US Patent 7578157 Piercing-rolling method and piercing-rolling apparatus for seamless tubes
Patent 7578157 was granted and assigned to Sumitomo Metal Industries on August, 2009 by the United States Patent and Trademark Office.
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Patent Inventor Names
Kazuhiro Shimoda0
Tomio Yamakawa0
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Article (+195 characters)
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Patent abstract
To provide a method and apparatus for seamless tubes in which the occurrence of material peeling can be prevented even when the skew angle δ and tube expansion ratio are increased.
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US Patent 07578157 Piercing-rolling method and piercing-rolling apparatus for seamless tubes US Patent 7578157 Piercing-rolling method and piercing-rolling apparatus for seamless tubes
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Patent Number
075781570
Patent Number
75781570
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Official Website
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Is a
Current Assignee
Patent Jurisdiction
Patent Number
075781570
Date of Patent
August 25, 2009
0Patent Application Number
121556580
Date Filed
June 6, 2008
0Official Website
Patent Primary Examiner
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US Patent 07578157 Piercing-rolling method and piercing-rolling apparatus for seamless tubes
Infobox
Is a
Current assignee
Patent jurisdiction
Patent number
07578157
Date of patent
August 25, 2009
Patent application number
12155658
Date Filed
June 6, 2008
Patent primary examiner
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