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:
Sep. 04, 1984
Filed:
Jan. 07, 1982
William R Walters, Cleveland, OH (US);
Other;
Abstract
Apparatus for connection to an outdoor water line carrying water at a selected pressure, for producing a selected low flow rate of water from the water line when the outdoor temperature drops below a selected temperature, which comprises an orifice in the end of the water line of selected small diameter, a closed chamber means having an expansible portion, filled with a selected condensible gas, for which the vapor pressure varies with temperature in a known manner, and closure means positioned adjacent the orifice and means connecting the expansible portion of the chamber to the closure means to shut off the flow of water when the temperature is above a selected value, and to open the orifice to a small trickle flow of water, whenever the temperature outdoors is less than a selected value, such as the freezing point of water.