The Gillette Company

Kevin P McDonough

Donald R Chaulk

Manohar S Grewal

James W Walsh

Mark D Lincoln

John A Hindley

John F Krantz

William J Felton

Theodore J Campo

Neville Sonnenberg

Hoang Mai Trankiem

Andrew Vladimirovich Zhuk

Charles Samuel White

Colin Clipstone

Steve Syng-Hi Hahn

Michael J Paretchan

A razor blade including a substrate with a cutting edge defined by a sharpened tip and adjacent facets, a layer of hard coating on the cutting edge, an overcoat layer of a chromium containing material on the layer of hard carbon coating, and an outer layer of polytetrafluoroethylene coating over the overcoat layer. Also disclosed is a method of making a razor blade including providing a substrate with a cutting edge defined by a sharpened tip and adjacent facets, and applying an aqueous solution including polytetrafluoroethylene coating over the sharpened tip to result in an outer layer, the polytetrafluoroethylene having a molecular weight of about 45,000.

Razor blade technology

A machine for removing oil, dirt and grinding debris from a metal surface comprises a plurality of wash, rinse and dry stations separated to prevent contamination carryover from one station to the next. Razor blades in stacks are passed through the stations, the stacked blades being mounted on rods supported by a fixture and the nozzles or jets within the machine being so oriented as to cause a riffling of the blades due to water or air pressure. A purified water rinse and preferably an aqueous cleaning solution are employed in the machine and are circulated through the stations by a flow system which provides efficient and economical usage of the cleaning solution and rinse materials.

Aqueous cleaning of blade stack

A method of manufacturing a razor blade includes steps for removing oil, dirt and grinding debris from a metal surface by providing a plurality of wash, rinse and dry stations separated to prevent contamination carryover from one station to the next. Razor blades in stacks are passed through the stations, the stacked blades being mounted on rods supported by a fixture and the nozzles or jets within the machine being so oriented as to cause a riffling of the blades due to water or air pressure. A purified water rinse and preferably an aqueous cleaning solution are employed in the method and are circulated through the stations by a flow system which provides efficient and economical usage of the cleaning solution and rinse materials.

Aqueous cleaning method

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West Roxbury, MA, United States of America

Kevin P McDonough