Original Assignee Prideco Inc Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Wilson Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US08/182,211 Inventor Gerald E. Google Patents Stress relief groove for drill pipeÄownload PDF Info Publication number US5358285A US5358285A US08/182,211 US18221194A US5358285A US 5358285 A US5358285 A US 5358285A US 18221194 A US18221194 A US 18221194A US 5358285 A US5358285 A US 5358285A Authority US United States Prior art keywords drill pipe section groove tube tool joint Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US5358285A - Stress relief groove for drill pipe US5358285A - Stress relief groove for drill pipe
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