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:
Jul. 12, 1976
Thomas Lee Tucker, West Palm Beach, FL (US);
Gilbert Halverson, West Palm Beach, FL (US);
Scientific Instruments, Inc., Lake Worth, FL (US);
Abstract
A system for determining remotely the distance from the bottom of a storage tank to the liquid-vapor interface of the stored liquid utilizing a pair of solid state electrical sensing elements whose electrical resistance varies as a function of element heat dissipation capable of providing continuous extremely accurate digitally displayed measurement information referenced to the bottom of the tank even when the stored liquid and vapor are at the same temperature. The solid-state electrical interface sensing elements are affixed at the end of a vertically suspended motor driven cable disposed within the storage tank which is coupled to a DC pulse activated stepping motor and a master control circuit connecting the signal output of the sensing elements to the motor. The motor and cable system in conjunction with the control circuitry provide and drive the motor in stepping increments for continuously determining the liquid-vapor interface as referenced to the bottom of the storage tank. A remote digital display showing the quantitative values of the liquid-vapor interface level is provided. Scaling logic circuitry correlates the digital pulse counting technique in conjunction with a step-by-step movement of the probe assembly through the DC stepping motor.