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:
Jan. 16, 1979
Filed:
Dec. 23, 1977
Applicant:
Inventors:
William W Kastilahn, Rockford, IL (US);
Robert R Garrett, Rockford, IL (US);
Vernon L Park, Rockford, IL (US);
Assignee:
Alco Standard Corporation, Valley Forge, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
H05B / ; F27D / ;
U.S. Cl.
CPC ...
13 25 ; 338234 ;
Abstract
Graphite heating rods are disposed within a radiant tube which contains nitrogen under pressure to prevent oxidation of the rods. The pressure in the tube is sensed and nitrogen is admitted into or exhausted from the tube depending upon whether the pressure drops below or rises above a safe range. Only as much nitrogen is introduced into the tube as is necessary to replenish that which might be lost through normal leakage and thus only a comparatively small quantity of nitrogen is required to protect the graphite rods.