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:
Jan. 19, 1988
Filed:
Nov. 14, 1985
Daniel L Hertz, Jr, Red Bank, NJ (US);
Seals Eastern Inc., Red Bank, NJ (US);
Abstract
An annular multilayer seal including a series of more than two successive layers of elastomeric material. The layers vary in hardness in the axial direction of the seal, the outermost layers being the hardest and the innermost layer being the softest. Where the seal has at least five layers, the hardness of each layer between the innermost layer and each outermost layer is about the average of the hardnesses of the innermost and outermost layers. The innermost layer may have a trapezoidal cross-sectional shape, the major base of the trapezoid being at the inside surface of the seal. The thickness of the other layers may vary nonlinearly from the inside surface to the outside surface of the seal. The innermost layer has a Shore Durometer A Scale hardness of between 40 and 75, the outermost layer has a Shore Durometer A Scale hardness of between 70 and 95, and where there are at least five layers, each layer between the innermost layer and one of the outermost layers has a Shore Durometer A Scale hardness of between 70 and 90.