Razor blade technology
First Claim
1. A process for forming a razor blade comprising the steps ofproviding a substrate,forming a wedge-shaped sharpened edge on said substrate that has an included angle of less than thirty degrees and a tip radius of less than twelve hundred angstroms;
- depositing an interlayer of material selected from the group consisting of silicon, silicon carbide, vanadium, tantalum, niobium, and niobium-molybdenum alloy and alloys of such materials on said sharpened edge; and
depositing a layer of diamond or diamond-like carbon (DLC) material on said interlayer.
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Reexamination
Accused Products
Abstract
A razor blade includes a substrate with a wedge-shaped edge, an interlayer of material selected from the group consisting of silicon, silicon carbide, vanadium, tantalum, nickel, niobium, and niobium-molybdenum alloy and alloys of such materials on the tip and flanks of the wedge-shaped edge, the thickness of the interlayer preferably being in the range of about 50-500 angstroms, and a layer of diamond or diamond-like carbon material on the interlayer that preferably has a thickness of about two thousand angstroms and that defines a tip radius of less than about 1000 angstroms.
157 Citations
24 Claims
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1. A process for forming a razor blade comprising the steps of
providing a substrate, forming a wedge-shaped sharpened edge on said substrate that has an included angle of less than thirty degrees and a tip radius of less than twelve hundred angstroms; depositing an interlayer of material selected from the group consisting of silicon, silicon carbide, vanadium, tantalum, niobium, and niobium-molybdenum alloy and alloys of such materials on said sharpened edge; and
depositing a layer of diamond or diamond-like carbon (DLC) material on said interlayer.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A process for forming a razor blade comprising the steps of providing a substrate, forming on said substrate a wedge-shaped edge that has an included angle of less than 30°
- and a tip radius less than 1,200 angstroms;
depositing an interlayer of material selected from the group consisting of silicon, silicon carbide, vanadium, tantalum, niobium, and niobium-molybdenum alloy and alloys of such materials on said wedge-shaped edge; and
depositing a layer of diamond or diamond-like carbon (DLC) material on said interlayer to provide a radius at the ultimate tip of said diamond or diamond-like carbon material of less than 1,200 angstroms. - View Dependent Claims (10, 11, 12, 13)
- and a tip radius less than 1,200 angstroms;
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14. A razor blade comprising a substrate with a wedge-shaped edge defined by facets that have a width of at least about 0.1 millimeter and an included angle of less than thirty degrees, an interlayer of material selected from the group consisting of silicon, silicon carbide, vanadium, tantalum, niobium, and niobium-molybdenum alloy and alloys of such materials on said wedge-shaped edge;
- and a layer of diamond or diamond-like carbon material on said interlayer.
- View Dependent Claims (15, 16, 17, 18)
- 19. A razor blade comprising a substrate with a wedge-shaped edge, an interlayer of material selected from the group consisting of silicon, silicon carbide, vanadium, tantalum, niobium, and niobium-molybdenum alloy and alloys of such materials on the tip and flanks of said wedge-shaped edge, the thickness of said interlayer being in the range of about 50-500 angstroms, and a layer of diamond or diamond-like carbon material on said interlayer, said layer of diamond or diamond-like carbon material having a thickness of at least about twelve hundred angstroms from the sharpened tip of said substrate to a distance of forty micrometers from the sharpened tip and defining a tip radius of less than about 1000 angstroms.
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22. A shaving unit comprising support structure that defines spaced skin-engaging surfaces, and razor blade structure secured to said support structure, said razor blade structure including a substrate with a wedge-shaped edge, an interlayer of material selected from the group consisting of silicon, silicon carbide, vanadium, tantalum, niobium, and niobium-molybdenum alloy and alloys of such materials on said wedge-shaped edge;
- and a layer of diamond or diamond-like carbon material on said interlayer, said diamond or diamond-like carbon coated wedge-shaped edge being disposed between said skin-engaging surfaces.
- View Dependent Claims (23, 24)
Specification