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:
May. 23, 1989
Filed:
Nov. 09, 1987
Maurice J Forkert, Fort Wayne, IN (US);
William D Key, Leo, IN (US);
Tokheim Corporation, Fort Wayne, IN (US);
Abstract
An apparatus for and method of calibrating a fluid meter having an output transformable into a series of digital pulses, where each pulse represents a certain volume of liquid through the meter that changes as a result of meter wear and/or component failure. A microprocessor controlled bidirectional prover tube having a calibrated volume is provided in the dispenser housing for operation once during each of a predetermined number of dispensing events. The digital pulses are accumulated during dispensation of the calibrated volume of fluid through the prover, and a calibration factor is automatically calculated and applied to the digital pulses prior to being supplied to an electronic display unit for accurate computation and display of the volume of liquid through the meter. A four-port, two-position valve is actuated prior to the beginning of each dispensing event by the microprocessor to reverse flow through the prover tube.