Liquid level indication system

• US 3,184,969 A
• Filed: 06/10/1963
• Issued: 05/25/1965
• Est. Priority Date: 06/10/1963
• Status: Expired due to Term

• Current Assignee: Norman A. Bolton
• Original Assignee: Norman A. Bolton
• Inventors: Bolton, Norman A.
• Application Number:
  US04/286,596
• Time in Patent Office: 715 Days
• US Class Current: 73/290.00V
• CPC Class Codes: G01F 23/2962 Measuring transit time of reflected waves
• CPC Class Codes: G01S 15/14 wherein a voltage or current pulse is initiated and terminated in accordance respectively with the pulse transmission and echo reception
• CPC Class Codes: G01S 7/52004 Means for monitoring or calibrating short-range imaging G01S7/5205
• CPC Class Codes: Y10S 367/902 Speed of sound compensation
• CPC Class Codes: Y10S 367/908 Material level detection, e.g. liquid level

Claims

1. A LIQUID LEVEL-INDICATION SYSTEM FOR INDICATING CONTINUOUSLY THE LEVEL OF LIQUID IN A TANK COMPRISING, MEANS FOR PRODUCING A SUCCESSION OF ENERGY PULSES, MEANS FOR DETECTING PARTS OF THE ENERGY PULSES REFLECTED FROM BOTH THE LIQUID SURFACE SPACED FROM THE PRODUCING MEANS AND A FIXED REFLECTIVE SURFACE POSITIONED THEREBETWEEN, SIGNAL PRODUCING MEANS COUPLED TO THE PULSE PRODUCING AND PULSE PROTECTING MEANS FOR PRODUCING A FIRST SIGNAL IN RESPONSE TO THE ELASPED TIME BETWEEN PRODUCTION OF ANY ENERGY PULSE AND THE DETECTION OF A PORTION THEREOF REFLECTED FROM SAID FIXED REFLECTIVE SURFACE AND A SECOND SIGNAL IN RESPONSE TO THE ELASPED TIME BETWEEN THE PRODUCTION OF SAID ENERGY PULSE AND THE DETECTION OF A PORTION THEREOF REFLECTED FROM THE LIQUID SURFACE, CIRCUIT MEANS RESPONSIVE TO SAID SIGNAL PRODUCING MEANS FOR PROVIDING AN OUTPUT SIGNAL CORRESPONDING TO SAID FIRST SIGNAL MODIFIED BY SAID SECOND SIGNAL, AND LIQUID LEVEL INDICATION MEANS RESPONSIVE TO SAID CIRCUIT MEANS FOR INDICATING THE LEVEL OF LIQUID IN SAID TANK.