Patent DE425278C successfully refreshed from Google Patents.
US4134930A
Expired / Lapsed
US
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Resinous materials for restoring crowns
Assignee: GC Corp
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Filing: 1976-12-15
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Granted: 1979-01-16
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Expires: 1996-12-15
Abstract
Abstract Resinous materials for restoring crowns is disclosed herein, said materials prepared by mixing a modified polymethyl methacrylate in the liquid state with powders of a methacrylic resin polymer.
Inventors
- 👤 Takao Kubota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:33
CPC Classifications
C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/10; A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; Y; Y10; Y10S; Y10S528/00; Y10S528/92
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
71 words
A slurried resinous material for restoring crowns, comprising: a liquid component A having the following formula: ##STR4## wherein the average molar amount of ethylene oxide units ( m + n), present satisfies the relation: 2.2 ≦ (m + n) ≦ 6, and a power component B which is a methacrylic resin polymer, wherein said liquid component A is mixed with said powder component B in proportions ranging from 1:3 to 4:1.
Claim 2
Dependent Claim
71 words
A slurried resinous material for restoring crowns, comprising: a liquid component A having the following formula: ##STR4## wherein the average molar amount of ethylene oxide units ( m + n), present satisfies the relation: 2.2 ≦ (m + n) ≦ 6, and a power component B which is a methacrylic resin polymer, wherein said liquid component A is mixed with said powder component B in proportions ranging from 1:3 to 4:1.
Claim 3
Dependent Claim
16 words
The slurried material of claim 1, wherein said methacrylic resin polymer is polymethylmethacrylate or cross-linked polymethylmethacrylate.
Claim 4
Independent Claim
91 words
A method for restoring dental crowns, comprising: forming a slurry mixture by mixing a liquid component A having the formula: ##STR5## wherein the average molar amount of ethylene oxide units (m + n), present satisfies the relation: 2.2 ≦ (m + n) ≦ 6, and a powder component B which is a methacrylic resin polymer, wherein said liquid component A is mixed with said powder component B in proportions ranging from 1:3 to 4:1, applying said slurry mixture to a crown substrate; and polymerizing the mixture applied to said crown substrate.
Claim 5
Independent Claim
91 words
A method for restoring dental crowns, comprising: forming a slurry mixture by mixing a liquid component A having the formula: ##STR5## wherein the average molar amount of ethylene oxide units (m + n), present satisfies the relation: 2.2 ≦ (m + n) ≦ 6, and a powder component B which is a methacrylic resin polymer, wherein said liquid component A is mixed with said powder component B in proportions ranging from 1:3 to 4:1, applying said slurry mixture to a crown substrate; and polymerizing the mixture applied to said crown substrate.
Claim 6
Dependent Claim
39 words
The method of claim 3, wherein said piled mixture is prepolymerized by subjecting said piled mixture to a blast of hot air of about one minute, and then completing polymerization by heating said prepolymerized mixture to about 140° C.
Claim 7
Dependent Claim
30 words
The slurried material of claim 1, wherein said liquid component A is mixed with a compound of said formula having values of (m + n) of 2.6 to about 4.
Claim 8
Dependent Claim
20 words
The slurried material of claim 5, wherein the viscosity of said liquid component A is controlled by admixture with 2,2-bis(4-methacryloxyphenyl)propane.
References Cited (Backward Citations)
US3923740A
Cited
US3751399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |