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. 08, 1977
Filed:
Jun. 25, 1975
Alfred J Gaskell, Hopkins, MN (US);
Ralph L Charnley, Minneapolis, MN (US);
Pako Corporation, Minneapolis, MN (US);
Abstract
An automatic replenishing system for maintaining the chemical concentration of the liquid in a film processing tank, which automatically energizes a replenishing pump at regular timed intervals (e.g. every 30 seconds) regardless of whether or not the control circuitry indicates a need for replenishment, and which includes an element for sensing the density and velocity of the film and for producing a combined signal which controls the running time of the pump after each energization. The replenishing system also includes a second replenishing pump for maintaining the condition of the liquid in the processing tank, which second pump is energized automatically after a predetermined number of said regular timed intervals, or after a predetermined number of said regular timed intervals in which a zero film density or non-use condition has been detected for a preset running time.