US4669167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing filter bag
Assignee: Pall Filter Specialists Inc
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Filing: 1985-10-29
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Granted: 1987-06-02
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Expires: 2005-10-29
Abstract
Abstract A method of removing a self-retaining filter bag from a filter housing by flexing the upper margin of the bag to free the bag from the housing and then withdrawing the bag from the housing.
Inventors
- 👤 Gunther E. Asterlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:24
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/23; B01D29/27; B01D29/96; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49815; Y10T29/49822; Y10T29/49824; Y10T29/49826; Y10T29/49863; Y10T29/4987; Y10T29/49872
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A method for removing a filter bag from a filter housing, said bag including a flexible shape-retaining upper marginal ring portion and a filtering portion depending from said marginal portion, opposed handles connected to said marginal ring portion, said housing having an annular retaining part with said marginal ring portion being restrictively secured within said housing by said retaining part, said method of removing said bag from said housing includes the following steps: (a) Grasping both said handles in one hand; (b) Urging said handles towards each other causing said marginal ring portion to flex at spaced locations thereby freeing a substantial portion of the marginal ring portion from said housing retaining part; and (c) Withdrawing said bag out of said housing while still grasping said handles.
Claim 2
Independent Claim
127 words
A method for removing a filter bag from a filter housing, said bag including a flexible shape-retaining upper marginal ring portion and a filtering portion depending from said marginal portion, opposed handles connected to said marginal ring portion, said housing having an annular retaining part with said marginal ring portion being restrictively secured within said housing by said retaining part, said method of removing said bag from said housing includes the following steps: (a) Grasping both said handles in one hand; (b) Urging said handles towards each other causing said marginal ring portion to flex at spaced locations thereby freeing a substantial portion of the marginal ring portion from said housing retaining part; and (c) Withdrawing said bag out of said housing while still grasping said handles.
References Cited (Backward Citations)
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Cited
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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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |