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. 23, 1986
Filed:
Jul. 17, 1984
Koji Suzuki, Yokohama, JP;
Yoshihiro Kawatsura, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A surface potentiometer having a movable shield member for intermittently shielding a clearance between a measurement electrode and a surface to be measured to cause a potential of the surface to be measured to be induced as an AC signal in the measurement electrode. A voltage greater than or equal to a maximum value of the potential of the surface to be measured or a voltage smaller than or equal to a minimum value of the surface potential is applied as a bias voltage to the shield member to thereby permit discrimination between positive and negative polarities of the surface potential. A rectifier is provided for rectifying the voltage induced in the electrode, and an operational device substracts the bias voltage from the rectified voltage.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile