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:
Feb. 27, 1979
Filed:
Jul. 29, 1977
Michael G Reid, Rochester, NY (US);
Stephen R Rowell, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Apparatus for monitoring the concentration of toner particles in an electrographic developer mixture having toner and carrier particles in which a first signal is produced representative of the reflectivity of the developer mixture and an offset signal is produced representative of changes in the reflectivity of the developer mixture caused by the build up of a film of toner on the carrier particles. A computation device such as a digital computer in response to the first signal and the offset signal provides a correct representation of the concentration of toner in the developer mixture. When the toner concentration is below a desired level, the computation device actuates a toner replenishment mechanism which adds fresh toner to the developer mixture.