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:
Apr. 18, 2000
Filed:
Jun. 15, 1998
James M Walker, Fond du Lac, WI (US);
Alliance Laundry Systems LLC, Ripon, WI (US);
Abstract
A dry-cleaning apparatus using liquid carbon dioxide (CO.sub.2) as the cleaning fluid has a liquid level detector for providing a continuous reading of the liquid CO.sub.2 level in a storage tank. The liquid level detector includes a first resistance temperature detector disposed in the gas above the liquid, a second resistance temperature detector immersed in the liquid, and a third resistance temperature detector with an elongated sensing section disposed in part in the gas above the liquid and in part in the liquid. Each of the three resistance temperature detectors are heated by a constant current. Voltage signals indicating the respective resistance values of the resistance temperature detectors are measured and processed by a controller to continuously determine and monitor the liquid level in the storage tank.