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US 2010/0299931 A1Published application
Strengthened razor blade
AssigneeThe Gillette Company
InventorsKrassimir Grigorov Marchev, John Madeira
Life of this patent
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Abstract
A razor blade including a substrate with a cutting edge, the substrate includes a mixed nitride-substrate interregion disposed at or beneath a surface of the substrate, the mixed nitride-substrate interregion being substantially free of a compound layer.
Claims20
A razor blade comprising a substrate with a cutting edge, the substrate comprising a mixed nitride-substrate interregion disposed at or beneath a surface of the substrate, the mixed nitride-substrate interregion being substantially free of a compound layer.
A method for strengthening a razor blade comprising the steps of:
- a. providing a substrate comprising a cutting edge in a vacuum chamber;
- b. supplying into the vacuum chamber a nitrogen-containing gas mixture comprising between about 1-12% by volume of nitrogen and between about 88-99% by volume of hydrogen;
- and
- c. nitriding the substrate with the nitrogen-containing gas mixture to form a mixed nitride-substrate interregion disposed at or beneath a surface of the substrate.
1 more element
Dependencies are inferred from the claim text.