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:
Sep. 04, 1979
Filed:
Mar. 07, 1978
Applicant:
Inventors:
A Clifton Lilly, Jr, Richmond, VA (US);
Francis M Watson, III, Richmond, VA (US);
Peter Martin, Richmond, VA (US);
John S Price, Richmond, VA (US);
Assignee:
Philip Morris Incorporated, New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324 / ; 209571 ;
Abstract
Metal layers of extreme thinness, of the order of fifty Angstroms and greater are detected by use of microwave energy so propagated as to permit determination of the presence or absence of the metal in a detection zone of limited extent outwardly of the issuance location of such propagated energy. Apparatus is provided for propagating microwave energy having a characteristic which changes with propagation distance from a maximum value at the energy issuance location to a minimum value first exhibited at the outward end of the detection zone.