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US 3,937,860 AGranted
Filtration material
AssigneeJ. P. Stevens & Co., Inc.
InventorsIrwin J. Gusman, Carlo Strack
Life of this patent
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Abstract
A high temperature resistant filtration material is produced having outer layers of a nonwoven fabric made of fibers of an aromatic polyamide having repeating units of the formula ##SPC1## A first inner layer of nonwoven fabric made of glass fibers and a second inner layer woven from yarns of glass or said aromatic polyamide. The fibers of the layers are interentangled by needling to form an integral structure.
Claims6
A high temperature resistant filtration material comprising:
- a. Two outer layers of nonwoven fabric of fibers of an aromatic polyamide having repeating units of the formula ##SPC3##
- b. A first inner layer of nonwoven fabric of glass fibers, and
- c. A second inner layer of woven fabric made of yarns of glass or said aromatic polyamide,
- said layers being needled together into an integral structure.
1 more element
A high temperature resistant filtration material comprising:
- a. Two outer layers of nonwoven fabric of fibers which have a maximum denier of about 5 and are composed of an aromatic polyamide having repeating units of the formula ##SPC4##
- b. A first inner layer of nonwoven fabric of glass fibers having a maximum denier of about 5, said layer having a weight of about 1 to 10 ozs./yd..sup.2
- c. A second inner layer of woven fabric made of yarns of glass or said aromatic polyamide, said fabric having a weight of about 0.75 to 10 ozs./yd..sup.2
- said layers being needled together into an integral structure.
1 more element
Dependencies are inferred from the claim text.