US4239627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering member and method for manufacturing the same
Assignee: Individual
•
Filing: 1979-09-06
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Granted: 1980-12-16
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Expires: 1999-09-06
Abstract
Abstract A filtering member for use in a filter such as an oil filter for removing impurities of different sizes contained in a fluid such as a working oil in an oil pressure apparatus comprises a cylindrical body made of resilient or flexible and porous material such as fabrics, porous synthetic resin, etc, the porosity of the cylindrical body decreasing gradually toward a center thereof. The filtering member can be easily and inexpensively manufactured by winding or deforming a sheet like member made of resilient material having a uniform porosity over its thickness into a cylindrical body in such a manner that an outer portion is expanded or stretched, but an inner portion is compressed.
Inventors
- 👤 Yoneji Wada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:21
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
90 words
A filtering member for collecting impurities of different sizes contained in a fluid in a bulk filtering mode comprising: a substantially cylindrical body made of resilient and porous materials and formed by winding a rectangular sheet of resilient and uniformly porous material by one turn to form a central hollow space, the cylindrical body having a porosity which decreases gradually toward the central hollow space viewed in a radial direction, wherein the fluid to be filtered flows from an outer surface of the cylindrical body to the central hollow space.
Claim 2
Dependent Claim
90 words
A filtering member for collecting impurities of different sizes contained in a fluid in a bulk filtering mode comprising: a substantially cylindrical body made of resilient and porous materials and formed by winding a rectangular sheet of resilient and uniformly porous material by one turn to form a central hollow space, the cylindrical body having a porosity which decreases gradually toward the central hollow space viewed in a radial direction, wherein the fluid to be filtered flows from an outer surface of the cylindrical body to the central hollow space.
Claim 3
Dependent Claim
15 words
A filtering member according to claim 1, wherin said cylindrical body is made of fabrics.
Claim 4
Dependent Claim
17 words
A filtering member according to claim 1, wherein said cylindrical body is made of porous synthetic resin.
Claim 5
Independent Claim
113 words
A method for manufacturing a filtering member for use in filtering impurities of different sizes contained in a fluid in a bulk filtering mode comprising: preparing a rectangular sheet of resilient and uniformly porous material; clamping the sheet between a pair of resilient plates; and winding an assembly of the sheet and the resilient plates by one turn into a substantially cylindrical body having a central hollow space in such a manner that an outer portion of the cylindrical body is stretched and an inner portion of the cylindrical body is compressed, and the cylindrical body has a porosity gradient which decreases gradually towards the center hollow space viewed in a radial direction.
Claim 6
Independent Claim
113 words
A method for manufacturing a filtering member for use in filtering impurities of different sizes contained in a fluid in a bulk filtering mode comprising: preparing a rectangular sheet of resilient and uniformly porous material; clamping the sheet between a pair of resilient plates; and winding an assembly of the sheet and the resilient plates by one turn into a substantially cylindrical body having a central hollow space in such a manner that an outer portion of the cylindrical body is stretched and an inner portion of the cylindrical body is compressed, and the cylindrical body has a porosity gradient which decreases gradually towards the center hollow space viewed in a radial direction.
Claim 7
Dependent Claim
32 words
A method according to claim 4, wherein the assembly of the sheet like member and the resilient plates is wound into the substantially cylindrical body with the aid of a tubular mandrel.
Claim 8
Dependent Claim
18 words
A method according to claim 4, wherein a pair of wire meshes are used as said resilient plates.
References Cited (Backward Citations)
US2083546A
Cited
US3807570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |