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:
Mar. 20, 1990
Filed:
Apr. 01, 1988
Robert H Proctor, Rossville, MD (US);
Dennis P Eichenlaub, Kingstown, MD (US);
Murray Corporation, Cockeysville, MD (US);
Abstract
An air conditioner charging station withdraws refrigerant from an air conditioner, reclaims it by removing certain materials, and returns the reclaimed refrigerant to the same air conditioner from which it was withdrawn, and also provides preselected commands upon receipt of signals indicating conditions of temperature, pressure, etc. The reclaimed refrigerant is deposited into a reservoir, which contains a float that cooperates with a level sensor and signal generator to send a signal when the liquid level has reached a predetermined position. This signal causes a valve in the discharge line from the reservoir to close, to prevent discharge of gas from the reservoir. The charging station includes a high pressure conduit and a low pressure conduit which are attached to the air conditioner to be serviced, there being a crossover conduit between them with a solenoid valve in it; the solenoid valve is controlled by a pressure switch sensing pressure on the high pressure side, and the microprocessor, the parts being connected through a relay such that when an excess of pressure occurs, the relay is shifted so as to by-pass the microprocessor to maintain the solenoid valve energized, with the valve thereby being closed.