US4849290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina coated with diamond
Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1987-08-11
•
Granted: 1989-07-18
•
Expires: 2007-08-11
Abstract
Abstract Alumina coated with diamond comprises an alumina substrate, a silicon carbide film formed on the alumina substrate, and a diamond film formed on the silicon carbide film.
Inventors
- 👤 Naoji Fujimori
- 👤 Takahiro Imai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:01
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/148; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
28 words
Alumina coated with diamond, comprising an alumina substrate, an amorphous silicon carbide film disposed on said alumina substrate, and a diamond film disposed on said silicon carbide film.
Claim 2
Dependent Claim
28 words
Alumina coated with diamond, comprising an alumina substrate, an amorphous silicon carbide film disposed on said alumina substrate, and a diamond film disposed on said silicon carbide film.
Claim 3
Dependent Claim
19 words
Alumina coated with diamond as claimed in claim 1, wherein said silicon carbide film has thickness of 0.1-30 μm.
Claim 4
Dependent Claim
18 words
Alumina coated with diamond as claimed in claim 1, wherein said diamond film has thickness of 0.5-30 μm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |