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:
Aug. 01, 1989
Filed:
Dec. 07, 1987
James F Ennis, III, Preston, CT (US);
Genesis Industries, Incorporated, Spring Valley, WI (US);
Abstract
This dispenser for a viscous fluid comprises a cylindrical barrel having a nozzle at one end thereof for passing a fluid to fill the barrel and to discharge the fluid from the barrel. A flexible cylindrical piston head fits frictionally in the barrel to seal the fluid therein. The piston head is moved axially to discharge the fluid from the barrel. A multiplicity of short passages are defined by ridges or formed by narrow grooves on or in the inside wall of the barrel near the nozzle. The passages are only slightly longer than the axial length of the piston head to pass air entrapped between the piston head and fluid, axially of the barrel passed the piston head. The fluid fills the barrel and abuts the piston head, so that no air bubbles are discharged with the fluid from the nozzle. The hardness of the piston head is such that the sides of the head do not enter the passages which remain unobstructed. When the piston head is moved beyond the passages, the barrel is sealed by the flexible piston head and the fluid cannot leak passed the head even when heavy pressure is applied to the piston head to discharge the fluid from the barrel.