Patent US3014027A successfully refreshed from Google Patents.
Patent US3905942A successfully refreshed from Google Patents.
Patent US5820644A successfully refreshed from Google Patents.
US5820644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter
Assignee: Bridgestone Corp
•
Filing: 1997-04-24
•
Granted: 1998-10-13
•
Expires: 2017-04-24
Abstract
Abstract An air filter suitably usable in an air cleaner, room air-conditioner or especially in car air-conditioners in which air is driven at a high speed. The air filter is made of a pleated polyurethane foam having on one or both sides thereof a three-dimensional network skeletal structure of micro cells.
Inventors
- 👤 Hisashi Mori
- 👤 Masami Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:09
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/18; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1669; B01D39/1676; B01D39/1692; B01D46/00; B01D46/0027; B01D46/0038; B01D46/10; B01D46/52; B01D46/521; B01D53/00; B01D53/02; B01J; B01J20/00; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28014; B01J20/28026; B01J20/2803; B01J20/28042; B01J20/28045; B01J20/28054; B01J20/28069; B32B27/00; B32B27/32; B32B29/00; B32B29/002; B32B29/007; B32B5/02; B32B5/022; B32B5/22; B32B5/24; B32B5/245; B32B5/32; C; C08; C08J; C08J9/00; C08J9/36; C08J9/365; B01D2253/00; B01D2253/10; B01D2253/102; B01D2253/104; B01D2253/106; B01D2253/20; B01D2253/202; B01D2253/30; B01D2253/302; B01D2253/311; B01D2253/34; B01D2253/342; B01D2259/00; B01D2259/45; B01D2259/4508; B01D2259/4566; B01D2273/00; B01D2273/18; B01D2275/00; B01D2275/10; B01D2279/00; B01D2279/50; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S55/00; Y10S55/13
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
An air filters comprising: a polyurethane foam sheet having on at least one side thereof a three-dimensional porous network skeletal structure of micro cells; a non-solvent binder layer applied to and into a surface of said porous network skeletal structure of said polyurethane foam; a layer of adsorbent particles attached at one part thereof to said binder layer while a remaining part thereof is exposed, said adsorbent particles having a mean particle size ranging from 1/50 to 1/1.5 of a mean inter-skeletal distance of said polyurethane foam; and a combination of said polyurethane foam sheet, said binder layer, and said layer of adsorbent particles comprising a filter matrix, said filter matrix having a pleated configuration.
Claim 2
Dependent Claim
115 words
An air filters comprising: a polyurethane foam sheet having on at least one side thereof a three-dimensional porous network skeletal structure of micro cells; a non-solvent binder layer applied to and into a surface of said porous network skeletal structure of said polyurethane foam; a layer of adsorbent particles attached at one part thereof to said binder layer while a remaining part thereof is exposed, said adsorbent particles having a mean particle size ranging from 1/50 to 1/1.5 of a mean inter-skeletal distance of said polyurethane foam; and a combination of said polyurethane foam sheet, said binder layer, and said layer of adsorbent particles comprising a filter matrix, said filter matrix having a pleated configuration.
Claim 3
Dependent Claim
20 words
The air filter as set forth in claim 1, wherein said polyurethane foam has 6 to 80 pores per inch.
Claim 4
Dependent Claim
142 words
An air filter, comprising: a polyurethane foam having on one or both sides thereof a three-dimensional network porous skeletal structure of micro cells; a non-solvent binder layer applied to and into the surface of said porous skeletal structure of said polyurethane foam; a layer of adsorbent particles attached at one part thereof to said binder layer while the remaining part thereof is exposed, said adsorbent particles having a mean particle size ranging from 1/50 to 1/1.5 of the mean inter-skeletal distance of said polyurethane foam, a combination of said polyurethane foam, said binder layer and said layer of adsorbent particles comprising a matrix; and a dust filter layer laminated to a surface of said matrix, said dust filter layer including at least one of a polyurethane foam, nonwoven fabric and paper, the assembly of said matrix and dust filter layer being pleated.
Claim 5
Dependent Claim
142 words
An air filter, comprising: a polyurethane foam having on one or both sides thereof a three-dimensional network porous skeletal structure of micro cells; a non-solvent binder layer applied to and into the surface of said porous skeletal structure of said polyurethane foam; a layer of adsorbent particles attached at one part thereof to said binder layer while the remaining part thereof is exposed, said adsorbent particles having a mean particle size ranging from 1/50 to 1/1.5 of the mean inter-skeletal distance of said polyurethane foam, a combination of said polyurethane foam, said binder layer and said layer of adsorbent particles comprising a matrix; and a dust filter layer laminated to a surface of said matrix, said dust filter layer including at least one of a polyurethane foam, nonwoven fabric and paper, the assembly of said matrix and dust filter layer being pleated.
Claim 6
Dependent Claim
36 words
The air filter as set forth in claim 1, wherein said matrix has formed on an upstream side thereof a dust filter layer made of a polypropylene nonwoven fabric bound on a core comprising polypropylene net.
Claim 7
Dependent Claim
34 words
The air filter as set forth in claim 1, wherein said matrix has formed on a downstream side thereof a dust filter layer made of one of a polyurethane foam, nonwoven fabric and paper.
References Cited (Backward Citations)
US2961710A
Cited
US3171820A
Cited
US4178161A
Cited
JPS5520630A
Cited
US4296166A
Cited
JPS5551414A
Cited
DE2927287A1
Cited
US4530817A
Cited
JPS6014909A
Cited
US4541847A
Cited
JPH0957050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-10-12 | 2002-04-13 | 2002-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-10-12 | 2006-04-13 | 2006-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-10-12 | 2010-04-13 | 2010-10-13 | $7700.00 | Window Closed / Lapsed |