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. 11, 1999
Filed:
Jul. 16, 1998
Robert R Fiedler, Lincoln, NE (US);
ISCO Inc., Lincoln, NE (US);
Abstract
A liquid level monitor using a pressure actuated sensor to replace the open bubble tube. Air flows down the supply tube as in the bubbler, but rather than being released into the water, the air enters a chamber that has one movable wall, such as a diaphragm, that is acted on from the inside by pressurized air and from the outside by the hydrostatic head of the water. When the water pressure exceeds the chamber air pressure, the movable wall is pressed against an air outlet and does not allow air in the chamber to escape through the air outlet. One embodiment uses a diaphragm disposed over the air outlet; however, the concept may be extended to several other movable members, such as a piston with low actuation force. When the air chamber pressure exceeds the water pressure, the movable member moves away from the air outlet, releasing air and causing the chamber pressure to drop down to the water pressure.