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:
Feb. 15, 1977
Filed:
May. 06, 1975
Berth Ulrik Gustafsson, Osterskar, SW;
Projectus Industriprodukter AB, Stockholm, SW;
Abstract
In an apparatus for defrosting an evaporator in a heat pump which is driven by a compressor, the evaporator consists of a fan and a heat exchanger through which the fan drives air for heat exchange with the heat transport medium flowing through the heat exchanger. A pressure sensitive switch is arranged to actuate a member for reversal of the pumping direction of the compressor when the pressure differential .sigma. p of the air over the heat exchanger has reached a predetermined value, and a temperature sensitive switch which senses the temperature at the heat exchanger, is arranged to actuate the reversal member to maintain the reversed pumping direction of the compressor as long as the temperature at the heat exchanger is less than or equal to 0.degree. C.