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:
Nov. 15, 1988
Filed:
Sep. 03, 1987
Savin Corporation, Stamford, CT (US);
Abstract
The disclosure is directed to liquid electrophotographic copying equipment and more particularly to an apparatus to dispense a liquid charge director composition to a reservoir that contains a liquid developer composition. Generally, the apparatus comprises a charge director reservoir including a pressure cell arranged below the liquid level of the charge director reservoir. The pressure cell has a volume to contain a predetermined amount of liquid charge director composition. The pressure cell is provided with an opening to permit a flow of liquid charge director composition from the charge director reservoir and into the interior of the pressure cell and vice versa. A tubular conduit extends from the interior of the pressure cell to the reservoir that contains the liquid developer composition to provide fluid communication therebetween. A controlled pulse of air is directed into the interior of the pressure cell to force all of the liquid charge director composition within the pressure cell from the pressure cell, with portions of the liquid charge director composition flowing through each of the opening and the tubular conduit. Pursuant to the invention, the ratio of the diameter of the opening to the diameter of the tubular conduit is fixed such that the controlled pulse of air causes a preselected amount of liquid charge director composition to flow through the tubular conduit and into the reservoir that contains the liquid developer composition and causes the remaining portion of the liquid charge director composition to flow through the opening and into the charge director reservoir.