US4668392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter plate for filter presses
Assignee: Chemokomplex Vegyipori Export-Import
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Filing: 1985-02-19
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Granted: 1987-05-26
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Expires: 2005-02-19
Abstract
Abstract A one-piece filter plate comprises a pair of webs surrounded by a flange, the webs and flange being integral with each other and of one-piece plastic construction. A pressure medium can be introduced between the webs to force them apart to dewater a filter cake that has built up between the outer surfaces of the webs and the corresponding outer surfaces of the next-adjacent filter plates. The filter plate can be made by vulcanizing together two halves along a medial plane of symmetry.
Inventors
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Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:20
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/12; B01D25/21; B01D25/215
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A one-piece filter plate having a web in the form of two walls and a surrounding flange, each of said walls being of one piece with said flange, and means for introducing a fluid under pressure between said walls, the flange having a rib thereon between the walls, the walls adjacent the flange having the same shape as and lying against the sides of the rib when filter cake presses the walls toward each other, said walls extending into the flange with a uniform wall thickness, said filter plate comprising two halves each including one of said walls and half of said flange and rib, integrally secured together along a medial plane, said walls and flange being plastic, and a flat stiffener plate secured between said two halves, margins of the stiffener plate being secured between the flange portions of said halves, said flange portions extending edgewise outwardly beyond said stiffener plate and being vulcanized together edgewise outwardly beyond said stiffener plate, said halves of said rib being disposed against opposite sides of said stiffener plate.
Claim 2
Dependent Claim
176 words
A one-piece filter plate having a web in the form of two walls and a surrounding flange, each of said walls being of one piece with said flange, and means for introducing a fluid under pressure between said walls, the flange having a rib thereon between the walls, the walls adjacent the flange having the same shape as and lying against the sides of the rib when filter cake presses the walls toward each other, said walls extending into the flange with a uniform wall thickness, said filter plate comprising two halves each including one of said walls and half of said flange and rib, integrally secured together along a medial plane, said walls and flange being plastic, and a flat stiffener plate secured between said two halves, margins of the stiffener plate being secured between the flange portions of said halves, said flange portions extending edgewise outwardly beyond said stiffener plate and being vulcanized together edgewise outwardly beyond said stiffener plate, said halves of said rib being disposed against opposite sides of said stiffener plate.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |