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:
Jun. 19, 1984
Filed:
Jul. 20, 1981
Applicant:
Inventor:
Heinz Walker, Kummersbruck, DE;
Assignee:
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324327 ; 324236 ; 331 65 ; 3311 / ; 336 83 ;
Abstract
A contactless inductive proximity switch contains an oscillator which is formed of a parallel arrangement of an oscillator coil and an oscillator capacitor connected to an integrated circuit. The oscillator coil is provided with a relatively few number of wire turns so as to occupy a relatively small portion of the volume in the cup core. The capacity of the oscillator capacitor is selected to match the oscillator coil. A hard water is retained within the cup core by a casting resin, and protects the oscillator coil from damage.