Cutlery – Blades – Razor blade
Reexamination Certificate
2006-10-24
2006-10-24
Payer, Hwei-Siu (Department: 3724)
Cutlery
Blades
Razor blade
C030S346570, C030S350000
Reexamination Certificate
active
07124511
ABSTRACT:
A razor blade is provided, which achieves improved safety in use and reduced cutting resistance to an object to be cut such as beard and hair, as compared with conventional razor blades. This razor blade can be obtained by using, as a silicon thin sheet, a single crystal silicon material such as Si wafer or a polycrystalline silicon material including relatively large silicon crystal grains, forming at least one opening in the silicon thin sheet by chemical etching, and forming a cutting edge made of silicon single crystal by ion beam etching without machining such that the cutting edge projects into the opening and has a nose radius of 0.5 μm or less, and preferably 0.1 μm or less.
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Fujimoto Shinji
Hamada Tadashi
Kozai Takashi
Sakon Shigetoshi
Matsushita Electric & Works Ltd.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Payer Hwei-Siu
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