Double wall fire proof duct

Details Double wall fire proof duct Double wall fire proof duct

1990-05-24

1994-03-29

Robinson, Ellis P.

Stock material or miscellaneous articles

Hollow or container type article

Glass, ceramic, or sintered, fused, fired, or calcined metal...

428 357, 428 3691, 428 364, 428 361, 428 362, 428 346, 428377, 428920, 428921, 428408, 138123, 138124, 138125, 138137, 138141, 138149, 138172, 138174, 138DIG6, F16L 1108

Patent

active

052982998

ABSTRACT:
A composite plastic duct structure comprised of an outer layer of fabric material impregnated with a fire-resistant resin material and an inner liner layer of chemically corrosion resistant resin material impregnated with a fabric material. The invention includes a method wherein multiple wrappings of resin impregnated material are wound on a mandrel to form the inner and outer layers.

REFERENCES:
patent: 4053447 (1977-10-01), Shea
patent: 4076873 (1978-02-01), Shea
patent: 4107127 (1978-08-01), Shea
patent: 4769437 (1988-09-01), Blount
patent: 4942903 (1990-07-01), Jacobsen
patent: 4990409 (1991-02-01), Tanaka et al.

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