US4219425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter press
Assignee: Noritake Iron Works Co Ltd
•
Filing: 1976-04-16
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Granted: 1980-08-26
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Expires: 1996-04-16
Abstract
Abstract A filter press having a slurry feed inlet arranged at the lower ends of filter cloths at locations outside filter chambers formed by filter plates thereby enabling the filter cloths to entirely open when the filter plates are opened to facilitate discharge of cakes adhered to the filter cloths.
Inventors
- 👤 Takuji Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:12
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/12; B01D25/127; B01D25/172; B01D25/28; B01D25/282; B01D25/285; B01D25/32; B01D25/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
A filter press comprising a plurality of filter plates forming filter chambers therebetween when they are in close contact with each other, said filter plates being provided with a feed inlet at their lower ends outside of said filter chambers and formed with grooves for communicating the feed inlet with said filter chambers, and a pair of two filter cloths arranged between each two adjacent filter plates, said filter cloths covering the filter chamber portions of each filter plate and covering said communicating grooves, and said two filter cloths connected at upper portions thereof and secured at peripheries of openings provided in their lower portions to the adjacent filter plates at the circumference of said feed inlet, whereby when the filter plates are opened the entire filtering surfaces of the cloths are able to separate from the filter plates thereby facilitating discharge of filter cakes adhered to said filter cloths.
Claim 2
Dependent Claim
150 words
A filter press comprising a plurality of filter plates forming filter chambers therebetween when they are in close contact with each other, said filter plates being provided with a feed inlet at their lower ends outside of said filter chambers and formed with grooves for communicating the feed inlet with said filter chambers, and a pair of two filter cloths arranged between each two adjacent filter plates, said filter cloths covering the filter chamber portions of each filter plate and covering said communicating grooves, and said two filter cloths connected at upper portions thereof and secured at peripheries of openings provided in their lower portions to the adjacent filter plates at the circumference of said feed inlet, whereby when the filter plates are opened the entire filtering surfaces of the cloths are able to separate from the filter plates thereby facilitating discharge of filter cakes adhered to said filter cloths.
Claim 3
Dependent Claim
24 words
A filter press according to claim 1, wherein the filter cloths are hung from arms provided on the uppper portions of said filter plates.
Claim 4
Dependent Claim
18 words
A filter press according to claim 2, wherein the filter cloths are hung through springs from the arms.
Claim 5
Dependent Claim
24 words
A filter press according to claim 1, wherein each pair of filter cloths are connected to one another at the upper portions by chains.
Claim 6
Dependent Claim
47 words
A filter press according to claim 1, wherein the periphery of the opening provided in the lower portion of each said filter cloth is clamped between inner walls of the feed inlet of the filter plate and filter cloth clamp means are fitted within said feed inlet.
Claim 7
Dependent Claim
25 words
A filter press according to claim 5, wherein said filter cloth clamp means is a pair of front and rear filter cloth clamping annular bodies.
Claim 8
Dependent Claim
51 words
A filter press according to claim 1 wherein alternate ones of said filter plates comprise diaphragm means for pressing outwardly from the filter chamber portions of the plate of which said means are a part, for squeezing filter cakes formed between the two filter cloths between each two adjacent filter plates.
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) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |