![]() ![]() ![]() Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US97340A Inventor Henry H Harris Original Assignee Henry H Harris Priority date (The priority date is an assumption and is not a legal conclusion. Google Patents US2115769A - Radiant heating tubeÄownload PDF Info Publication number US2115769A US2115769A US97340A US9734036A US2115769A US 2115769 A US2115769 A US 2115769A US 97340 A US97340 A US 97340A US 9734036 A US9734036 A US 9734036A US 2115769 A US2115769 A US 2115769A Authority US United States Prior art keywords tube gases heating tube corrugations spiral Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. ![]()
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