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:
Jan. 11, 1994
Filed:
May. 29, 1992
Applicant:
Inventors:
James A Davis, Uniontown, OH (US);
Kenneth R Lucas, Copley, OH (US);
Assignee:
Bridgestone Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
378 45 ; 378210 ;
Abstract
The present invention provides a method for positive product identification using tagging materials such as barium sulfate, manganese dioxide or mixtures thereof. Such materials may be employed, for example, in the dusting agent used in roofing materials, and applied to one or both sides of rubber roofing sheeting or admixed with the compounding ingredients during the preparation of the sheeting composition. The tagging materials can be detected and identified in the finished product by X-ray fluorescence spectroscopy.