Fluid level indicator

• US 3,314,060 A
• Filed: 04/06/1964
• Issued: 04/11/1967
• Est. Priority Date: 04/06/1964
• Status: Expired due to Term

• Current Assignee: Robert P. Mackenzie, William D. Worrell
• Original Assignee: Robert P. Mackenzie, William D. Worrell
• Inventors: Mackenzie, Robert P., Worrell, William D.
• Application Number:
  US04/357,632
• Time in Patent Office: 1,100 Days
• US Class Current: 340/450
• CPC Class Codes: G01F 23/241 for discrete levels
• CPC Class Codes: H01M 10/484 for measuring electrolyte level, electrolyte density or electrolyte conductivity
• CPC Class Codes: H01M 50/569 Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals battery terminal connectors with integrated measuring arrangements G01R31/364
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Claims

1. A FLUID LEVEL INDICATOR COMPRISING:

AN ELECTRICAL POWER SOURCE, ELECTRICAL INDICATING MEANS CONNECTED BETWEEN SAID POWER SOURCE AND GROUND, A FLUID CONTAINER CONDUCTIVELY ENGAGING SAID POWER SOURCE AND GROUND, AND CURRENT RESPONSIVE MEANS ADAPTED TO SHORT OUT THE INDICATING MEANS WHEN CURRENT FLOWS THROUGH A FLUID IN THE FLUID CONTAINER INTO SAID CURRENT RESPONSIVE MEANS, SAID CURRENT RESPONSIVE MEANS IS A TRANSISTOR THAT IS NORMALLY CONDUCTING, SAID TRANSISTOR BECOMING NON-CONDUCTIVE WHEN THE FLUID LEVEL RECEDES BELOW A PREDETERMINED DESIRED LEVEL.