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Main.WATCH.Ceramics.Zirconia..Co.: CH. S.Patent.Claims Etc.Claim 1: Exterior Part Zirconia.Core: ZrO2. Surface Superficial.Layer Zr Carbide. Claim 2:.WristWatch Part Transition Region.Sub-Stoichiometric Zr Carbides &.Zr OxyCarbides. Claim 6: Mfg. ZrO2.Item with Metallic Appearance:.Place Item in Reaction Vessel;.in which Plasma is generated from.Mixt. of H2; Inert Gas & C Traces &.& Maintain Item in Plasma for Time=.15-240 min.; Temp.=600-1300C to.Convert Portion ZrO2 to Zr Carbide..Claim 7: Argon. Claims 8,9:.Traces of C Select: Methane Etc.Patent Assignee |