The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 23, 2019
Filed:
Sep. 06, 2016
Applicant:
Daniel C Burns, Cary, NC (US);
Inventor:
Daniel C Burns, Cary, NC (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21D 53/08 (2006.01); B21D 39/06 (2006.01); B23P 15/26 (2006.01);
U.S. Cl.
CPC ...
B21D 53/08 (2013.01); B23P 15/26 (2013.01);
Abstract
A tube-to-tubesheet joint for steam condensers having a plurality of holes drilled in condenser tubesheets, a plurality of 8 mil triangular cut serrations in the wall surface of each hole, locating the serrations in a set positioned centrally of the wall surface, inserting a tube end into each hole, and forming a mechanical interference fit between tube wall and hole wall surface. In modified embodiment for thick tubesheets, plural sets of serrations with sets spaced apart may be formed in tubesheet holes.