Patent US4447210A successfully refreshed from Google Patents.
US4447210A
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Upper structure for artificial apatite dental root
Assignee: Pentax Corp
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Filing: 1982-12-15
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Granted: 1984-05-08
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Expires: 2002-12-15
Abstract
Abstract An upper structure for an artificial apatite dental root is disclosed. The structure includes inner and outer crowns having a buffer element placed therebetween. The buffer element serves as a satisfactory substitute for the periodontal membrane of a natural tooth.
Inventors
- 👤 Tsuneo Hidaka
- 👤 Masahide Inoue
- 👤 Makoto Ogiso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:21
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0086
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
An upper structure for an artificial apatite dental root comprising an inner crown having a lower skirt portion and an upper central recess adapted to be fixedly secured to said root, an outer crown having a lower portion adapted to overlie said skirt portion in spaced relation thereto and a downwardly extending projection adapted to extend into said central recess, an annular groove formed in the lower end of said skirt portion of said inner crown, a first annular elastic member secured in said groove with the lower end of said outer crown disposed in contact with said first elastic member, opposed grooves formed in said central recess of said inner crown and said projection of said outer crown and a second annular elastic member disposed in said opposed grooves whereby said first and second elastic members support said outer crown in spaced relation to said inner crown.
Claim 2
Dependent Claim
148 words
An upper structure for an artificial apatite dental root comprising an inner crown having a lower skirt portion and an upper central recess adapted to be fixedly secured to said root, an outer crown having a lower portion adapted to overlie said skirt portion in spaced relation thereto and a downwardly extending projection adapted to extend into said central recess, an annular groove formed in the lower end of said skirt portion of said inner crown, a first annular elastic member secured in said groove with the lower end of said outer crown disposed in contact with said first elastic member, opposed grooves formed in said central recess of said inner crown and said projection of said outer crown and a second annular elastic member disposed in said opposed grooves whereby said first and second elastic members support said outer crown in spaced relation to said inner crown.
Claim 3
Dependent Claim
37 words
An upper structure for an artificial apatite dental root as set forth in claim 1 wherein said first annular elastic member has an outer surface which is substantially flush with the outer surface of said inner crown.
Claim 4
Dependent Claim
26 words
An upper structure for an artificial apatite dental root as set forth in claim 1 wherein said second elastic member is comprised of an O-shaped ring.
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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) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |