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:
Jul. 18, 1978
Filed:
Jan. 30, 1976
Applicant:
Inventor:
William J Houk, Columbus, OH (US);
Assignee:
Ranco Incorporated, Columbus, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01H / ;
U.S. Cl.
CPC ...
200 / ; 200 / ; 200 / ; 200 / ; 9210 / ;
Abstract
A pressure responsive control device including a housing, a control switch unit and switch operating actuator, and a controller unit is disclosed for controlling operation of a refrigeration defrosting device. The actuator includes a bladder formed of thin film material which changes volume when a differential fluid pressure exists across the bladder. The bladder and switch unit are such that bladder volume changes are accompanied by minimal losses thus enabling the controller unit to be enabled in response to extremely slight differential pressures.