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:
Mar. 20, 2012
Filed:
Sep. 23, 2008
Loren Veltrop, Chicago, IL (US);
Robert Long, Glenview, IL (US);
Randall Scott Koplin, Fitchburg, WI (US);
Kent J. Kallsen, Jefferson, WI (US);
Douglas S. Rodenkirch, Sun Prairie, WI (US);
Don Van Erden, Wildwood, IL (US);
Loren Veltrop, Chicago, IL (US);
Robert Long, Glenview, IL (US);
Randall Scott Koplin, Fitchburg, WI (US);
Kent J. Kallsen, Jefferson, WI (US);
Douglas S. Rodenkirch, Sun Prairie, WI (US);
Don Van Erden, Wildwood, IL (US);
Prince Castle, LLC, Carol Stream, IL (US);
Abstract
A dispenser for viscous liquids effectuates sequential operations by hydrostatic pressure on an assembly of two pistons separated from each other in a cylinder by a separation spring. When the piston assembly is embedded in material to be dispensed, the space between the pistons fills with material to be dispensed. Pressuring the reservoir by squeezing it or by the addition of pressurized gas, forces the piston assembly down the cylinder at the end of which is an opening from which material in the piston assembly can escape. One of the pistons moves toward the other end by pressure from the reservoir, causing material in the piston assembly to be dispensed. The volume inside the piston assembly defines and limits the volume of material that can be dispensed.