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:
Jan. 22, 1991
Filed:
Feb. 01, 1990
Joseph F Laukaitis, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Apparatus and method for controlling the development rate of an electrostatic photocopying machine. An electrode plate is positioned adjacent to the toning brush to form a capacitive circuit in which a portion of the dielectric is the toner mixture used in developing images in the machine. Reversing polarities are applied to the electrode plate to alternately make it attract and repel toner. During the attracting or developing polarity, the transient behavior of the toning current is detected and this transient response is used to determine the development rate of the apparatus. In the specific embodiment described, the transient characteristic detected is the time required for the charging current to decay to a predetermined value.