Patent US4301557A successfully refreshed from Google Patents.
US4301557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonclogging drain structure
Assignee: Individual
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Filing: 1977-03-07
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Granted: 1981-11-24
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Expires: 1997-03-07
Abstract
Abstract A strainer structure for sinks and the like which minimizes clogging. The wall of the strainer which engages the material to be strained is formed with channels opening inwardly of the draining space. The opposed sides of each channel are apertured to permit passage of liquid therethrough to minimize clogging of the apertures by the material to be strained. The structure is applicable to planar and curved walls.
Inventors
- 👤 Hank Walraven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:31
CPC Classifications
A; A47; A47K; A47K1/00; A47K1/14; E; E03; E03C; E03C1/00; E03C1/12; E03C1/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
A strainer structure for sinks and the like comprising: a wall having an inner surface adapted to be engaged by the material to be strained, the material of said wall being bent to provide a plurality of spaced apart channels, opening inwardly of said inner surface, each of said channels comprising a pair of opposed sides projecting outwardly of the plane of said inner surface, said sides being apertured to permit passage of liquid therethrough.
Claim 2
Dependent Claim
75 words
A strainer structure for sinks and the like comprising: a wall having an inner surface adapted to be engaged by the material to be strained, the material of said wall being bent to provide a plurality of spaced apart channels, opening inwardly of said inner surface, each of said channels comprising a pair of opposed sides projecting outwardly of the plane of said inner surface, said sides being apertured to permit passage of liquid therethrough.
Claim 3
Dependent Claim
22 words
A strainer structure according to claim 1 wherein said wall is vertically disposed and said channels are elongated in a vertical direction.
Claim 4
Dependent Claim
19 words
A strainer structure according to claim 1 wherein the material of said wall at said inner surface is imperforate.
Claim 5
Dependent Claim
19 words
A strainer structure according to claim 1 wherein said wall constitutes the vertical cylindrical sidewall of a basket strainer.
Claim 6
Dependent Claim
17 words
A strainer structure according to claim 1 wherein said wall is the bottom of a basket strainer.
Claim 7
Dependent Claim
15 words
A strainer structure according to claim 5 wherein said channels are in concentric circular rows.
References Cited (Backward Citations)
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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) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |