US5049190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Primer composition for dental metal/plastic composite structure
Assignee: Kulzer GmbH
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Filing: 1989-10-24
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Granted: 1991-09-17
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Expires: 2009-10-24
Abstract
Abstract Firmly adhering, durable dental metal/plastic composite structures that are stable in the presence of moisture can be made from dental alloys and plastics, if an adhesion promoting layer having a concentration gradient and comprising silicon dioxide and metal oxide, particularly chromium oxide, is disposed between them.
Inventors
- 👤 Roland Gobel
- 👤 Hans-Jurgen Tiller
- 👤 Rudolf Musil
- 👤 Dieter Schodel
- 👤 Albert Schmidt
- 👤 Brigitte Magnus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:48
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/802
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A composition for producing a dental metal/plastic composite structure having an adhesion promoting layer containing silicon dioxide and disposed between the metal and the plastic, said composition being capable to produce an adhesion promoting layer having a concentration gradient of metal oxide and comprising (a) a colloidal dispersion of silicon dioxide, (b) an acidic hydrolyzate of an alkoxysilane for cross-linking the silicon dioxide, and (c) one or more metal oxide forming components wherein the silicon content of (b) is 10 -5 to 1% by weight, the silicon content of the composition is 10 -3 to 10% by weight; and the metal content of the composition is 10 -4 to 1% by weight.
Claim 2
Dependent Claim
112 words
A composition for producing a dental metal/plastic composite structure having an adhesion promoting layer containing silicon dioxide and disposed between the metal and the plastic, said composition being capable to produce an adhesion promoting layer having a concentration gradient of metal oxide and comprising (a) a colloidal dispersion of silicon dioxide, (b) an acidic hydrolyzate of an alkoxysilane for cross-linking the silicon dioxide, and (c) one or more metal oxide forming components wherein the silicon content of (b) is 10 -5 to 1% by weight, the silicon content of the composition is 10 -3 to 10% by weight; and the metal content of the composition is 10 -4 to 1% by weight.
Claim 3
Dependent Claim
18 words
A composition of claim 1, wherein the alkoxysilane is tetraalkoxysilane wherein the alkoxy groups have 1-6 carbon atoms.
Claim 4
Dependent Claim
17 words
A composition of claim 1, wherein the component cross-linking the silicon dioxide is contained in the dispersion.
Claim 5
Dependent Claim
18 words
A composition of claim 1, wherein the metal oxide forming component is a chromium, vanadium or manganese compound.
Claim 6
Dependent Claim
13 words
A composition of claim 4, wherein the compound is dissolved in a solvent.
Claim 7
Dependent Claim
12 words
A composition of claim 4, wherein the compound is a chromium compound.
Claim 8
Dependent Claim
11 words
A composition of claim 1, further comprising water and/or an alkanol.
Claim 9
Dependent Claim
22 words
A composition of claim 7, further comprising a wetting agent in a quantity of from 0.05 to 0.25% of the total volume.
References Cited (Backward Citations)
US4364731A
Cited
US4933202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-16 | 1995-03-18 | 1995-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-16 | 1999-03-18 | 1999-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-16 | 2003-03-18 | 2003-09-17 | $7700.00 | Window Closed / Lapsed |