Patent US5344559A successfully refreshed from Google Patents.
US5344559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cartridge
Assignee: Votech Filter GmbH
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Filing: 1993-02-05
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Granted: 1994-09-06
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Expires: 2013-02-05
Abstract
Abstract The invention relates to a filter cartridge including a filter element equipped with two annular flanges and two supporting cages. In order to be able to disassemble the filter cartridge for the purpose of facilitating disposal, the two annular flanges are provided with inner and outer threads. Four mounting rings are provided with mating inner and outer threads and can be screwed onto the annular flanges while being supported on the two supporting cages. Once the threaded rings are tightened, the filter element is under tension.
Inventors
- 👤 Maarten H. Van Ooijen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:31
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
97 words
A filter cartridge comprising: a hollow cylindrical filter element having two axial ends and being under axial tension an annular flange at each one of said two axial ends; at least one supporting cage coaxial with the filter element; at least one mounting ring between the annular flange at one of said axial ends and the supporting cage for establishing a releasable connection between the mounting ring and the supporting cage; and tensioning means between the mounting ring and the annular flange for tensioning the filter element, with the mounting ring being supported on the supporting cage.
Claim 2
Dependent Claim
97 words
A filter cartridge comprising: a hollow cylindrical filter element having two axial ends and being under axial tension an annular flange at each one of said two axial ends; at least one supporting cage coaxial with the filter element; at least one mounting ring between the annular flange at one of said axial ends and the supporting cage for establishing a releasable connection between the mounting ring and the supporting cage; and tensioning means between the mounting ring and the annular flange for tensioning the filter element, with the mounting ring being supported on the supporting cage.
Claim 3
Dependent Claim
33 words
A filter cartridge according to claim 1, wherein said annular flange is comprised of plastic or a cellulose filter material and is fixed to the filter element by casting, injection molding or gluing.
Claim 4
Dependent Claim
33 words
A filter cartridge according to claim 1, wherein said supporting cage has a front edge and said mounting ring has an underside which is supported by said front edge of the supporting cage.
Claim 5
Dependent Claim
19 words
A filter cartridge according to claim 1, wherein said supporting cage and the mounting ring are comprised of metal.
Claim 6
Dependent Claim
35 words
A filter cartridge according to claim 1, wherein said supporting cage has a front edge and said mounting ring has an underside having an annular groove to accommodate said front edge of the supporting cage.
Claim 7
Dependent Claim
15 words
A filter cartridge according to claim 5, wherein said annular groove has a V-shaped profile.
Claim 8
Dependent Claim
17 words
A filter cartridge according to claim 1, and further comprising an annular seal on said annular flange.
Claim 9
Dependent Claim
64 words
A filter cartridge according to claim 1, wherein the annular flange of the filter element includes at least one thread; the mounting ring includes a corresponding mating thread for screwing onto the thread of the annular flange and establishing said releasable connection between the mounting ring and the supporting cage; and wherein said tensioning means comprises the annular flange and the corresponding mating thread.
Claim 10
Dependent Claim
21 words
A filter cartridge according to claim 8, wherein said annular flange thread and the corresponding mating thread are multi-turn trapezoidal threads.
Claim 11
Dependent Claim
77 words
A filter cartridge according to claim 1, wherein the annular flange includes a ring of threaded bores; and the mounting ring is seated above the annular flange and includes corresponding screw holes that mate with the threaded bores; and further comprising head screws penetrating the screw holes and screwed into the threaded bores for establishing the releasable connection between the mounting ring and the supporting cage and, when tightened, serving as tensioning means for the filter element.
Claim 12
Dependent Claim
66 words
A filter cartridge according to claim 1, wherein the annular flange includes at least one annular shoulder; and said tensioning means comprises rotary cylinders distributed over the circumference of said mounting ring, said rotary cylinders having eccentric pins engaging underneath the annular shoulder to establish the releasable connection between the mounting ring and the supporting cage whereby the rotary cylinders, when rotated, tension the filter element.
Claim 13
Dependent Claim
114 words
A filter cartridge according to claim 1, wherein the annular flange has a side having plural blind bores and at least one annular ledge underneath said blind bores and wherein the mounting ring has a side having at least one annular groove for accommodating said annular ledge; and further comprising a traction ring coaxial with said annular flange having radial holding screws for engaging the blind bores so as to establish the releasable connection between the mounting ring and the supporting cage, said traction ring further including plural tension screws penetrating said traction ring and resting on said annular flange, whereby the traction ring serves as the tensioning means for tensioning the filter element.
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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) | 1997-09-05 | 1998-03-07 | 1998-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-05 | 2002-03-07 | 2002-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-05 | 2006-03-07 | 2006-09-06 | $7700.00 | Window Closed / Lapsed |