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:
Oct. 20, 1987
Filed:
May. 16, 1986
Applicant:
Inventors:
Lon J Muller, Groveland, MA (US);
Austin Franklin, Littleton, MA (US);
Robert W George, II, Windham, NH (US);
Assignee:
Denning Mobile Robotics, Inc., Woburn, MA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01V / ; H04B / ;
U.S. Cl.
CPC ...
367 87 ; 367137 ; 367903 ;
Abstract
An ultrasonic ranging system includes transformer means with a transformer which is selectively energized to produce a transducer drive signal. An ultrasonic transducer transmits an ultrasonic pulse in response to the drive signal and develops an echo signal upon receipt of an echo pulse derived from the ultrasonic pulse; a shunt switch is connected across a winding of the transformer and is selectively closed to quickly damp the ringing following the transmission of an ultrasonic pulse to a level substantially below the level of the echo signal to permit close ranging.