Patent US4931177A successfully refreshed from Google Patents.
US4931177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite plate for filter-presses
Assignee: Individual
•
Filing: 1988-12-16
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Granted: 1990-06-05
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Expires: 2008-12-16
Abstract
Abstract Composite, unbreakable plates for filter-presses are formed by the firm assembly of, in succession for each plate, a first thin frame 1 collecting the filtrates, a grooved resilient membrane 4 to squeeze the cake, a second thin frame 3 forming a chamber for the fluid inflating the membranes, a second similar membrane, and a third thin frame similar to the first frame. The filtration composite plate cooperates with a frame or is a recess plate which is spaced for unloading of the cakes collected. Each plate or frame has a small jack operating between small extensions at the top of the frames or on top of the plates for separating the plates.
Inventors
- 👤 Alfred H. Parmentier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:17
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/12; B01D25/172; B01D25/21; B01D25/215; B01D25/28; B01D25/282; B01D25/285; B01D25/30; B01D25/32; B01D25/38; B01D25/386
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
120 words
A composite plate for a filter press, comprising, in sequence: a first thin rigid frame for collecting filtrates and receiving a filter cake; a first grooved, elastic membrane; a second thin rigid frame attached to said first membrane; a second grooved, elastic membrane, said first and second membranes and said second frame defining a fluid chamber for receiving compressed fluid to inflate said membranes; a third thin rigid frame; filter means on said first and third frames; coupling means for releasably attaching said frames, said membranes and said filter means; a rigid extension extending from a top of the composite plate; and a jack engaging said extension for selectively separating adjacent composite plates for removal of a filter cake therebetween.
Claim 2
Dependent Claim
120 words
A composite plate for a filter press, comprising, in sequence: a first thin rigid frame for collecting filtrates and receiving a filter cake; a first grooved, elastic membrane; a second thin rigid frame attached to said first membrane; a second grooved, elastic membrane, said first and second membranes and said second frame defining a fluid chamber for receiving compressed fluid to inflate said membranes; a third thin rigid frame; filter means on said first and third frames; coupling means for releasably attaching said frames, said membranes and said filter means; a rigid extension extending from a top of the composite plate; and a jack engaging said extension for selectively separating adjacent composite plates for removal of a filter cake therebetween.
Claim 3
Dependent Claim
29 words
A composite plate according to claim 1 wherein said second frame comprises an internal extension with bosses carrying said membranes to enlarge said fluid chamber in the composite plate.
Claim 4
Dependent Claim
26 words
A composite plate according to claim 1 wherein removable clamp means couple each said first, second and third frames to a fourth frame for rapid release.
Claim 5
Dependent Claim
15 words
A composite plate according to claim 1 wherein each of said rigid frames is annular.
Claim 6
Dependent Claim
20 words
A composite plate according to claim 1 wherein each of said rigid frames is peripherial and surrounds a hollow interior.
Claim 7
Dependent Claim
13 words
A composite plate according to claim 1 wherein said elastic membranes are flexible.
Claim 8
Dependent Claim
13 words
A composite plate according to claim 1 wherein said elastic membranes are elastomeric.
Claim 9
Dependent Claim
20 words
A composite plate according to claim 1 wherein said rigid frames and said elastic membranes are formed of different materials.
Claim 10
Dependent Claim
34 words
A composite plate according to claim 1 wherein said first and second membranes comprise peripheral portions trapped and retained between said first and second rigid frames and said second and third rigid frames, respectively.
Claim 11
Dependent Claim
35 words
A composite plate according to claim 1 wherein said jack is directly mounted on an adjacent composite plate and engages said extension for separating the adjacent composite plates for removal of the filter cake therebetween.
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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) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |