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. 16, 1977
Filed:
Sep. 08, 1975
Takeji Asai, Toyama, JA;
Kaishu Yamazumi, Toyama, JA;
Kabushiki Kaisha Fujikoshi, Toyama, JA;
Abstract
This invention relates to a method of carbonitriding an iron-containing article. The method comprises the steps of subjecting the article to a carbonitriding atmosphere which atmosphere contains ammonia and an oxygen-containing organic solvent. The ratio of the oxygen atoms to the carbon atoms in the solvent is from about 0.5 to 1.5; and maintaining the article in the carbonitriding atmosphere until at least the surface of the article has increased its carbon and nitrogen content a predetermined amount. Inasmuch as the carbonitriding treatment of the instant invention has a propensity to produce 'HCN' which is well-known noxious gas, as well as NH.sub.3 and CO, it is also within the method of the instant invention to mix the gases used initially to contact the iron-containing article with a fuel gas and remove such a mixture of gases from the furnace where the mixture is subsequently burned thereby decomposing and detoxifying the HCN contained in the exhaust gas.