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:
Jun. 28, 1977
Filed:
Feb. 02, 1976
Chester F Jatczak, North Canton, OH (US);
Richard W Brown, North Canton, OH (US);
The Timken Company, Canton, OH (US);
Abstract
A method for bringing a quenching medium into contact with both the inner and outer wall surfaces of metallic tubing, characterized in that a quenching liquid is fed into the interior of the tubing and pressurized, followed by quenching of the outer wall surface, preferably by immersion in a tank containing a quenching liquid. Pressurization of the quenching liquid fed into the interior of the tubing insures uniform wall contact of the liquid around the inner wall surface and along the entire length of the tubing. This brings about uniform hardness characteristics throughout the thickness of the tube walls and along its entire length and eliminates or reduces quench-crack problems inherent in prior art quenching systems wherein the quenching medium within the tubing is not pressurized.