The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 08, 1979
Filed:
Jun. 20, 1977
Applicant:
Inventor:
Dieter Bischoff, Furth, DE;
Assignee:
Firma Carl Freudenberg, Weinheim, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428 57 ; 428 61 ; 428 62 ; 428 58 ; 428517 ; 428519 ; 428520 ; 428494 ; 428451 ; 156305 ;
Abstract
A weather-resistant covering is made of three superimposed sheets of vulcanizable material such as ethylene-propylene copolymers, e.g. ethylene-propylene-diene terpolymer. The inner layer contains a vulcanization accelerator and advantageously the outer layers do not. An additional inner layer such as a non-woven textile fabric can be provided to increase strength and dimensional stability. A roof can be covered by placing a plurality of strips of such covering side-by-side with slight overlap, welding them together into impervious seams by application of a volatile solvent or swelling agent for the outer layers.