Razor blade technology

US6866894B2 · kind B2 · utility

Assignee

• The Gillette Company LLC · US

Inventors

• Hoang Mai Trankiem · Watertown, US
• Michael J. Paretchan · Weymouth, US
• Colin Clipstone · Weston, US
• Steve S. Hahn · Wellesley, US
• Neville Sonnenberg · Newton, US
• Charles S. White · Princeton, US
• Andrew Zhuk · Acton, US
• Kevin P. McDonough · Dedham, US

Key dates

• Filing date: Jul 10, 2002
• Grant date: Mar 15, 2005
• Expiry date: Nov 22, 2022

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B26B21/60
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

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.