US4296166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter of polyurethane mesh containing carbon adsorbent
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1979-09-25
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Granted: 1981-10-20
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Expires: 1999-09-25
Abstract
Abstract Air-cleaning filter element prepared by applying an adhesive agent such as a synthetic rubber latex to at least a pair of three-dimensionally mesh-structured elastic-flexible webs, disposing evenly an adsorbent material, such as activated carbon, in a size range of 0.5 mm to 10 mm in diameter between said pair of elastic-flexible webs and pressing the same elastic-flexible webs together as superimposed. The air-cleaning filter element is free from such a deterioration of the adsorbent material as caused by an adhesive and any significant fluid pressure drop on passage of fluid.
Inventors
- 👤 Fumiichi Ogino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:54
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D39/00; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249986; Y10T428/25; Y10T428/259; Y10T428/30; Y10T428/31504; Y10T428/31551; Y10T428/31554; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/153
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
102 words
Air cleaning filter element which comprises at least two sheets of three dimensional mesh-structured elastic-flexible webs prepared by selective hydrolysis of a polyurethane foam having 3 mm to 10 mm thickness as superimposed, said webs containing 9 to 31 air spaces per 25 linear millimeters, and an activated carbon adsorbent having a BET specific surface area of 500 to 2000 m 2 /g and a grain size of 1 to 5 mm in diameter, said adsorbent being deposited in an amount between 200 and 2500 grams per square meter and bonded to and between the webs with an amount of adhesive agent.
Claim 2
Dependent Claim
102 words
Air cleaning filter element which comprises at least two sheets of three dimensional mesh-structured elastic-flexible webs prepared by selective hydrolysis of a polyurethane foam having 3 mm to 10 mm thickness as superimposed, said webs containing 9 to 31 air spaces per 25 linear millimeters, and an activated carbon adsorbent having a BET specific surface area of 500 to 2000 m 2 /g and a grain size of 1 to 5 mm in diameter, said adsorbent being deposited in an amount between 200 and 2500 grams per square meter and bonded to and between the webs with an amount of adhesive agent.
Claim 3
Dependent Claim
16 words
Air-cleaning filter element as claimed in claim 1, wherein the adhesive agent is a solvent-sensitive adhesive.
Claim 4
Dependent Claim
17 words
Air-cleaning filter element as claimed in claim 1, wherein the adhesive agent is a synthetic rubber latex.
Claim 5
Dependent Claim
38 words
Air-cleaning filter element as claimed in claim 1, wherein the adhesive agent is a synthetic rubber latex whose solid body component is butadiene polymer or a copolymer from butadiene and styrene, styrene derivatives, acrylonitrile, methacrylonitrile, isoprene or isobutylene.
Claim 6
Dependent Claim
29 words
Air-cleaning filter element as claimed in claim 1, wherein the adhesive agent is used in an amount ranging from 100 g. to 500 g. per square meter of web.
Claim 7
Dependent Claim
29 words
Air-cleaning filter element as claimed in claim 1, wherein the adhesive agent is used in an amount ranging from 250 g. to 500 g. per square meter of web.
Claim 8
Independent Claim
153 words
A method for preparing an air-cleaning filter element, said air cleaning filter element comprising at least two sheets of three dimensional mesh-structured elastic flexible webs prepared by selective hydrolysis of a polyurethane foam having 3 mm to 10 mm thickness as superimposed, said webs containing 9 to 31 air spaces per 25 linear millimeters, and an activated carbon adsorbent having a BET specific surface area of 500 to 2000 mg 2 /g and a grain size of 1 to 5 mm in diameter, said adsorbent being deposited in an amount between 200 and 2500 grams per square meter and bonded to and between the webs with an amount of adhesive agent, said method comprising the steps of: (i) applying an adhesive agent to and between at least two sheets of said three dimensional mesh-structured elastic-flexible webs; (ii) disposing said adsorbent between said elastic-flexible webs; and (iii) pressing said elastic-flexible webs together as superimposed.
Claim 9
Independent Claim
153 words
A method for preparing an air-cleaning filter element, said air cleaning filter element comprising at least two sheets of three dimensional mesh-structured elastic flexible webs prepared by selective hydrolysis of a polyurethane foam having 3 mm to 10 mm thickness as superimposed, said webs containing 9 to 31 air spaces per 25 linear millimeters, and an activated carbon adsorbent having a BET specific surface area of 500 to 2000 mg 2 /g and a grain size of 1 to 5 mm in diameter, said adsorbent being deposited in an amount between 200 and 2500 grams per square meter and bonded to and between the webs with an amount of adhesive agent, said method comprising the steps of: (i) applying an adhesive agent to and between at least two sheets of said three dimensional mesh-structured elastic-flexible webs; (ii) disposing said adsorbent between said elastic-flexible webs; and (iii) pressing said elastic-flexible webs together as superimposed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |