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. 28, 1991
Filed:
May. 25, 1990
S Riaz Hasan, Palatine, IL (US);
Louis Thomas, Maywood, IL (US);
Illinois Tool Works Inc., Glenview, IL (US);
Abstract
An improved method of attaching a roofing membrane to an underlayment and an improved roofing construction made by the improved method. A screw and a composite roofing washer are used to attach the membrane to the underlayment. The composite roofing washer is an interlocked assemblage of a metal roofing washer and a thermoplastic insert. After the screw has been driven, the thermoplastic insert is heated so as to cause some of the material of the thermoplastic insert to flow over the head of the screw, thereby to heat-seal the screw to the thermoplastic insert. The thermoplastic insert may be so heated when the roofing membrane is welded to another like membrane at an overlapped seam.