said rim and groove for electrically resistive heating said fusible material to its melting point without reaching the melting point of said rim and without reaching the melting point of said groove.
Claim 3
Dependent Claim
21 words
The system of claim 1, wherein said first member consists of said rim and said second member consists of said groove.
Claim 4
Dependent Claim
17 words
The system of claim 2, wherein said rim extends longitudinally beyond said end of said filter medium.
Claim 5
Dependent Claim
18 words
The system of claim 3, wherein said heating means is disposed in said groove of said filter housing.
Claim 6
Dependent Claim
23 words
The system of claim 4, wherein said filter housing is disposed to have said groove lie in a generally horizontal plane facing upwards.
Claim 7
Dependent Claim
12 words
The system of claim 5, wherein said fusible material includes a metal.
Claim 8
Dependent Claim
13 words
The system of claim 6, wherein said fusible material consists of Lipowitz' alloy.
Claim 9
Dependent Claim
18 words
The system of claim 3, wherein said heating means is attached to said rim of said filter frame.
Claim 10
Dependent Claim
19 words
The system of claim 8, wherein said material, when melted, has a viscous consistency and adheres to said groove.
Claim 11
Dependent Claim
21 words
The system of claim 9, wherein said filter housing is disposed to have said groove lie in a generally vertical plane.
Claim 12
Dependent Claim
23 words
The system of claim 9, wherein said filter housing is disposed to have said groove lie in a generally horizontal plane facing downwards.
Claim 13
Independent Claim
14 words
The system of claims 10 or 11, wherein said material includes ethyl cellulose plastic.
Claim 14
Dependent Claim
21 words
The system of claim 1, wherein said first member consists of said groove and said second member consists of said rim.
Claim 15
Dependent Claim
18 words
The system of claim 13, wherein said heating means is attached to said rim of said filter housing.
Claim 16
Dependent Claim
18 words
The system of claim 13, wherein said heating means is disposed in said groove of said filter frame.
References Cited (Backward Citations)
US3002870A
Cited
US3760568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |