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:
Jan. 06, 1987
Filed:
Aug. 31, 1984
Frank M Seleno, Haslett, MI (US);
Schmelzer Corporation, Flint, MI (US);
Abstract
A device for selectively modifying the vacuum level provided by a variable vacuum source is described, which generally includes a housing having two inlet ports and an outlet port. The first inlet port provides communication between the housing and the vacuum source. The second inlet provides communication between the housing and the atmosphere. The outlet port provides communication between the housing and a vacuum responsive device. A first valve assembly is contained in the housing for controlling the communication between the first inlet port and a control chamber in the housing, such that the maximum vacuum level reached by the vacuum source beyond a predeterminable vacuum level is maintained in the control chamber. A passageway is formed in the housing for providing communication between the control chamber and the outlet port. A second valve assembly in the housing is responsive to the vacuum level in the control chamber for permitting a predeterminable controlled communication between the second inlet port and the outlet port over a predeterminable vacuum level range.