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US Patent 7118634 Low-pressure cementation method

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Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7118634
Date of Patent
October 10, 2006
Patent Application Number
10258410
Date Filed
February 22, 2002
Patent Primary Examiner
Roy King
Roy King
Patent abstract

The invention relates to a low-pressure carburising method comprising alternating low-pressure enrichment steps and diffusion steps in the presence of a neutral gas. During the enrichment steps, an enriching gas and neutral gas mixture is used, the proportion of the neutral gas being between 5 and 50% by volume of the enriching gas. The enriching gas can be, for example, acetylene (C2H2).

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