EP0591339B1 - Razor blade and process for forming a razor blade - Google Patents

Razor blade and process for forming a razor blade Download PDF

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Publication number
EP0591339B1
EP0591339B1 EP92913506A EP92913506A EP0591339B1 EP 0591339 B1 EP0591339 B1 EP 0591339B1 EP 92913506 A EP92913506 A EP 92913506A EP 92913506 A EP92913506 A EP 92913506A EP 0591339 B1 EP0591339 B1 EP 0591339B1
Authority
EP
European Patent Office
Prior art keywords
diamond
tip
layer
sharpened
substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92913506A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0591339A1 (en
EP0591339A4 (tr
Inventor
C. Robert Parent
John Madeira
Steve Syng-Hi Hahn
Chong-Ping Peter Chou
Lamar Eugene Brooks
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gillette Co LLC
Original Assignee
Gillette Co LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US07/719,793 external-priority patent/US5232568A/en
Application filed by Gillette Co LLC filed Critical Gillette Co LLC
Publication of EP0591339A1 publication Critical patent/EP0591339A1/en
Publication of EP0591339A4 publication Critical patent/EP0591339A4/en
Application granted granted Critical
Publication of EP0591339B1 publication Critical patent/EP0591339B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
    • B26B21/54—Razor-blades
    • B26B21/58—Razor-blades characterised by the material
    • B26B21/60—Razor-blades characterised by the material by the coating material

Definitions

  • a razor blade typically is formed of a suitable substrate material such as metal or ceramic and an edge is formed with wedge-shape configuration with an ultimate edge or tip that has a radius of less than about 1,000 angstroms.
  • a razor blade is held in the razor at an angle of approximately 25°, and with the wedge-shaped edge in contact with the skin, it is moved over the face so that when the edge encounters a beard hair, it enters and severs it by progressive penetration, aided by a wedging action.
  • the cut portion of the hair (which on average is about 100 micrometers in diameter) remains pressed in contact with the blade facets remote from the facial skin surface for a penetration up to only about half the hair diameter. Beyond this, the hair can bend and contract away from the blade to relieve the wedging forces.
  • the resistance to penetration through reaction between hair and blade facets therefore occurs only over about the first sixty micrometers of the blade tip back from the edge and the geometry of the blade tip in this region is regarded as being the most important from the cutting point of view.
  • U.S. Patent No. 4,720,918 discloses a razor blade having a steel substrate that has been mechanically abraded to form a wedge-shaped sharpened edge having desirable cutting dimensions.
  • U.S. Patent No. 3,761,372 discloses a process for depositing a strengthening layer of metal or alloy material such as chromium or chrome-platinum upon a sharpened edge of a razor blade.
  • Diamond and diamond-like carbon (DLC) materials may be characterized as having substantial sp 3 carbon bonding; a mass density greater than 1.5 grams/cm 3 ; and a Raman peak at about 1331 cm -1 (diamond) or about 1550 cm -1 (DLC).
  • Each such layer or layers of supplemental material desirably provides characteristics such as improve shavability, improved hardness, edge strength and/or corrosion resistance whole not adversely affecting the geometry and cutting effectiveness of the shaving edge.
  • German Patent DE 3,047,888 discloses a coated steel substrate having an interlayer of material.
  • a process for forming a razor blade including mechanically abrading a substrate to form a wedge-shaped sharpened edge thereon having a tip with a radius of less than twelve hundred angstroms, and forming a layer of diamond or diamond-like carbon material on said sharpened edge of said substrate by positioning said substrate and a solid target member in a chamber, and sputtering said solid target member to generate carbon atoms for forming said layer of diamond or diamond-like carbon material on said sharpened edge of said substrate from said carbon atoms while applying an RF bias to said substrate, said layer of diamond or diamond-like carbon material forming an ultimate tip having an aspect ratio of 1:1 - 3:1, said wedge-shaped sharpened edge being formed with a sharpened tip having an included angle of less than 17° at a distance of 40 ⁇ m (micrometers) from a tip of said sharpened edge, said layer of diamond or diamond-like carbon material having a thickness of at least 1200 ⁇ (angstroms) from the sharpened tip
  • a razor blade including a substrate having a wedge-shaped sharpened edge formed thereon, said wedge-shaped sharpened edge including a sharpened tip and a layer of diamond or diamond-like carbon material formed on said sharpened edge of said substrate, said layer of diamond or diamond-like carbon material having a thickness of at least twelve hundred angstroms from the sharpened tip to a distance of forty micrometers from the sharpened tip, said layer of diamond or diamond-like carbon material includes an ultimate tip having an aspect ratio ranging from about 1:1-3:1, said sharpened tip having an included angle of less than seventeen degrees at a distance of forty micrometers from the sharpened tip, characterized in that said sharpened tip has an L5 wet wool felt cutter force of less than 0.8 kilogram, dry wool felt (ten cuts) edge damage of less than fifty small edge damage regions and no damage regions of larger dimension or depth, and a radius at the ultimate tip of less than 400 ⁇ (angstroms), said ultimate tip being defined by facets having a length of at least about 0.1
  • the process may include the step of depositing a layer of material on the wedge-shaped sharpened edge to a thickness of about 300 ⁇ (angstroms) or less prior to depositing the layer of diamond or diamond-like carbon material.
  • the process may include the step of depositing an adherent polymer coating on the layer of diamond or diamond-like carbon material.
  • the shaving unit may be of the disposable cartridge type adapted for coupling to and uncoupling from a razor handle or may be integral with a handle so that the complete razor is discarded as a unit when the blade or blades become dull.
  • the front and rear skin-engaging surfaces cooperate with the blade edge (or edges) to define the shaving geometry.
  • Particularly preferred shaving units are of the types shown in U.S. Patent 4,586,255.
  • shaving unit 10 includes structure for attachment to a razor handle, and a platform member 12 molded of high-impact polystyrene that includes structure defining forward, transversely-extending skin engaging surface 14. Mounted on platform member 12 are leading blade 16 having sharpened edge 18 and following blade 20 having sharpened edge 22.
  • Cap member 24 of molded high-impact polystyrene has structure defining skin-engaging surface 26 that is disposed rearwardly of blade edge 22, and affixed to cap member 24 is shaving aid composite 28.
  • FIG. 3 A diagrammatic view of the edge region of the blades 16, 20 and 44 is shown in Fig. 3.
  • the blade includes stainless steel body portion 50 with a wedge-shaped sharpened edge formed in a sequence of edge forming honing operations that forms a tip portion 52 that has a radius typically less than 500 angstroms with facets 54 and 56 that diverge at an angle of about 13°.
  • Deposited on tip 52 and facets 54, 56 is interlayer 58 of molybdenum that has a thickness of about 300 angstroms.
  • outer layer 60 of diamond-like carbon (DLC) that has a thickness of about 2,000 angstroms, with facets 62, 64 that have lengths of about one-quarter micrometer each and define an included angle of about 80°, facets 62, 64 merging with main facet surfaces 66, 68 that are disposed at an included angle of about 13° and an aspect ratio (the ratio of the distance (a) from DLC tip 70 to stainless steel tip 52 and the width (b) of the DLC coating 60 at tip 52) of about 1.7.
  • DLC diamond-like carbon
  • facets 62, 64 that have lengths of about one-quarter micrometer each and define an included angle of about 80°
  • main facet surfaces 66, 68 that are disposed at an included angle of about 13° and an aspect ratio (the ratio of the distance (a) from DLC tip 70 to stainless steel tip 52 and the width (b) of the DLC coating 60 at tip 52) of about 1.7.
  • an adherent telomer layer 72 that has a substantial as deposited thickness
  • FIG. 4 Apparatus for processing blades of the type shown in Fig. 3 is diagrammatically illustrated in Fig. 4.
  • That apparatus includes a DC planar magnetron sputtering system manufactured by Vac Tec Systems of Boulder, Colorado that has stainless steel chamber 74 with wall structure 80, door 82 and base structure 84 in which is formed port 86 coupled to a suitable vacuum system (not shown).
  • a suitable vacuum system (not shown).
  • mounted in chamber 74 is carousel support 88 with upstanding support member 90 on which is disposed a stack of razor blades 92 with their sharpened edges 94 in alignment and facing outwardly from support 90.
  • Targets 96 and 98 are vertically disposed plates, each about twelve centimeters wide and about thirty-seven centimeters long.
  • Support structures 76, 78 and 88 are electrically isolated from chamber 74 and electrical connections are provided to connect blade stack 92 to RF power supply 100 through switch 102 and to DC power supply 104 through switch 106; and targets 96 and 98 are connected through switches 108, 110, respectively, to DC magnetron power supply 112.
  • Shutter structures 114 and 116 are disposed adjacent targets 96, 98, respectively, for movement between an open position and a position obscuring its adjacent target.
  • Carousel 88 supports the blade stack 92 with the blade edges 94 spaced about seven centimeters from the opposed target plate 96, 98 and is rotatable about a vertical axis between a first position in which blade stack 92 is in opposed alignment with molybdenum target 96 (Fig. 4) and a second position in which blade stack 92 is in opposed alignment with graphite target 98.
  • a stack of blades 92 (thirty centimeters high) is secured on support 90 (together with three polished stainless steel blade bodies disposed parallel to the target); chamber 74 is evacuated; the targets 96, 98 are cleaned by DC sputtering for five minutes; switch 102 is then closed and the blades 92 are RF cleaned in an argon environment for three minutes at a pressure of ten millitorr, an argon flow of 200 sccm and a power of 1.5 kilowatts; the argon flow is then reduced to 150 sccm at a pressure of 4.5 millitorr in chamber 74; switch 106 is closed to apply a DC bias of -50 volts on blades 92; switch 108 is closed to sputter target 96 at one kilowatt power; and shutter 114 in front of molybdenum target 96 is opened; for twenty-eight seconds to deposit a molybdenum layer 58 of about 300 angstroms
  • Shutter 114 is then closed, switches 106 and 108 are opened, and carousel 88 is rotated 90° to juxtapose blade stack 92 with graphite target 98.
  • Pressure in chamber 74 is reduced to two millitorr with an argon flow of 150 sccm; switch 110 is closed to sputter graphite target 98 at 500 watts; switch 102 is closed to apply a 13.56 MHz RF bias of one thousand watts (-440 volts DC self bias voltage) on blades 92, and concurrently shutter 116 is opened for twenty minutes to deposit a DLC layer 60 of about two thousand angstroms thickness on molybdenum layer 58.
  • the DLC coating 60 had a radius at tip 70 of about 250 Angstroms that is defined by facets 62, 64 that have an included angle of about 80°, an aspect ratio of about 1.7:1, and a hardness (as measured on the planar surface of an adjacent stainless steel blade body with a Nanoindenter X instrument to a depth of five hundred angstroms) of about seventeen gigapascals (the stainless steel blade body having a hardness of about eight gigapascals).
  • Raman spectroscopy of the coating material 60 deposited in this process shows a broad Raman peak 120 at about 1400-1500 cm -1 wave number, a spectrum typical of DLC structure.
  • Coatings 58 and 60 were firmly adherent to the blade body 50 and provided low wet wool felt cutter force (the lowest of the first five cuts with wet wool felt (L5) being about 0.45 kilogram), and withstood repeated applications of wet wool felt cutter forces (the lowest cutter force of the 496-500 cuts being about 0.65 kilogram), indicating that the DLC coating 60 is substantially unaffected by exposure to the severe conditions of this felt cutter test and remains firmly adhered to the blade body 50.
  • Edge damage and delamination after ten cuts with dry wool felt as determined by microscopic assessment was substantially less than commercial chrome-platinum coated blades, there being less than four small edge damage regions (each such small damage region being of less than twenty micrometer dimension and less than ten micrometer depth) and no damage regions of larger dimension or depth.
  • Resulting blade elements 44 were assembled in cartridge units 30 of the type shown in Fig. 2 and shaved with excellent shaving results.
  • a stack of blades 92 (thirty centimeters high) is secured on support 90 (together with three polished stainless steel blade bodies disposed parallel to the target); chamber 74 is evacuated; the targets 96, 98 are cleaned by DC sputtering for five minutes; switch 102 is then closed and the blades 92 are RF cleaned in an argon environment for two and a quarter minutes at a pressure of ten millitorr, an argon flow of 200 sccm and a power of 1.5 kilowatts; the argon flow is then reduced to 150 sccm at a pressure of six millitorr in chamber 74; switch 106 is closed to apply a DC bias of -50 volts on blades 92; shutter 114 in front of molybdenum target 96 is opened; and switch 108 is closed to sputter target 96 at one kilowatt power for thirty-two seconds to deposit a molybdenum layer 58 of about 300 angstroms
  • Shutter 114 is then closed, switches 106 and 108 are opened, and carousel 88 is rotated 90° to juxtapose blade stack 92 with graphite target 98.
  • Pressure in chamber 74 is reduced to two millitorr with an argon flow of 150 sccm; switch 110 is closed to sputter graphite target 98 at 500 watts; switch 102 is closed to apply a 13.56 MHz RF bias of 320 watts (-220 volts DC self bias voltage) on blades 92, and concurrently shutter 116 is opened for seven minutes to deposit a DLC layer 60 of about 900 angstroms thickness on molybdenum layer 58.
  • the DLC coating 60 had a tip radius of about 300 Angstroms, an aspect ratio of 1.6:1, and a hardness (as measured on the planar surface of an adjacent stainless steel blade body as measured with a Nanoindenter X instrument) of about thirteen gigapascals.
  • a coating 72 of polytetrafluoroethylene telomer is then applied to the DLC-coated edges of the blades in accordance with the teaching of U.S. Patent No. 3,518,110.
  • the process involved heating the blades in a neutral atmosphere of argon and providing on the cutting edges of the blades an adherent and friction-reducing polymer coating of solid PTFE.
  • Coatings 58 and 60 were firmly adherent to the blade body 50, provided low wet wool felt cutter force (the lowest of the first five cuts with wet wool felt (L5) being about 0.6 kilogram), and withstood repeated applications of wet wool felt cutter forces (the lowest cutter force of the 496-500 cuts being about 0.76 kilogram), indicating that the DLC coating 60 is substantially unaffected by exposure to the severe conditions of this felt cutter test and remains firmly adhered to the blade body 50.
  • low wet wool felt cutter force the lowest of the first five cuts with wet wool felt (L5) being about 0.6 kilogram
  • wet wool felt cutter forces the lowest cutter force of the 496-500 cuts being about 0.76 kilogram
  • Edge damage and delamination after ten cuts with dry wool felt as determined by microscopic assessment was substantially less than commercial chrome-platinum coated blades, there being less than four small edge damage regions (each such small damage region being of less than twenty micrometer dimension and less than ten micrometer depth) and no damage regions of larger dimension or depth.
  • Resulting blade elements 44 were assembled in cartridge units 30 of the type shown in Fig. 2 and shaved with excellent shaving results.
  • Shutter 114 is then closed, switches 106 and 108 are opened, and carousel 88 is rotated 90° to juxtapose blade stack 92 with graphite target 98.
  • Pressure in chamber 74 is reduced to two millitorr with an argon flow of 150 sccm; switch 110 is closed to sputter graphite target 98 at 500 watts; switch 102 is closed to apply a 13.56 MHz RF bias of 320 watts (-220 volts DC self bias voltage) on blades 92, and concurrently shutter 116 is opened for five minutes to deposit a DLC layer 60 of about 600 angstroms thickness on molybdenum layer 58.
  • the DLC coating 60 had a tip radius of about 400 Angstroms, an aspect ratio of 1.7:1, and a hardness (as measured on the planar surface of an adjacent stainless steel blade body as measured with a Nanoindenter X instrument) of about thirteen gigapascals.
  • Raman spectroscopy of the coating material 60 deposited in this process shows a broad Raman peak 122 at about 1543 cm -1 wave number, a spectrum typical of DLC structure.
  • a telomer coating 72 was applied to the blade edges with a nitrogen atmosphere.
  • the resulting coatings 58 and 60 were firmly adherent to the blade body 50, provided low wet wool felt cutter force (the lowest of the first five cuts with wet wool felt (L5) being about 0.6 kilogram), and withstood repeated applications of wet wool felt cutter forces (the lowest cutter force of the 496-500 cuts being about 0.76 kilogram), indicating that the DLC coating 60 is substantially unaffected by exposure to the severe conditions of this felt cutter test and remains firmly adhered to the blade body 50.
  • Edge damage and delamination after ten cuts with dry wool felt as determined by microscopic assessment was substantially less than commercial chrome-platinum coated blades, there being less than five small edge damage regions (each such small damage region being of less than twenty micrometer dimension and less than ten micrometer depth) and no damage regions of larger dimension or depth.
  • Resulting blade elements 44 were assembled in cartridge units 30 of the type shown in Fig. 2 and shaved with excellent shaving results.

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  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physical Vapour Deposition (AREA)
  • Dry Shavers And Clippers (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Knives (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Cosmetics (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
EP92913506A 1991-06-24 1992-06-11 Razor blade and process for forming a razor blade Expired - Lifetime EP0591339B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US07/719,793 US5232568A (en) 1991-06-24 1991-06-24 Razor technology
US719793 1991-06-24
US79242791A 1991-11-15 1991-11-15
US792427 1991-11-15
PCT/US1992/004932 WO1993000204A1 (en) 1991-06-24 1992-06-11 Improvements in or relating to razor blades

Publications (3)

Publication Number Publication Date
EP0591339A1 EP0591339A1 (en) 1994-04-13
EP0591339A4 EP0591339A4 (tr) 1994-08-31
EP0591339B1 true EP0591339B1 (en) 1998-08-12

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ID=27110143

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Application Number Title Priority Date Filing Date
EP92913506A Expired - Lifetime EP0591339B1 (en) 1991-06-24 1992-06-11 Razor blade and process for forming a razor blade

Country Status (19)

Country Link
EP (1) EP0591339B1 (tr)
JP (1) JP3722829B2 (tr)
KR (1) KR100245979B1 (tr)
CN (1) CN1039793C (tr)
AT (1) ATE169547T1 (tr)
AU (1) AU667816B2 (tr)
CA (1) CA2111343C (tr)
CZ (1) CZ286598B6 (tr)
DE (1) DE69226640T2 (tr)
DK (1) DK0591339T3 (tr)
EG (1) EG19616A (tr)
ES (1) ES2118821T3 (tr)
MA (1) MA22561A1 (tr)
MX (1) MX9203147A (tr)
MY (1) MY110072A (tr)
PL (1) PL170815B1 (tr)
TR (1) TR27155A (tr)
TW (1) TW215423B (tr)
WO (1) WO1993000204A1 (tr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6327784B1 (en) 1998-12-24 2001-12-11 U.S. Philips Corporation Method of manufacturing a cutting member having an auxiliary layer
US6866894B2 (en) 2000-02-29 2005-03-15 The Gillette Company Razor blade technology
US8011104B2 (en) 2006-04-10 2011-09-06 The Gillette Company Cutting members for shaving razors

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ZA928617B (en) * 1991-11-15 1993-05-11 Gillette Co Shaving system.
BR9507514A (pt) * 1994-04-25 1997-09-02 Gillette Co Processo para formação de uma lâmina de barbear l mina unidade de barbear e processo para aplicação de um revestimento duro de carbono a uma lâmina
US5490329A (en) * 1994-05-17 1996-02-13 The Gillette Company Shaving system
US5693094A (en) 1995-05-09 1997-12-02 Allergan IOL for reducing secondary opacification
US6468306B1 (en) 1998-05-29 2002-10-22 Advanced Medical Optics, Inc IOL for inhibiting cell growth and reducing glare
US6884262B2 (en) 1998-05-29 2005-04-26 Advanced Medical Optics, Inc. Enhanced intraocular lens for reducing glare
US6162249A (en) * 1998-05-29 2000-12-19 Allergan IOI for inhibiting cell growth and reducing glare
US20050028389A1 (en) * 2001-06-12 2005-02-10 Wort Christopher John Howard Cvd diamond cutting insert
EP1419036A1 (en) 2001-07-11 2004-05-19 Koninklijke Philips Electronics N.V. Cutting member with dual profile tip
US6648741B2 (en) 2002-03-14 2003-11-18 Advanced Medical Optics, Inc. Apparatus for protecting the edge geometry of an intraocular lens during glass bead polishing process
GB0212530D0 (en) * 2002-05-30 2002-07-10 Diamanx Products Ltd Diamond cutting insert
US20050246904A1 (en) * 2002-08-21 2005-11-10 Koninklijke Philips Electronics N.V. Cutting member having a superlattice coating
CA2548735C (en) 2003-12-09 2012-11-13 Advanced Medical Optics, Inc. Foldable intraocular lens and method of making
AU2007215243A1 (en) * 2006-02-10 2007-08-23 Eveready Battery Company, Inc. Multi-layer coating for razor blades
US7882640B2 (en) * 2006-03-29 2011-02-08 The Gillette Company Razor blades and razors
US20130014395A1 (en) 2011-07-14 2013-01-17 Ashok Bakul Patel Razor blades having a large tip radius
US20130014396A1 (en) 2011-07-14 2013-01-17 Kenneth James Skrobis Razor blades having a wide facet angle
CN106584525A (zh) * 2015-10-20 2017-04-26 余荣恺 理发剪的刀头及其制造方法
EP3372362A1 (en) * 2017-03-08 2018-09-12 BIC-Violex S.A. Razor blade
WO2021211815A1 (en) 2020-04-16 2021-10-21 The Gillette Company Llc Coatings for a razor blade
BR112022020877A2 (pt) 2020-04-16 2022-11-29 Gillette Co Llc Revestimentos multicamadas para uma lâmina de barbear ou depilar
US11794366B2 (en) 2020-04-16 2023-10-24 The Gillette Company Llc Coatings for a razor blade
US20230373122A1 (en) 2022-05-20 2023-11-23 The Gillette Company Llc Non-fluorinated organic coating material for a razor blade
US20230373120A1 (en) 2022-05-20 2023-11-23 The Gillette Company Llc Method of coating a razor blade
DE102022213666A1 (de) * 2022-12-14 2024-06-20 Wmf Gmbh Schneidklinge und Verfahren zu deren Herstellung

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US3480483A (en) * 1965-05-06 1969-11-25 Wilkinson Sword Ltd Razor blades and methods of manufacture thereof
US3349488A (en) * 1966-08-09 1967-10-31 Burnie J Craig Razor blades
US3829969A (en) * 1969-07-28 1974-08-20 Gillette Co Cutting tool with alloy coated sharpened edge
US3802078A (en) * 1971-06-07 1974-04-09 P Denes Cutting device and method for making same
US3761374A (en) * 1971-07-09 1973-09-25 Gillette Co Process for producing an improved cutting tool
US4291463A (en) * 1979-12-31 1981-09-29 Warner-Lambert Company Water-soluble shaving aid for razor blades
DE3047888A1 (de) * 1980-12-19 1982-07-15 Philips Patentverwaltung Gmbh, 2000 Hamburg "schneidwerkzeug, verfahren zu seiner herstellung und seine verwendung"
BR8307616A (pt) * 1982-11-19 1984-10-02 Gillette Co Laminas de barbear
US4586255A (en) * 1984-10-15 1986-05-06 The Gillette Company Razor blade assembly
US4933058A (en) * 1986-01-23 1990-06-12 The Gillette Company Formation of hard coatings on cutting edges
WO1992019425A2 (en) * 1991-04-26 1992-11-12 The Gillette Company Improvements in or relating to razor blades

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6327784B1 (en) 1998-12-24 2001-12-11 U.S. Philips Corporation Method of manufacturing a cutting member having an auxiliary layer
US6866894B2 (en) 2000-02-29 2005-03-15 The Gillette Company Razor blade technology
US8011104B2 (en) 2006-04-10 2011-09-06 The Gillette Company Cutting members for shaving razors
US8347512B2 (en) 2006-04-10 2013-01-08 The Gillette Company Cutting members for shaving razors
US8640344B2 (en) 2006-04-10 2014-02-04 The Gillette Company Cutting members for shaving razors

Also Published As

Publication number Publication date
DE69226640D1 (de) 1998-09-17
TR27155A (tr) 1994-11-09
CZ286598B6 (cs) 2000-05-17
DE69226640T2 (de) 1999-03-18
EG19616A (en) 1995-07-27
ATE169547T1 (de) 1998-08-15
CN1068990A (zh) 1993-02-17
PL170815B1 (en) 1997-01-31
TW215423B (tr) 1993-11-01
JPH07503377A (ja) 1995-04-13
CN1039793C (zh) 1998-09-16
WO1993000204A1 (en) 1993-01-07
MY110072A (en) 1997-12-31
CZ289093A3 (en) 1995-04-12
EP0591339A1 (en) 1994-04-13
ES2118821T3 (es) 1998-10-01
DK0591339T3 (da) 1999-02-15
MX9203147A (es) 1993-02-01
CA2111343A1 (en) 1993-01-07
CA2111343C (en) 1998-07-28
AU2192792A (en) 1993-01-25
EP0591339A4 (tr) 1994-08-31
AU667816B2 (en) 1996-04-18
KR100245979B1 (ko) 2000-05-01
MA22561A1 (fr) 1992-12-31
JP3722829B2 (ja) 2005-11-30

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