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:
May. 14, 1985
Filed:
Jul. 14, 1983
John E Lindberg, Lafayette, CA (US);
Owen, Wickersham & Erickson, San Francisco, CA (US);
Abstract
An inverter apparatus for producing an increasing vacuum effect in response to a decreasing vacuum field. A piston is axially movable within a cylindrical bore. The piston has a first surface exposed to atmospheric pressure. A spring biases the piston in a direction opposed to the direction of movement which would be produced by atmospheric pressure on the second surface. A fluid inlet passageway extends through the cylinder and opens into the cylindrical bore, the piston having an axially extending side wall facing the cylindrical bore. An orifice formed in that side wall and an outlet passageway located at one end of the orifice connect that end with the chamber having the vacuum acting on the first surface of the piston. The axially extending orifice is so located in the side wall of the piston as to provide a decreasing restriction to flow of fluid from the first passageway through the orifice to the outlet with decreasing vacuum.