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:
Oct. 04, 2011
Filed:
Jul. 06, 2007
Frederick R. Hatch, Ann Arbor, MI (US);
Frederick R. Hatch, Ann Arbor, MI (US);
Federal-Mogul World Wide, Inc., Southfield, MI (US);
Abstract
A method of manufacturing a radial shaft seal assembly. The method includes the step of stretching an inner diameter of a ring-shaped polytetrafluoroethylene seal radially outward from an axis with a mandrel to a first stretched condition on a mold core element. The method also includes the step of defining a substantially enclosed mold cavity around the polytetrafluoroethylene seal stretched over the mold core element with at least one mold element. The method also includes the step of locating a rigid casing within the mold cavity spaced from the stretched polytetrafluoroethylene seal. The method also includes the step of introducing a liquefied rubber elastomer into the mold cavity. The method also includes the step of molding the liquefied rubber elastomer under heat and pressure such that the rigid casing and polytetrafluoroethylene seal in a stretched state are bonded to a solid rubber elastomer member. The method also includes the step of removing the collectively bonded polytetrafluoroethylene seal and rigid casing and rubber elastomer member from the mold core element without stretching the inner diameter of the polytetrafluoroethylene seal beyond the first stretched condition.