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. 30, 1998
Filed:
Jul. 11, 1997
R Douglas Hudgens, Cookeville, TN (US);
Charles L Matheson, Cookeville, TN (US);
Fleetguard, Inc., Nashville, TN (US);
Abstract
A coolant filter for use in filtering a coolant solution which flows through the coolant filter includes a filter housing assembly which is made up of an outer housing which is crimped to a nutplate which defines an internally threaded flow outlet. A generally cylindrical filter element is positioned inside of the filter housing assembly and a first endplate is bonded to the end of the filter element which is adjacent to the nutplate. A second endplate is bonded to the opposite end of the filter element and helps to define an interior space within the filter element. A supply of supplemental coolant additive is contained within an osmotic film enclosure which is positioned within the interior space. The osmotic film enclosure provides a slow release mechanism for controlling the rate of release of the supplemental coolant additive into the coolant solution. In one embodiment of the present invention, the slow release mechanism includes a diffusion tube which defines a diffusion orifice.