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.
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Patent abstract
A rotary-percussion drill includes a four-start helical shaft (3) having a fourfold rotationally and mirror-symmetrical helix cross-section, with radially projecting convexly formed helical webs (4) extending from a concave groove bottom (5) up to the envelope circle (6) and having an undercut (7) with respect to a web width (S).
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US Patent 07628232 Rotary-percussion drill with a four-start helical shaft US Patent 7628232 Rotary-percussion drill with a four-start helical shaft
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Patent Number
0762823200
Patent Number
762823200
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Official Website
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Infobox
Is a
Current Assignee
Patent Jurisdiction
Patent Number
076282320
Date of Patent
December 8, 2009
0Patent Application Number
117967370
Date Filed
April 27, 2007
0Official Website
Patent Primary Examiner
Edits on 26 Sep, 2022
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Infobox
Is a
Current Assignee
Patent Jurisdiction
Patent Number
076282320
Date of Patent
December 8, 2009
0Patent Application Number
117967370
Date Filed
April 27, 2007
0Official Website
Patent Primary Examiner
Edits on 18 Jun, 2022
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US Patent 07628232 Rotary-percussion drill with a four-start helical shaft
Infobox
Is a
Current assignee
Patent jurisdiction
Patent number
07628232
Date of patent
December 8, 2009
Patent application number
11796737
Date Filed
April 27, 2007
Patent primary examiner
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