Patent US4594294A successfully refreshed from Google Patents.
US4594294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer coating including disordered, wear resistant boron carbon external coating
Assignee: Bodycote Metallurgical Coatings Inc
•
Filing: 1984-10-09
•
Granted: 1986-06-10
•
Expires: 2004-10-09
Abstract
Abstract A wear resistant multilayer coating is provided. The wear resistant coating comprises at least one internal layer and a thin, external layer of disordered boron and carbon applied to a substrate. The synergistic interaction of a hard internal layer and a lubricious boron and carbon layer provides a long lived tool coating. In a more specific embodiment, the external layer of the coating is disordered boron carbide. In accordance with one embodiment, the disordered boron and carbon external coating is of a composition B x C 1-x where x is from about 0.60 to about 0.90.
Inventors
- 👤 Erwin Eichen
- 👤 James Flasck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:12
CPC Classifications
A; A61; A61C; A61C3/00; A61C3/02; C; C23; C23C; C23C14/00; C23C14/06; C23C14/0635; C23C28/00; C23C28/04; C23C28/044; C23C30/00; C23C30/005; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A coated article comprising: (a) a substrate; (b) a multilayer coating on said substrate, said multilayer coating comprising: (i) a first titanium nitride layer on the substrate; (ii) a titanium carbide layer atop the first titanium nitride; (iii) an alumina layer atop the titanium carbide layer; (iv) a second titanium nitride layer atop the titanium carbode layer; and (v) an external layer of disordered boron and carbon.
Claim 2
Dependent Claim
67 words
A coated article comprising: (a) a substrate; (b) a multilayer coating on said substrate, said multilayer coating comprising: (i) a first titanium nitride layer on the substrate; (ii) a titanium carbide layer atop the first titanium nitride; (iii) an alumina layer atop the titanium carbide layer; (iv) a second titanium nitride layer atop the titanium carbode layer; and (v) an external layer of disordered boron and carbon.
Claim 3
Dependent Claim
30 words
The coated article of claim 1 wherein the external layer has composition on an atomic basis of B x C 1-x where x is from about 0.60 to about 0.90.
Claim 4
Dependent Claim
15 words
The coated article of claim 2 wherein the disordered boron and carbon comprises amorphous material.
Claim 5
Dependent Claim
15 words
The coated article of claim 2 wherein the disordered boron and carbon comprises polycrystalline material.
Claim 6
Dependent Claim
15 words
The coated article of claim 2 wherein the disordered boron and carbon comprises microcrystalline material.
Claim 7
Dependent Claim
28 words
The coated article of claim 2 wherein the disordered boron and carbon comprises at least one phase selected from the group consisting of amorphous, microcrystalline, and polycrystalline phases.
Claim 8
Dependent Claim
15 words
The coated article of claim 2 wherein the disordered boron and carbon is substantially amorphous.
Claim 9
Dependent Claim
16 words
The coated article of claim 2 wherein the disordered boron and carbon comprises disordered boron carbide.
References Cited (Backward Citations)
US4017587A
Cited
US3671306A
Cited
US3867191A
Cited
US3967029A
Cited
US4177473A
Cited
US4225355A
Cited
US4287259A
Cited
DE3206322A1
Cited
US4343865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |