US3792531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental restorative material of improved polishability
Assignee: Lee Pharmaceuticals Inc
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Filing: 1970-12-28
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Granted: 1974-02-19
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Expires: 1990-12-28
Abstract
Abstract Dental restorative compositions which are a blend of a liquid polymerizable organic binder and a filler comprising vitreous particles having diameters between about 0.700 microns and 30 microns wherein said particles average by weight between 2 and 20 microns in diameter, at least one half by weight of said particles have a size range of less than 20 microns. A preferred filler is crystalline quartz wherein the particles have diameters between 0.700 microns and 30 microns and average by weight between 2 and 20 microns in diameter, and wherein 80 percent by weight of said particles are under 20 microns in diameter and at least 20 percent by weight of said particles are under 5 microns in diameter.
Inventors
- 👤 C Rossi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:51
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
23 words
A method as claimed in claim 1 wherein at least 80 percent by weight of said particles are under 20 microns in diameter.
Claim 2
Dependent Claim
21 words
A method as claimed in claim 1 wherein 20 percent by weight of said particles are under 5 microns in diameter.
Claim 3
Dependent Claim
21 words
A method as claimed in claim 2 wherein 20 percent by weight of said particles are under 5 microns in diameter.
Claim 4
Dependent Claim
112 words
In a method for filling a cavity in a tooth which includes the steps of filling said cavity with a blend of initially liquid polymerizable organic binder and a solid inorganic filler, and thereafteR hardening said blend in situ, the improvement to produce a filling having a hard, smooth, polished surface which comprises utilizing as said filler one consisting essentially of single quartz particles having diameters between about 0.700 microns and 30 microns, said particles averaging by weight between 2 and 20 microns in diameter, and at least one-half by weight of said particles have a size range of less than 20 microns, and then polishing the tooth surface containing said filling.
Claim 5
Dependent Claim
23 words
A method as claimed in claim 5 wherein at least 80 percent by weight of said particles are under 20 microns in diameter.
Claim 6
Dependent Claim
21 words
A mehtod as claimed in claim 5 wherein 20 percent by weight of said particles are under 5 microns in diameter.
Claim 7
Dependent Claim
21 words
A method as claimed in claim 6 wherein 20 percent by weight of said particles are under 5 microns in diameter.
References Cited (Backward Citations)
US3452437A
Cited
US3449832A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |