US5142785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Razor technology
Assignee: Gillette Co LLC
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Filing: 1991-08-26
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Granted: 1992-09-01
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Expires: 2011-08-26
Abstract
Abstract A razor blade includes a substrate with a wedge-shaped edge, a layer of molybdenum on the tip and flanks of the wedge-shaped edge, the thickness of the molybdenum layer preferably being in the range of about 50-500 angstroms, and a layer of diamond or diamond-like material on the molybdenum layer that preferably has a thickness of about 200-1,500 angstroms and that defines a tip radius of less than about 1000 angstroms.
Inventors
- 👤 Manohar S. Grewal
- 👤 Chong-Ping P. Chou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:33
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/54; B26B21/58; B26B21/60; Y; Y10; Y10S; Y10S76/00; Y10S76/08
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
78 words
A process for forming a razor blade comprising the steps of providing a substrate, forming a wedge-shaped sharpened edge on said substrate that has an included angle of less than thirty degrees and a tip radius of less than twelve hundred angstroms; depositing a layer of molybdenum on said sharpened edge; depositing a layer of diamond or diamond-like carbon material on said molybdenum layer; and applying an adherent polymer coating on said diamond or DLC coated cutting edge.
Claim 2
Dependent Claim
78 words
A process for forming a razor blade comprising the steps of providing a substrate, forming a wedge-shaped sharpened edge on said substrate that has an included angle of less than thirty degrees and a tip radius of less than twelve hundred angstroms; depositing a layer of molybdenum on said sharpened edge; depositing a layer of diamond or diamond-like carbon material on said molybdenum layer; and applying an adherent polymer coating on said diamond or DLC coated cutting edge.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein said substrate is mechanically abraded in a sequence of grinding, rough-honing and finish-honing steps to form said sharpened edge.
Claim 4
Dependent Claim
21 words
The process of claim 2 wherein said finish-honing step forms facets that have an included angle of less than thirty degrees.
Claim 5
Dependent Claim
45 words
The process of claim 1 wherein said molybdenum layer on said cutting edge has a thickness of less than about five hundred angstroms, and said diamond or DLC coating on said molybdenum coated cutting edge has a thickness of less than about fifteen hundred angstroms.
Claim 6
Dependent Claim
34 words
The process of claim 1 wherein said step of forming said wedge-shaped edge includes a finish-honing step that forms a sharpened edge with an ultimate tip radius of less than about twelve hundred angstroms.
Claim 7
Dependent Claim
68 words
The process of claim 1 wherein said layer of diamond or DLC carbon material is deposited by a technique selected from the group consisting of plasma decomposition of hydrocarbon gases, sputter deposition using ions from either a plasma or an ion gun to bombard a graphite target, directly using a beam of carbon ions, and an ion beam assisted deposition (IBAD) process using either E-Beam or sputtering sources.
Claim 8
Dependent Claim
92 words
A process for forming a razor blade comprising the steps of providing a substrate, forming on said substrate a wedge-shaped edge that has an included angle of less than 30° and a tip radius less than 1,200 angstroms; depositing a layer of molybdenum on said wedge-shaped edge; depositing a layer of diamond or diamond-like material on said molybdenum layer to provide a radius at the ultimate tip of said diamond or diamond-like material of less than 1,200 angstroms; and applying and adherent polymer coating on said diamond or DLC coated cutting edge.
Claim 9
Dependent Claim
92 words
A process for forming a razor blade comprising the steps of providing a substrate, forming on said substrate a wedge-shaped edge that has an included angle of less than 30° and a tip radius less than 1,200 angstroms; depositing a layer of molybdenum on said wedge-shaped edge; depositing a layer of diamond or diamond-like material on said molybdenum layer to provide a radius at the ultimate tip of said diamond or diamond-like material of less than 1,200 angstroms; and applying and adherent polymer coating on said diamond or DLC coated cutting edge.
Claim 10
Dependent Claim
19 words
The process of claim 7 wherein said layers of molybdenum and diamond or diamond-like material are deposited by sputtering.
Claim 11
Dependent Claim
45 words
The process of claim 7 wherein said molybdenum layer on said wedge-shaped edge has a thickness of less than about five hundred angstroms, and said diamond or DLC coating on said molybdenum coated cutting edge has a thickness of less than about fifteen hundred angstroms.
Claim 12
Dependent Claim
66 words
A razor blade comprising a substrate with a wedge-shaped edge defined by facets that have a width of at least about 0.1 millimeter and an included angle of less than thirty degrees, a layer of molybdenum on said wedge-shaped edge; a layer of diamond or diamond-like carbon material on said molybdenum layer; and applying an adherent polymer coating on said diamond or DLC coated cutting edge.
Claim 13
Dependent Claim
66 words
A razor blade comprising a substrate with a wedge-shaped edge defined by facets that have a width of at least about 0.1 millimeter and an included angle of less than thirty degrees, a layer of molybdenum on said wedge-shaped edge; a layer of diamond or diamond-like carbon material on said molybdenum layer; and applying an adherent polymer coating on said diamond or DLC coated cutting edge.
Claim 14
Dependent Claim
32 words
The razor blade of claim 10 wherein said layer of diamond or diamond-like carbon (DLC) material has a Raman peak at about 1331 cm -1 (diamond) or about 1552 cm -1 (DLC).
Claim 15
Dependent Claim
38 words
The razor blade of claim 11 wherein said layer of diamond or diamond-like carbon (DLC) has an aspect ratio of less than about 3:1; substantial sp3 carbon bonding; and a mass density greater than 1.5 grams/cm 3 .
Claim 16
Dependent Claim
40 words
The razor blade of claim 11 wherein said molybdenum layer has a thickness of less than about five hundred angstroms, and said diamond or DLC coating on said molybdenum layer has a thickness of less than about fifteen hundred angstroms.
Claim 17
Dependent Claim
76 words
A razor blade comprising a substrate with a wedge-shaped edge, a layer of molybdenum on the tip and flanks of said wedge-shaped edge, the thickness of said molybdenum layer being in the range of about 50-500 angstroms, and a layer of diamond or diamond-like carbon material on said molybdenum layer, said layer of diamond or diamond-like carbon material having a thickness of about 200-1,500 angstroms and defining a tip radius of less than about 1,000 angstroms.
Claim 18
Dependent Claim
76 words
A razor blade comprising a substrate with a wedge-shaped edge, a layer of molybdenum on the tip and flanks of said wedge-shaped edge, the thickness of said molybdenum layer being in the range of about 50-500 angstroms, and a layer of diamond or diamond-like carbon material on said molybdenum layer, said layer of diamond or diamond-like carbon material having a thickness of about 200-1,500 angstroms and defining a tip radius of less than about 1,000 angstroms.
Claim 19
Dependent Claim
38 words
The razor blade of claim 14 wherein said substrate is steel; said wedge-shaped edge is formed by a sequence of mechanical abrading steps; and said layers of molybdenum and diamond or diamond-like carbon material are formed by sputtering.
Claim 20
Dependent Claim
62 words
The razor blade of claim 15 wherein said layer of diamond or diamond-like carbon (DLC) material has substantial sp3 carbon bonding; a mass density greater than 1.5 grams/cm 3 ; and a Raman peak at about 1331 cm -1 (diamond) or about 1552 cm -1 (DLC); and further including an adherent polymer coating on said layer of diamond or diamond-like carbon material.
Claim 21
Dependent Claim
80 words
A shaving unit comprising support structure that defines spaced skin-engaging surfaces, and razor blade structure secured to said support structure, said razor blade structure including a substrate with a wedge-shaped edge, a layer of molybdenum on said wedge-shaped edge; a layer of diamond or diamond-like carbon material on said molybdenum layer, said diamond or diamond-like carbon coated wedge-shaped edge being disposed between said skin-engaging surfaces; and an adherent polymer coating on each said layer of diamond or diamond-like carbon material.
Claim 22
Dependent Claim
80 words
A shaving unit comprising support structure that defines spaced skin-engaging surfaces, and razor blade structure secured to said support structure, said razor blade structure including a substrate with a wedge-shaped edge, a layer of molybdenum on said wedge-shaped edge; a layer of diamond or diamond-like carbon material on said molybdenum layer, said diamond or diamond-like carbon coated wedge-shaped edge being disposed between said skin-engaging surfaces; and an adherent polymer coating on each said layer of diamond or diamond-like carbon material.
Claim 23
Dependent Claim
29 words
The shaving unit of claim 17 wherein said razor blade structure includes two substrates, and said coated wedge-shaped edges are disposed parallel to one another between said skin-engaging surfaces.
Claim 24
Dependent Claim
78 words
The shaving unit of claim 18 wherein each said layer of diamond or diamond-like carbon material has substantial sp3 carbon bonding; a mass density greater than 1.5 grams/cm 3 ; and a Raman peak at about 1331 cm -1 (diamond) or 1552 cm -1 (DLC); each said molybdenum layer has a thickness of less than five hundred angstroms; and each said diamond or DLC coating on said molybdenum layer has a thickness of less than fifteen hundred angstroms.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |