US3683600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter apparatus to protect a switch chamber against moisture
Assignee: American Crucible Products Co
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Filing: 1970-06-03
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Granted: 1972-08-15
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Expires: 1990-06-03
Abstract
Abstract The combination of a submersible sump pump, and the like, having a switch chamber with a breather tube extending therefrom and means for preventing moisture and water vapor from passing into the switch chamber through the breather tube as well as such means including a separable hollow body with inlet and outlet ports separated by means which is permeable to air, but not to moisture and water vapor.
Inventors
- 👤 Patricia A Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:36
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/0072; B; B60; B60P; B60P3/00; B60P3/22; B60P3/224; H01F; H01F27/00; H01F27/02; H01F27/04; H01H; H01H9/00; H01H9/02; H01H9/04; H01H9/047
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
In a submersible pump having a switch chamber, pressure operated switch means in the switch chamber and a breather tube for communicating between said switch chamber and the atmosphere adjacent said pump, the improvement which comprises a filter housing having a first opening connected to said breather tube and a second opening communicating with the atmosphere, and a filter membrane supported within said housing between said first and second openings, said filter membrane being permeable to air and impermeable to moisture and water vapor, Whereby said switch chamber is vented to atmosphere while being maintained free of atmospheric moisture.
Claim 2
Dependent Claim
99 words
In a submersible pump having a switch chamber, pressure operated switch means in the switch chamber and a breather tube for communicating between said switch chamber and the atmosphere adjacent said pump, the improvement which comprises a filter housing having a first opening connected to said breather tube and a second opening communicating with the atmosphere, and a filter membrane supported within said housing between said first and second openings, said filter membrane being permeable to air and impermeable to moisture and water vapor, Whereby said switch chamber is vented to atmosphere while being maintained free of atmospheric moisture.
Claim 3
Dependent Claim
30 words
The improvement according to claim 1 with fitting means disposed in said first opening for interconnection with the breather tube to provide communication between said breather tube and filter membrane.
Claim 4
Dependent Claim
92 words
The improvement according to claim 2 in which said housing comprises first and second members, each said member has an end wall, lateral sides, an open end and a hollow interior, one said member is threaded internally and the other is threaded externally, said other member has a flat surface surrounding said open end, said membrane is held against said flat surface and covers said open end into the interior of said other member, and first and second openings are provided in said end walls of said first and second members, respectively.
Claim 5
Dependent Claim
23 words
The improvement according to claim 3 in which said flat surface is transverse of said other member and said membrane is glued thereto.
Claim 6
Dependent Claim
14 words
The improvement according to claim 3 in which said first member is threaded internally.
References Cited (Backward Citations)
US2976950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |