ALEXANDRIA, Va., March 26 -- United States Patent no. 12,259,266, issued on March 25.
"Multi-tank indirect liquid level measurement system and method for holding tanks in a recreational vehicle" was invented by John Vander Horst (Denver).
According to the abstract* released by the U.S. Patent & Trademark Office: "A system and method for measuring liquid levels in a plurality of recreational vehicle holding tanks uses an electric air pump and a selection unit to measure the air pressure required to selectively pump air to the bottom of the holding tanks. The electric air pump is actuated using a user-operated electrical switch and is shut off by a normally-closed pressure switch when the air pressure at the outlet of the electric air pump ...