Patent US4424037A successfully refreshed from Google Patents.
US4424037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental implant
Assignee: Nikon Corp
•
Filing: 1982-01-29
•
Granted: 1984-01-03
•
Expires: 2002-01-29
Abstract
Abstract Dental implant is composed of a core and a coating layer of a biologically active glass or glass-ceramic material covering at least a part of the core to be embedded in the jawbone. The glass or glass-ceramic layer comprises at least two separated portions spaced from each other.
Inventors
- 👤 Makoto Ogino
- 👤 Takamitsu Fujiu
- 👤 Toshihiko Futami
- 👤 Michio Kariya
- 👤 Takeo Ichimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:54
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0018; A61C8/0012; A61C8/0013
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
65 words
In a dental implant comprising a core member and a coating layer of a biologically active glass or glass-ceramic material covering at least part of the portion of said core member which is to be embedded in the jawbone, the improvement wherein said coating layer comprises at least two portions completely separated from each other, thereby preventing propagation of cracks over the entire coating layer.
Claim 2
Dependent Claim
65 words
In a dental implant comprising a core member and a coating layer of a biologically active glass or glass-ceramic material covering at least part of the portion of said core member which is to be embedded in the jawbone, the improvement wherein said coating layer comprises at least two portions completely separated from each other, thereby preventing propagation of cracks over the entire coating layer.
Claim 3
Dependent Claim
26 words
A dental implant according to the claim 1, wherein a rib protruding from said core member is present between said separated zones of the coating layer.
References Cited (Backward Citations)
GB1446097A
Cited
US3981736A
Cited
US4120730A
Cited
DE2708917A1
Cited
US4164794A
Cited
US4171544A
Cited
US4234972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |