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:
Apr. 22, 1986
Filed:
May. 30, 1984
Applicant:
Inventor:
John Dimeff, San Jose, CA (US);
Assignee:
Mark Telephone Products, Inc., Santa Clara, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73 5 / ; 73 4 / ;
Abstract
Apparatus for processing a composite noise signal containing sonic and ultrasonic components generally in a frequency range of about 20 Hz-100 KHz to make audible both components of the signal includes a heterodyne circuit operable in response to a rectangular wave local oscillator signal to produce output signals which are within the frequency range of human hearing.