Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Steven R. Sullivan0
Date of Patent
May 5, 2009
Patent Application Number
11801046
Date Filed
May 8, 2007
Patent Citations Received
Patent Primary Examiner
Patent abstract
A support ring has an oval upper edge and an oval lower edge. The lower edge is smaller than the upper edge. A tapering oval sidewall is provided between the upper and lower edges. A flange is formed in the support ring. The flange extends outwardly from the upper edge. A groove is provided in the side wall. The groove is provided essentially midway between, and parallel with, the upper and lower edges. A plurality of similarly sized and shaped ramps are formed in the side wall between the groove and the lower edge.
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