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. 30, 1998
Filed:
Apr. 13, 1995
Vladimir Kraz, Santa Cruz, CA (US);
Credence Technologies, Inc., Santa Cruz, CA (US);
Abstract
Apparatus for detection of the electro-magnetic field and measurement of its strength in the near field. The apparatus includes an antenna suited to receive specified type of the electro-magnetic field; a detector to convert received signal into DC voltage, a summing device and a potentiometer to set the reference level, a DC amplifier for amplification of resulting signal. The apparatus further includes a voltage-controlled oscillator and a speaker that produces an audible tone with the pitch proportional to the field strength. The apparatus further includes a squelch circuit that blocks the sound when the field strength gets lower than the preset range. The apparatus further includes LED level bar as visual means of indicating field strength. The apparatus is constructed as a fully self-contained unit needing no additional equipment for its operation.