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:
Dec. 26, 1995
Filed:
Apr. 10, 1995
Tomas Richter, State College, PA (US);
John E Shoff, Osceola Mills, PA (US);
John Skok, Amherst, OH (US);
North American Refractories Co. Inc., Cleveland, OH (US);
Abstract
This invention relates a refractory gas purging device for the introduction of gases through a metallurgical vessel to molten metal therein, the device having improved wear indication, safety, and performance. In particular, the refractory gas purging device has a porous refractory inner wear indicator which indicates the end of the useful life of the device. Further, the refractory gas purging device has directional gas passages which do not extend throughout the entire length of the device to prevent molten metal leaks from the metallurgical vessel and such directional gas passages being designed to improve the performance of the device.