Patent US4369262A successfully refreshed from Google Patents.
US4369262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental material based on crosslinked plastic and polymerizable binder
Assignee: Bayer AG
•
Filing: 1981-07-16
•
Granted: 1983-01-18
•
Expires: 2001-07-16
Abstract
Abstract The invention includes dental materials based on organic plastics in paste form, comprising at least one phase consisting essentially of finely divided, crosslinked plastics which contain copolymerized ester(s) of methacrylic acid to the extent of at least 50% by weight, and the second phase consisting essentially of ester(s) of methacrylic acid to the extent of at least 50% by weight. The materials can be used for making prostheses, crowns, bridges, artificial teeth, dental fillings, etc.
Inventors
- 👤 Michael Walkowiak
- 👤 Wolfgang Podszun
- 👤 Bernhard Leusner
- 👤 Carlhans Suling
- 👤 Hans-Hermann Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:27
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
A dental material in paste form consisting essentially of (1) at least one phase of at least one finely divided, cross-linked plastic wherein at least 50% by weight of said finely divided, cross-linked plastic is made from at least one ester of methacrylic acid and a monohydric or polyhydric alcohol, said cross-linked plastic comprising 40 to 80% by weight of the dental material and said cross-linked plastic being made from a monomeric mixture containing 2 to 35% by weight of crosslinking agent and (2) a second phase consisting of polymerizable binder in which at least 50% by weight of said binder is at least one ester of methacrylic acid and a monohydric or polyhydric alcohol.
Claim 2
Dependent Claim
115 words
A dental material in paste form consisting essentially of (1) at least one phase of at least one finely divided, cross-linked plastic wherein at least 50% by weight of said finely divided, cross-linked plastic is made from at least one ester of methacrylic acid and a monohydric or polyhydric alcohol, said cross-linked plastic comprising 40 to 80% by weight of the dental material and said cross-linked plastic being made from a monomeric mixture containing 2 to 35% by weight of crosslinking agent and (2) a second phase consisting of polymerizable binder in which at least 50% by weight of said binder is at least one ester of methacrylic acid and a monohydric or polyhydric alcohol.
Claim 3
Dependent Claim
31 words
A dental material according to claim 1, in which the finely divided, crosslinked plastic is in the form of crosslinked polymer beads with an average particle size of 10 to 100μ.
Claim 4
Dependent Claim
27 words
A dental material in paste form according to claim 1 or 2 wherein the finely divided, crosslinked plastic is present in an amount from 50 to 75%.
Claim 5
Dependent Claim
37 words
A dental material according to claim 1, in which the finely divided, crosslinked plastic is produced from from at least one aliphatic or cycloaliphatic ester of methacrylic acid to the extend of more than 80% by weight.
Claim 6
Dependent Claim
31 words
A dental material according to claim 1 in which more than 80% by weight of said binder is at least one ester of methacrylic acid and a monohydric or polyhydric alcohol.
References Cited (Backward Citations)
US3628988A
Cited
US4134930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |