EP0121299A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Molded nonwoven shaped articles
Assignee: 3M Co
•
Filing: 1984-02-01
•
Granted: —
•
Expires: 2004-02-01
Abstract
Abstract The disclosure relates to a shaped porous article useful as a breath filtering face mask formed from an initially nonunified nonwoven fibrous three dimensional network of one or more types of fibers, at least one of said types of fibers having a continuous coating of a thermally sensitive bonding resin thereon, the fibrous network being thermally unified solely by the coating.
Inventors
- 👤 Harvey J. C/O Minnesota Mining Berg
- 👤 George E. C/O Minnesota Mining Krankkala
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 08:07
CPC Classifications
A; A41; A41D; A41D13/00; A41D13/05; A41D13/11; A41D13/1107; A41D13/1138; A41D13/1146; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/163
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
94 words
A shaped porous article useful as a breath filtering face mask comprising an initially nonunified nonwoven fibrous three dimensional network formed from fibers which are dimensionally stable at the shaping conditions, said fibers having a continuous coating of a thermally sensitive bonding resin thereon, said fibrous network being thermally unified solely by said coating mainly at the crossing points of the fibers, said article having a stiffness value of at least 0.2 pounds and being capable of passing 32 liters of air therethrough at a pressure drop of not over 15 nm of water.
Claim 2
Dependent Claim
94 words
A shaped porous article useful as a breath filtering face mask comprising an initially nonunified nonwoven fibrous three dimensional network formed from fibers which are dimensionally stable at the shaping conditions, said fibers having a continuous coating of a thermally sensitive bonding resin thereon, said fibrous network being thermally unified solely by said coating mainly at the crossing points of the fibers, said article having a stiffness value of at least 0.2 pounds and being capable of passing 32 liters of air therethrough at a pressure drop of not over 15 nm of water.
Claim 3
Dependent Claim
37 words
A shaped porous article according to claim 1 wherein said fibers comprise polyester sheathed fibers comprising a core of polyethylene terephthalate and a sheath of a random copolyester composite of terephthalic acid units and isophthalic acid units.
Claim 4
Dependent Claim
50 words
A shaped porous article according to either of claims 1 and 2 wherein said initially nonunified nonwoven fibrous three dimensional network is famed from a mixture of two types of fibers, at least one of said types of fibers having a continuous coating of a thermally sensitive bonding resin thereon.
Claim 5
Dependent Claim
34 words
A shaped porous article according to any one of claims 1 to 3 additionally including one or more of polyester staple fibers, electrically charged fibrillated isotactic polypropylene fibers, viscose rayon fibers, wood pulp fibers.
Claim 6
Dependent Claim
31 words
A shaped porous article according to any one of claims 1 to 4 wherein said continuous coating of thermally sensitive bonding resin on said fibers has been applied from a liquid.
Claim 7
Dependent Claim
35 words
A shaped porous article according to any one of claims 1 to 5 wherein said fiber is polyester and said thermally sensitive bonding resin is selected from ethylene-vinylacetate, amorphous polyester, plasticized polyvinyl chloride or acrylic.
Claim 8
Dependent Claim
33 words
A shaped porous article according to any one of claims 1 to 6 wherein said fiber is rayon and said thermally sensitive bonding resin is selected from ethylene-vinylacetate, amorphous polyester or polyvinyl chloride.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.