US3680707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter drier
Assignee: VIRGINIA KMP Corp A CORP OF TX
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Filing: 1971-07-30
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Granted: 1972-08-01
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Expires: 1991-07-30
Abstract
Abstract A filter drier used for refrigerants, particularly a filter drier housing embodying a medial desiccant storage chamber with fiberglass pads at either side of the desiccant storage chamber and adjacent the entrance and exit ports. The fiberglass pad adjacent the entrance port includes a means for forcing the filter pad against the desiccant without compressing the pad and thereby increasing its filtering ability.
Inventors
- 👤 Elwood R Zeek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:57
CPC Classifications
F; F25; F25B; F25B43/00; F25B43/003
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
164 words
A filter drier of the type used in refrigeration systems and having a desiccant material enclosed within a filtering housing, comprising: A. a housing having an entrance port and an exit port and a medial desiccant storage chamber; B. a first filter mount supported adjacent said entrance port and including: i. a perforated cover plate extending to the walls of said housing; ii. a cup having its open end engaging said cover plate on its entrance port side; iii. a first compressible filter supported intermediate said cup and said cover plate the first filter and the cup being substantially coextensive with said cover plate; and iv. means interposed between said cup and said entrance port yieldably urging said cup towards said cover plate; C. a second filter mount supported adjacent said exit port and including: i. a perforated pad support extending to the walls of said housing; and ii. a fibrous second filter adjacent to said pad support on its desiccant storage chamber side.
Claim 2
Dependent Claim
164 words
A filter drier of the type used in refrigeration systems and having a desiccant material enclosed within a filtering housing, comprising: A. a housing having an entrance port and an exit port and a medial desiccant storage chamber; B. a first filter mount supported adjacent said entrance port and including: i. a perforated cover plate extending to the walls of said housing; ii. a cup having its open end engaging said cover plate on its entrance port side; iii. a first compressible filter supported intermediate said cup and said cover plate the first filter and the cup being substantially coextensive with said cover plate; and iv. means interposed between said cup and said entrance port yieldably urging said cup towards said cover plate; C. a second filter mount supported adjacent said exit port and including: i. a perforated pad support extending to the walls of said housing; and ii. a fibrous second filter adjacent to said pad support on its desiccant storage chamber side.
Claim 3
Dependent Claim
19 words
A filter drier as in claim 1, wherein said first filter has a density less than said second filter.
Claim 4
Dependent Claim
13 words
A filter drier as in claim 2, wherein both said filters are fiberglass.
Claim 5
Dependent Claim
29 words
A filter drier as in claim 3, wherein said first filter has a density of 2 lb./cu. ft. and said second filter has a density of 3 lb./cu. ft.
Claim 6
Dependent Claim
24 words
A filter drier as in claim 4, wherein said filters have a diameter substantially identical to the inner diameter of said desiccant storage chamber.
Claim 7
Dependent Claim
29 words
A filter drier as in claim 1, wherein said cover plate and cup limits the degree of compression of said first filter by the media yieldably urging the cup.
Claim 8
Dependent Claim
27 words
A filter drier as in claim 6, wherein said perforated cover plate and cup supported in said first filter mount has 50 to 75 percent open area.
Claim 9
Dependent Claim
36 words
A filter drier as in claim 1, wherein the means yieldably urging the cup is in the form of a helix abutting said entrance port at one end and abutting said cup at its other end.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |