US4619675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for air cleaners
Assignee: Midori Anzen Co Ltd
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Filing: 1984-06-22
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Granted: 1986-10-28
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Expires: 2004-06-22
Abstract
Abstract A filter used for air cleaners. In this filter, a filter medium, which is obtained by folding a piece of elongated filter paper so that ridges and valleys are formed alternately, fitting spacers on this folded filter paper so as to maintain the spaces among the ridges and valleys properly, and then bending the resultant product so that the ridges and valleys extend in the radial direction, is set in a filter body having air inlet and outlet ports. A cushion material is inserted between the contact portions of the filter body and filter medium.
Inventors
- 👤 Moritsuna Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:57
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/523; B01D46/10; B01D46/106; B01D2201/00; B01D2201/12; B01D2201/127
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
185 words
A filter for air cleaners, comprising a filter medium obtained by folding a piece of elongated filter paper so that ridges and valleys are formed alternately, fitting spacers only onto a portion of said folded filter paper which does not include the edges of the folded filter paper so as to maintain the distances between the adjacent ridges and valleys properly, and then bending the resultant product to form a circular body with inner and outer circumferential surfaces and with the ridges and valleys extending in the radial direction, a filter body having inlet and outlet ports and circular inner and outer circumferential walls, said filter medium being set in said filter body between said inner and outer circumferential walls, a cushion material inserted between the inner circumferential surface of said filter medium and the inner wall of said filter body, and a cushion material bonded to the outer wall and inserted between the outer circumferential wall of said filter medium and the outer wall of said filter body, a prefilter member covering said air inlet port and an after-filter member covering said outlet port.
Claim 2
Dependent Claim
185 words
A filter for air cleaners, comprising a filter medium obtained by folding a piece of elongated filter paper so that ridges and valleys are formed alternately, fitting spacers only onto a portion of said folded filter paper which does not include the edges of the folded filter paper so as to maintain the distances between the adjacent ridges and valleys properly, and then bending the resultant product to form a circular body with inner and outer circumferential surfaces and with the ridges and valleys extending in the radial direction, a filter body having inlet and outlet ports and circular inner and outer circumferential walls, said filter medium being set in said filter body between said inner and outer circumferential walls, a cushion material inserted between the inner circumferential surface of said filter medium and the inner wall of said filter body, and a cushion material bonded to the outer wall and inserted between the outer circumferential wall of said filter medium and the outer wall of said filter body, a prefilter member covering said air inlet port and an after-filter member covering said outlet port.
Claim 3
Dependent Claim
49 words
A filter for air cleaners according to claim 1, wherein said filter body has one or a plurality of partitions therein by which the interior of said filter body is divided into concentric spaces, said filter medium being fitted in each of the concentric spaces defined by said partition.
Claim 4
Dependent Claim
17 words
A filter for air cleaners according to claim 2, wherein said partition consists of a cushion material.
References Cited (Backward Citations)
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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) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |