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. 09, 1991
Filed:
Jul. 02, 1990
Donald S Rimai, Webster, NY (US);
Joseph F Laukaitis, Rochester, NY (US);
Mark Zaretsky, Rochester, NY (US);
Bruno Primerano, Webster, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
In electrostatographic apparatus, the ratio of toner particle electrostatic charge-to-toner particle mass and the development rate are determined by providing a piezo device positioned to interact with toner particles. The device is periodically electrically biased to attract toner particles, and the frequency shift of the piezo device due to the mass of attracted toner particles is detected. The electrostatic charge buildup on the electrode due to the attracted toner particles is detected to determine the mass of toner. The potential on the device may be changed periodically from a potential which attracts toner to a potential which repels toner to clean the device.