US4470895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coatings for cutting implements
Assignee: United Kingdom Atomic Energy Authority
•
Filing: 1983-03-22
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Granted: 1984-09-11
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Expires: 2003-03-22
Abstract
Abstract An edged cutting implement is provided with a refractory material coating that terminates adjacent a cutting edge of the implement to improve its cutting performance by depositing the coating on the implement by means of ion plating under conditions such that the coating terminates adjacent a cutting edge of the implement so as not to cover the cutting edge.
Inventors
- 👤 Joseph P. Coad
- 👤 Samuel R. Keown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:53
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/54; B26B21/58; B26B21/60
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
55 words
A method of treating an edged cutting implement which comprises depositing a coating of a refractory material on the implement by means of sputter ion plating, said sputter ion plating being carried out using a sufficiently high bias current to prevent deposition of the coating at and near an edge of the edged cutting implement.
Claim 2
Independent Claim
55 words
A method of treating an edged cutting implement which comprises depositing a coating of a refractory material on the implement by means of sputter ion plating, said sputter ion plating being carried out using a sufficiently high bias current to prevent deposition of the coating at and near an edge of the edged cutting implement.
Claim 3
Dependent Claim
14 words
A method as claimed in claim 1 wherein the refractory material is titanium nitride.
Claim 4
Dependent Claim
18 words
A method as claimed in claim 1 wherein the implement is in the form of a knife blade.
Claim 5
Dependent Claim
17 words
A method as claimed in claim 1 wherein the implement is in the form of a drill.
References Cited (Backward Citations)
US3064349A
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US3916523A
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US3732158A
Cited
GB1380583A
Cited
US3900636A
Cited
GB1438654A
Cited
US3915757A
Cited
US4054426A
Cited
US3975891A
Cited
GB2063920A
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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) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |