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US 4,252,837 AGranted
Blade shields
AssigneeWarner-Lambert Company
InventorJohn P. Auton
Life of this patent
Estimating the term…
Abstract
A razor blade having vacuum deposited structural elements guarding its cutting edge. A plurality of ion plated structural elements are deposited over the blade edge and extending down the edge facets a certain distance. The spacing and extension of the elements beyond the edge are controlled during the deposition process in order to provide desirable shaving characteristics. The blade edge and guard are covered with an adherent film of polytetrafluoroethylene.
Claims10
A method for forming a guard over a razor blade edge comprising the steps of:
- placing the blade in a vacuum chamber,
- masking the blade edge in a predetermined pattern,
- establishing a vacuum,
- introducing an inert gas into the chamber after establishing said vacuum,
- applying an electrical potential between an anode and a cathode in the chamber sufficient to create a plasma, and
- interacting said plasma with a material in the chamber so that the material is deposited on the blade edge in accordance with the masking pattern.
3 more elements
Dependencies are inferred from the claim text.