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:
Aug. 31, 1976
Filed:
Aug. 11, 1975
Applicant:
Inventor:
Robert D Shirey, Pittsburgh, PA (US);
Assignee:
Emerson Electric Co., St. Louis, MO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ; H05B / ;
U.S. Cl.
CPC ...
29611 ; 204 33 ; 219316 ; 219335 ; 427123 ; 427328 ; 427405 ; 427436 ;
Abstract
The method of providing a corrosion-resistant coating on the aluminum sheath of an electric immersion heater, comprising the steps of treating the sheath with a nitric acid solution to put a uniform layer of oxide on the exterior sheath surface, then treating the sheath with a caustic tin-bearing solution to strip all oxide from said exterior surface and replace it with a uniform layer of tin, then depositing a uniform layer of bronze over the tin layer, and finally depositing a layer of tin over the bronze coating.