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:
Nov. 27, 1990
Filed:
Aug. 04, 1989
Applicant:
Inventor:
Roy D Mattson, White Bear Lake, MN (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
137-2 ; 137199 ; 55482 ;
Abstract
Two or more relatively fine mesh screens are placed in a liquid flow path to allow gas or air or liquid under pressure to pass through but to prevent unpressurized liquid from flowing through. In one application the device may be attached to a vent opening of a liquid container to permit air into the container while preventing liquid from spilling out of the container through the vent opening. In another application the screens may be used in the flow path for liquid under pressure to prevent dripping of the liquid after the pressure has been removed.