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US5206061A Expired / Lapsed US ⏱️ 0.0 years remaining

Dust-proof headgear

Assignee: Toray Industries Inc
•
Filing: 1989-05-26
•
Granted: 1993-04-27
•
Expires: 2009-05-26
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Abstract

Abstract A dust-proof headgear which, although having a simple construction, exhibits an excellent dust-proof performance to thereby remarkably reduce a scattering of hair, dandruff and dust from the wearer's head, while exhibiting a high air-permeability to thus eliminate any feeling of sultryness or stuffyness even when worn for a long time. The dust-proof headgear is made of a material having, as a major component thereof, an electret non-woven fabric having a surface electrostatic charge density of 1×10 -10 Coulomb/cm 2 or greater and an air-permeability of between 10 cc/cm 2 .sec and 1000 cc/cm 2 .sec. The headgear of the invention is highly effective for use in various fields of industry in which environmental contamination by contaminants from the heads of workers or habitants is strictly forbidden, e.g., the foodstuff industry, electronic industry, precision machining industry, and medical industry.

Inventors

  • 👤 Katsutoshi Ando
  • 👤 Ryoichi Togashi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 09:05
CPC Classifications
A; A42; A42B; A42B1/00; A42B1/012; A42B1/04; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317; Y10T428/1321; Y10T442/00; Y10T442/60; Y10T442/659; Y10T442/66; Y10T442/68

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 44 words
A dust-proof headgear made from a material having, as a major component thereof, an electret non-woven fabric having a surface electrostatic charge density of 1×10 -10 Coulomb/cm 2 or greater and an air-permeability of between 10 cc/cm 2 .sec and 1000 cc/cm 2 sec.
Claim 2
Dependent Claim 44 words
A dust-proof headgear made from a material having, as a major component thereof, an electret non-woven fabric having a surface electrostatic charge density of 1×10 -10 Coulomb/cm 2 or greater and an air-permeability of between 10 cc/cm 2 .sec and 1000 cc/cm 2 sec.
Claim 3
Dependent Claim 26 words
A dust-proof headgear according to claim 1, wherein said electret non-woven fabric is made from melt-blown fibers having a mean fineness of 0.5 denier or finer.
Claim 4
Dependent Claim 31 words
A dust-proof headgear according to claim 2, wherein said electret non-woven fabric is a melt-blown fiber non-woven fabric made of polypropylene fibers having a mean fineness of 0.1 denier or finer.
Claim 5
Dependent Claim 30 words
A dust-proof headgear according to claim 1, wherein said electret non-woven fabric material is a spun-bonded long-fiber non-woven fabric having a mean fineness of fibers of 10 denier or finer.
Claim 6
Dependent Claim 29 words
A dust-proof headgear according to claim 4, wherein said electret non-woven fabric is a spun-bonded long-fiber non-woven fabric composed of fibers having a cross-sectional flatness not smaller than 1.2.
Claim 7
Dependent Claim 23 words
A dust-proof headgear according to claim 1, wherein the weight of said electret non-woven fabric is not greater than 50 g/m 2 .
Claim 8
Dependent Claim 25 words
A dust-proof headgear according to claim 1, wherein said electret non-woven fabric is combined with other materials to thereby form a composite or laminate material.
Claim 9
Dependent Claim 32 words
A dust-proof head gear according to claim 1, wherein said electret non-woven fabric is a composite or laminate material having an electret melt-blown nonwoven fabric and an electret spun-bonded long-fiber non-woven fabric.
Claim 10
Dependent Claim 32 words
A dust-proof headgear according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein a substantially elastic material or a tightening member is provided around the opening of said headgear.
Claim 11
Dependent Claim 20 words
A dust-proof headgear according to claim 9, wherein said elastic material is a string or a belt-like member of rubber.
Claim 12
Dependent Claim 15 words
A dust-proof headgear according to claim 9, wherein said tightening member is a string-like member.
Claim 13
Dependent Claim 17 words
A dust-proof headgear according to claim 1, wherein said electret non-woven fabric has a substantially white color.

References Cited (Backward Citations)

US4375718A Cited
US4909975A Cited
US4781966A Cited
US5143767A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1996-04-26 1996-10-26 1997-04-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2000-04-26 2000-10-26 2001-04-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2004-04-26 2004-10-26 2005-04-27 $7700.00 Window Closed / Lapsed

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