US4129281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dowel receiving core for casting dental restorations
Assignee: Individual
•
Filing: 1977-07-22
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Granted: 1978-12-12
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Expires: 1997-07-22
Abstract
Abstract Models for dental restoration work are provided with a plurality of elongated openings through which dowels secured to individual tooth members may be reached. The openings are formed by resilient cores cast in the models. The tooth members may thus be removed and replaced from the model easily and accurately. Two or more dowels may be used in each tooth member without need for careful spacing because of the slotted construction of the cores.
Inventors
- 👤 Abraham J. Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:01
CPC Classifications
A; A61; A61C; A61C9/00; A61C9/002
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A core assembly for use in casting models for dental restorations in which dowels are incorporated within the cast material beneath individual tooth members comprising a resilient sleeve having an elongated hollow body of rectangular cross-section, an elongated resilient dowel receiving member telescopically received within the sleeve; a longitudinal slot in the free end of the dowel receiving member, dividing the said dowel receiving member into spaced jaws, a plurality of transverse dowel receiving bores in the free end of the dowel receiving member extending parallel to the plane of the slot at least one of which is in communication with the said slot, and means carried by the sleeve and dowel receiving member to exclude casting material from the interior of the sleeve.
Claim 2
Dependent Claim
124 words
A core assembly for use in casting models for dental restorations in which dowels are incorporated within the cast material beneath individual tooth members comprising a resilient sleeve having an elongated hollow body of rectangular cross-section, an elongated resilient dowel receiving member telescopically received within the sleeve; a longitudinal slot in the free end of the dowel receiving member, dividing the said dowel receiving member into spaced jaws, a plurality of transverse dowel receiving bores in the free end of the dowel receiving member extending parallel to the plane of the slot at least one of which is in communication with the said slot, and means carried by the sleeve and dowel receiving member to exclude casting material from the interior of the sleeve.
Claim 3
Dependent Claim
38 words
A core assembly according to claim 1 in which the sleeve is flanged at one end, open at its opposite end and provided with means to engage the dowel receiving member to yieldably secure it within the sleeve.
Claim 4
Dependent Claim
32 words
A core assembly according to claim 2 in which the securing means comprises a boss interiorly carried by the sleeve and a rib on the dowel receiving member engagable with said boss.
Claim 5
Dependent Claim
31 words
A core assembly according to claim 2 in which the sleeve is formed with a stop recess to receive a stepped portion on the free end of the dowel receiving member.
Claim 6
Dependent Claim
19 words
A core assembly according to claim 4 in which the longitudinal slot and bores extend through the stepped portion.
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) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |