Patent US1919117A successfully refreshed from Google Patents.
Patent US5232568A successfully refreshed from Google Patents.
US5232568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Razor technology
Assignee: Gillette Co LLC
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Filing: 1991-06-24
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Granted: 1993-08-03
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Expires: 2011-06-24
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 200-2,000 angstroms and that defines a tip radius of less than about 500 angstroms, an aspect ratio in the range of 1:13-3:1, a hardness of at least thirteen gigapascals and an L5 wet wool felt cutter force of less than 0.8 kilogram.
Inventors
- 👤 C. Robert Parent
- 👤 John Madeira
- 👤 Steve S. Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:26
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/54; B26B21/58; B26B21/60
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
134 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; disposing said substrate and a solid target member in a chamber; and sputtering said solid target member to generate carbon atoms for forming a layer of diamond or diamond-like carbon material on said sharpened edge of said substrate from said carbon atoms from said solid target member while an RF bias is applied to said substrate; said layer of diamond or diamond-like carbon material having a radius at the ultimate tip of said diamond or diamond-like carbon material of less than 500 angstroms and an aspect ratio in the range of 1:1-3:1.
Claim 2
Dependent Claim
134 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; disposing said substrate and a solid target member in a chamber; and sputtering said solid target member to generate carbon atoms for forming a layer of diamond or diamond-like carbon material on said sharpened edge of said substrate from said carbon atoms from said solid target member while an RF bias is applied to said substrate; said layer of diamond or diamond-like carbon material having a radius at the ultimate tip of said diamond or diamond-like carbon material of less than 500 angstroms and an aspect ratio in the range of 1:1-3:1.
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
25 words
The process of claim 1 and further including the step of applying an adherent polymer coating on said diamond or diamond-like carbon coated sharpened edge.
Claim 6
Dependent Claim
35 words
The process of claim 1 and further including the step of depositing a layer of molybdenum on said sharpened edge; and said layer of diamond or diamond-like carbon material is deposited on said molybdenum layer.
Claim 7
Dependent Claim
50 words
The process of claim 5 wherein said molybdenum layer on said cutting edge is deposited to a thickness of less than about five hundred angstrom, and said diamond or diamond-like carbon coating on said molybdenum coated sharpened edge is deposited to a thickness of less than about two thousand angstroms.
Claim 8
Dependent Claim
86 words
The process of claim 1 wherein said solid target member is of high purity graphite; said layer of diamond or diamond-like carbon material is deposited in an argon atmosphere in an evacuated chamber in which said high purity graphite target and a shutter are located; said graphite target is energized; said RF bias is applied to said substrate; and said shutter is opened to deposit said layer of diamond or diamond-like carbon material on said sharpened edge while said RF bias is applied to said substrate.
Claim 9
Dependent Claim
28 words
The process of claim 7 and further including a molybdenum target in said chamber, and further including the step of depositing a molybdenum layer on said blade edge.
Claim 10
Dependent Claim
111 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 1,000 angstroms; disposing said substrate and a solid target member in a chamber; and sputtering said solid target member to generate carbon atoms for forming a layer of diamond or diamond-like carbon material on said wedge-shaped edge while an RF bias is applied to said substrate to provide a radius at the ultimate tip of said diamond or diamond-like carbon material of less than 500 angstroms and an aspect ratio in the range of 1:1-3:1.
Claim 11
Dependent Claim
111 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 1,000 angstroms; disposing said substrate and a solid target member in a chamber; and sputtering said solid target member to generate carbon atoms for forming a layer of diamond or diamond-like carbon material on said wedge-shaped edge while an RF bias is applied to said substrate to provide a radius at the ultimate tip of said diamond or diamond-like carbon material of less than 500 angstroms and an aspect ratio in the range of 1:1-3:1.
Claim 12
Dependent Claim
83 words
The process of claim 9 wherein said solid target member is of high purity graphite; said layer of diamond or diamond-like material is deposited in an argon atmosphere in an evacuated chamber in which said high purity graphite target and a shutter are located; said graphite target is energized; said RF bias is applied to said substrate; and said shutter is opened to deposit said layer of diamond or diamond-like material on said edge while said RF bias is applied to said substrate.
Claim 13
Dependent Claim
28 words
The process of claim 9 wherein said diamond or diamond-like carbon coating on said wedge-shaped wedge is deposited to a thickness of less than about two thousand angstroms.
Claim 14
Dependent Claim
25 words
The process of claim 11 and further including the step of applying an adherent polymer coating on said diamond or diamond-like carbon coated wedge-shaped edge.
References Cited (Backward Citations)
US2108797A
Cited
US2408790A
Cited
US3345202A
Cited
US3518110A
Cited
US3263328A
Cited
US3501334A
Cited
US3349488A
Cited
US3829969A
Cited
US3743551A
Cited
US3652443A
Cited
US3900636A
Cited
US3761372A
Cited
US3961103A
Cited
US3890704A
Cited
US4416912A
Cited
US4504519A
Cited
US4434188A
Cited
US4720918A
Cited
US4490229A
Cited
US4586255A
Cited
US4816286A
Cited
US4933058A
Cited
US4849290A
Cited
US4822466A
Cited
US4816291A
Cited
US4902535A
Cited
WO1990003455A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-02 | 2001-02-01 | 2001-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-02 | 2005-02-01 | 2005-08-03 | $7700.00 | Window Closed / Lapsed |