US4954255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering apparatus with pleated filtering material
Assignee: SF MULLER & PARTNER MARTINSTRASSE 55 4622 EGERKINGEN SWITZERLAND A CORP OF SWITZERLAND
•
Filing: 1989-03-20
•
Granted: 1990-09-04
•
Expires: 2009-03-20
Abstract
Abstract The filtering apparatus comprises at least one filtering material pleated in fanfold formation and arranged between the inflow or upstream side and the outflow or downstream side. Each pleat open toward the inflow or upstream side possesses a rounded base. The radius of the rounded base is in the range of 0.05 to 0.3 times the pleat depth. Each pleat open toward the outflow or downstream side terminates in an acute angle. A dimensionally stable insert is positioned within each pleat which is open toward the outflow or downstream side. The insert is preferably formed of flat material and comprises bilaterally protuberant deformations. The inserts are provided with bores at least at the protuberant deformations. Each of the inserts space the two confronting downstream sides of the associated filtering pleat and prevent that the filtering material, at high-pressure conditions, is pressed together and becomes impervious at the locations pressed against the inserts. In this filtering apparatus, filter cake consisting of filtered-out particles is easily separated and removed from the filtering material in a cleaning operation performed by a medium flowing from the outflow side to the inflow side of the filtering apparatus.
Inventors
- 👤 Roger Muller
- 👤 Giancarlo Bee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:55
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/523; B01D46/24; B01D46/2403; B01D46/2411; B01D46/66; B01D46/70; B01D46/71; B01D2201/00; B01D2201/12; B01D2201/127; B01D2265/00; B01D2265/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
186 words
A filtering apparatus having an inflow side and an outflow side, comprising: at least one filtering material pleated in fanfold manner and arranged between the inflow side and the outflow side of the filtering apparatus; said at least one pleated filtering material containing a plurality of pleats which are open towards said inflow side and a plurality of pleats which are open towards said outflow side; each pleat of said at least one pleated filtering material having a predetermined pleat depth; each one of said plurality of pleats which are open towards said inflow side containing a rounded base; said rounded base having a radius in the range of 0.05 to 0.3 times said predetermined pleat depth; each one of said plurality of pleats which are open towards said outflow side being structured to possess an acute angle; a dimensionally stable insert positioned within said each one of said plurality of pleats which are open towards said outflow side; each said dimensionally stable insert is formed of a substantially flat material comprising bilaterally protuberant deformations; and at least said bilaterally protuberant deformations being provided with holes.
Claim 2
Dependent Claim
186 words
A filtering apparatus having an inflow side and an outflow side, comprising: at least one filtering material pleated in fanfold manner and arranged between the inflow side and the outflow side of the filtering apparatus; said at least one pleated filtering material containing a plurality of pleats which are open towards said inflow side and a plurality of pleats which are open towards said outflow side; each pleat of said at least one pleated filtering material having a predetermined pleat depth; each one of said plurality of pleats which are open towards said inflow side containing a rounded base; said rounded base having a radius in the range of 0.05 to 0.3 times said predetermined pleat depth; each one of said plurality of pleats which are open towards said outflow side being structured to possess an acute angle; a dimensionally stable insert positioned within said each one of said plurality of pleats which are open towards said outflow side; each said dimensionally stable insert is formed of a substantially flat material comprising bilaterally protuberant deformations; and at least said bilaterally protuberant deformations being provided with holes.
Claim 3
Dependent Claim
44 words
The filtering apparatus as defined in claim 1, wherein: said substantially flat material having a total surface area; and the sum of said holes having a surface area amounting to between 5% and 95% of the total surface area of said substantially flat material.
Claim 4
Dependent Claim
20 words
The filtering apparatus as defined in claim 2, wherein: said holes are substantially uniformly distributed at said substantially flat material.
Claim 5
Dependent Claim
17 words
The filtering apparatus as defined in claim 3, wherein: said substantially flat material possesses a grid configuration.
Claim 6
Dependent Claim
17 words
The filtering apparatus as defined in claim 4, wherein: said substantially flat material possesses a corrugated configuration.
Claim 7
Dependent Claim
35 words
The filtering apparatus as defined in claim 5, further including: a supporting body; said corrugated configuration containing wave troughs; and the wave troughs of said corrugated configuration being aligned substantially perpendicular to said supporting body.
Claim 8
Dependent Claim
19 words
The filtering apparatus as defined in claim 6, wherein: said dimensionally stable insert is supported at said supporting body.
Claim 9
Dependent Claim
27 words
The filtering apparatus as defined in claim 6, wherein: said dimensionally stable insert extends from said supporting body up to approximately two-thirds of said predetermined pleat depth.
Claim 10
Dependent Claim
36 words
The filtering apparatus as defined in claim 5, further including: a supporting body; said corrugated configuration having wave troughs; and the wave troughs of said corrugated configuration being inclinedly aligned with respect to said supporting body.
Claim 11
Dependent Claim
19 words
The filtering apparatus as defined in claim 9, wherein: said dimensionally stable insert is supported at said supporting body.
Claim 12
Dependent Claim
27 words
The filtering apparatus as defined in claim 9, wherein: said dimensionally stable insert extends from said supporting body up to approximately two-thirds of said predetermined pleat depth.
Claim 13
Dependent Claim
29 words
The filtering apparatus as defined in claim 2 wherein: said bilaterally protuberant deformations comprise bilaterally protuberant substantially bulbous-shaped elevations; and said substantially bulbous-shaped elevations being provided with said holes.
References Cited (Backward Citations)
US2914179A
Cited
US3302796A
Cited
US3385038A
Cited
US3950256A
Cited
CH619152A5
Cited
DE2900081A1
Cited
US4488966A
Cited
US4560477A
Cited
US4619676A
Cited
US4652285A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |