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US 5,465,547 AGranted
Lightweight cementitious roofing
OwnerKarl W. Jakelinventor
Life of this patent
Estimating the term…
Abstract
A lightweight roofing shingle or tile having an elongated body with top and bottom surfaces that taper lengthwise of the body as provided by beveling of underside ribs. The shingle or tile has a composition consisting of expanded perlite, Portland cement, and an ingredient or ingredients selected from the group consisting of pumice and expanded shale, all ingredients being mixed particulate form, hydrated and cured.
Claims6
A roofing tile or shingle having:
- a) an elongated body with top and bottom surfaces which taper lengthwise of the body, said body having laterally spaced, elongated edges,
- b) said body having a composition that consists essentially of the components:
- i) expanded perlite in particulate form,
- ii) an ingredient or ingredients selected from the group consisting of pumice and expanded shale, said ingredient or ingredients being in particulate form, and
- iii) Portland cement in particulate form, said composition having been hydrated and cured,
- c) said components being present in relative weight amounts:
- =0. 8 to 1.2 part of said ingredient or ingredients
- =about 1 part of said Portland cement
- 0.3 to 0.4 part of said expanded perlite.
6 more elements
Dependencies are inferred from the claim text.