US 11,230,025 B2Granted

Razor blade

AssigneeThe Gillette Company

InventorsKenneth James Skrobis, Ming Laura Xu, Yongqing Ju, Bin Shen, Matthew Robert Stone

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Abstract

A razor blade having a substrate with a cutting edge being defined by a sharpened tip is provided where the substrate is comprised of a molybdenum (Mo) content of about 1.6% to about 5% by weight of composition and thicknesses of 1.60-1.75 μm and 9.25-10.00 μm measured at a distance of 4 and 40 μm from the blade tip, respectively. This thickness ratio is between 0.165-0.185. The substrate thickness is about 2.70-3.00 μm at 8 μm from the blade tip, about 4.44-5.00 μm at 16 μm from the blade tip with a thickness ratio measured at 4 μm and 8 μm between 0.56-0.62, and a thickness ratio measured at 4 μm and 16 μm between 0.32-0.40. The edge shape may be defined by equation w=adn with “a” between 0.50-0.62 and “n” between 0.76-0.80. A semi-included angle less than 7° is measured at a distance of 40 μm or greater from the blade tip. This substrate will have substantially no cracks.

Claims25

Dependent claims

A razor blade comprising:

a substrate comprising 1% to 5% Mo, by weight of composition, with a cutting edge being defined by a sharpened tip, said substrate having a thickness of between 1.60 and 1.75 micrometers measured at a distance of four micrometers from the blade tip, and a thickness of between 9.25 and 10.00 micrometers measured at a distance of forty micrometers from the blade tip, said substrate further comprising a body, a first pair of facets, and a second pair of facets, wherein the second pair of facets diverge from the blade tip to a distance of 12 to 50 micrometers and the first pair of facets extend between the body and the second pair of facets such that each facet of the second pair of facets intersects with a corresponding facet of the first pair of facets, the first pair of facets defining a semi-included angle that is less than 7 degrees when measured at a distance of forty micrometers or greater from the blade tip, wherein the semi-included angle is defined by (i) half of an included angle formed between extended lines of the first pair of facets, or (ii) an intersection of an extended line of the body and one of the facets of the first pair of facets.

Dependencies are inferred from the claim text.