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:
Jun. 28, 1977
Filed:
Apr. 21, 1976
Bruce M Sullivan, Burnsville, MN (US);
Donaldson Company, Inc., Minneapolis, MN (US);
Abstract
An improved arrangement for responding to reversal in the sense of the ratio between two pressures. In a housing there is located a generally cup-shaped indicator element of resilient, air impermeable material including a slack diaphragm having a central area of augmented visibility and an integral tongue projecting obliquely therefrom. The diaphragm is self-biased in either of two positions, in one of which the tongue conceals the central area, and in the other of which the tongue exposes the area. Pressures to be compared are applied on opposite sides of the diaphragm, and an observation window is provided.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile