US Patent 7628232 Rotary-percussion drill with a four-start helical shaft
Patent 7628232 was granted and assigned to Hilti on December, 2009 by the United States Patent and Trademark Office.
Is a
Current Assignee
Date Filed
April 27, 2007
Date of Patent
December 8, 2009
Patent Application Number
11796737
Patent Jurisdiction
Patent Number
Patent Primary Examiner
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