Patent US4273580A successfully refreshed from Google Patents.
US4273580A
Expired / Lapsed
US
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Reinforced jacket crown and method of construction
Assignee: Individual
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Filing: 1979-04-04
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Granted: 1981-06-16
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Expires: 1999-04-04
Abstract
Abstract The reinforced jacket crown of the present invention comprises an inner structure including a thin metal foil of platinum conforming in shape to the tooth preparation to be restored, at least one fired on coating of a composition of finely divided particles of from about 1 to 100% by weight of a noble metal halide in combination with from zero to 99% by weight of a noble based metal and a relatively thick fired on outer coating of dental porcelain.
Inventors
- 👤 Itzhak Shoher
- 👤 Aharon E. Whiteman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:22
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/0003; A61C5/00; A61C5/70; A61C5/73; A61C5/77; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844; Y; Y10; Y10S; Y10S75/00; Y10S75/955; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A reinforced porcelain jacket crown restoration comprising a composite body including a thin metal foil of platinum conforming in shape to the tooth preparation to be restored, at least one thin intermediate coating of a predetermined composition of finely divided particles bonded to said thin metal foil at an elevated sintering temperature above at least 1600° F.; said composition comprising, from about 1 to 100% by weight of a noble metal chloride with said noble metal being selected from the group consisting of gold, silver, palladium and platinum in combination with from zero to 99% by weight of a gold based noble metal; and a relatively thick fired on outer coating of dental porcelain.
Claim 2
Dependent Claim
114 words
A reinforced porcelain jacket crown restoration comprising a composite body including a thin metal foil of platinum conforming in shape to the tooth preparation to be restored, at least one thin intermediate coating of a predetermined composition of finely divided particles bonded to said thin metal foil at an elevated sintering temperature above at least 1600° F.; said composition comprising, from about 1 to 100% by weight of a noble metal chloride with said noble metal being selected from the group consisting of gold, silver, palladium and platinum in combination with from zero to 99% by weight of a gold based noble metal; and a relatively thick fired on outer coating of dental porcelain.
Claim 3
Dependent Claim
34 words
A reinforced jacket crown as defined in claim 1 wherein said thin intermediate coating is uniformly wetted to said thin platinum foil at a first sintering temperature between about 1875° F. to 1975° F.
Claim 4
Dependent Claim
37 words
A reinforced jacket crown as defined in claim 2 further comprising a second thin coating equivalent in composition to said intermediate coating and being bonded thereupon at a sintering temperature to form beaded particles of irregular size.
Claim 5
Dependent Claim
22 words
A reinforced jacket crown as defined in claim 3 wherein said finely divided particle composition is suspended in a volatizing carrying vehicle.
Claim 6
Dependent Claim
50 words
A reinforced jacket crown as defined in claim 3 wherein said noble based metal particles comprises at least about 50% by weight finely divided gold particles in combination with from zero to 45% finely divided noble metal particles selected from the group consisting of silver, platinum, palladium, rhodium and indium.
Claim 7
Independent Claim
116 words
A method of constructing a reinforced porcelain jacket crown comprising the steps of: coating the surface of a platinum metal strip with a predetermined material composition of finely divided particles of from about 1 to 100% by weight of a noble metal halide in combination with from zero to 99% by weight of noble based metal particles; sintering said coated strip at an elevated temperature in a range of between about 1875° F. to 1975° F. forming an inner structure for said crown by adapting said strip to a die of a tooth preparation to be restored; and firing a predetermined number of porcelain layers over said inner structure to form a relatively thick outer coating.
Claim 8
Independent Claim
116 words
A method of constructing a reinforced porcelain jacket crown comprising the steps of: coating the surface of a platinum metal strip with a predetermined material composition of finely divided particles of from about 1 to 100% by weight of a noble metal halide in combination with from zero to 99% by weight of noble based metal particles; sintering said coated strip at an elevated temperature in a range of between about 1875° F. to 1975° F. forming an inner structure for said crown by adapting said strip to a die of a tooth preparation to be restored; and firing a predetermined number of porcelain layers over said inner structure to form a relatively thick outer coating.
Claim 9
Dependent Claim
42 words
A method as defined in claim 1 further comprising the step of applying a second coating of said predetermined material composition upon said sintered coated strip and sintering said second coating in a temperature range between about 1775° F. to 1875° F.
Claim 10
Dependent Claim
19 words
A method as defined in claim 7 wherein said second coating is applied before said inner structure is formed.
Claim 11
Dependent Claim
19 words
A method as defined in claim 7 wherein said second coating is applied after said inner structure is formed.
Claim 12
Dependent Claim
19 words
A method as defined in claim 6 wherein said noble metal halide is a gold based noble metal chloride.
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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |