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US 4,755,409 AGranted
Waterproofing laminate
AssigneeHyload Corporation
InventorAlex W. Harkness
Life of this patent
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Abstract
A waterproofing laminate suitable for use in roofs, floors or other surfaces where waterproofing is desired contains a reinforcing sheet, first and second bitumen layers secured to opposite surfaces of the reinforcing sheet, first and second compound bitumen layers secured to the bitumen layers, an elastomeric sheet secured to the first compound bitumen layer and a release sheet secured to the second compound bitumen layer. Certain preferred materials for use in the laminate are recited.
Claims5
A waterproof laminate comprising
- a reinforcing sheet,
- a first bitumen layer secured to one surface of said reinforcing sheet,
- a second bitumen layer secured to the other surface of said reinforcing sheet,
- a first compound bitumen layer secured to said first bitumen layer
- a second compound bitumen layer secured to said second bitumen layer,
- said first and second compound bitumen layer containing a material selected from the group consisting of natural rubber, synthetic rubber, natural resin, and synthetic resin,
- said elastomeric sheet containing a material selected from the group consisting of polyisobutylene, chlorinated polyethylene, natural rubber, polyvinyl chloride and ethylene vinyl acetate,
- an elastomeric sheet secured to said first compound bitumen layer, and
- a release sheet secured to said second compound bitumen layer, whereby removal of said release sheet will permit securement of said waterproofing laminate to a surface.
6 more elements
Dependencies are inferred from the claim text.