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. 06, 1982
Filed:
Mar. 06, 1979
Howard C Nordeen, Glenview, IL (US);
Mark Controls Corporation, Skokie, IL (US);
Abstract
A system for controlling the temperature of an enclosed volume includes a pneumatic thermostat, heating means and cooling means. The thermostat has two entirely independent controls: a heating control and a cooling control. Both controls remain independently operative at all temperatures and each control has an independent set point. Whenever the temperature of the enclosed volume sensed by the thermostat raises above the cooling-control set point, the cooling control generates a first pneumatic signal which activates, adjusts and operates cooling means. Whenever the temperature of the enclosed volume sensed by the thermostat falls below the heating-control set point, the heating control generates a second pneumatic signal which activates, adjusts and operates heating means. The heating-control set point is lower than the cooling-control set point such that there is defined a range of sensed temperatures at which neither heating means nor cooling means is activated, adjusted or operated by the thermostat.