US4966934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biological compatible adhesive containing a phosphorous adhesion promoter and accelerator
Assignee: Dentsply Research and Development Corp
•
Filing: 1989-06-21
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Granted: 1990-10-30
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Expires: 2009-06-21
Abstract
Abstract A biologically compatible adhesive dental primer that is shelf stable as a single component adhesive and includes a mixture of an adhesive promoting and polymerizable monomer system having a free radical polymerizable monomer or prepolymer having ethylenic unsaturation and a phosphorus containing adhesion promoter which is free from halogen atoms bonded directly to a phosphorus atom, and optionally a free radical polymerization catalyst, and an accelerator for the catalyst.
Inventors
- 👤 Chin-Teh Huang
- 👤 Gordon B. Blackwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:36
CPC Classifications
C; C09; C09J; C09J4/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
37 words
A primer composition for adhering to or coating , hard tissue comprising by weight about (a) 6 to 20% (PENTA) (b) an effective amount of hydroxyethyl methacrylate (HEMA) (c) 0.01-0.5% butylated hydroxytoluene, and (d) an inert solvent.
Claim 2
Dependent Claim
37 words
A primer composition for adhering to or coating , hard tissue comprising by weight about (a) 6 to 20% (PENTA) (b) an effective amount of hydroxyethyl methacrylate (HEMA) (c) 0.01-0.5% butylated hydroxytoluene, and (d) an inert solvent.
Claim 3
Dependent Claim
23 words
The primer composition of claim 1 wherein the inert solvent is selected from the group consisting of acetone, ethylacetate, ethanol and mixtures thereof.
Claim 4
Dependent Claim
13 words
The primer composition of claim 1 wherein the inert solvent is 95% ethanol.
Claim 5
Dependent Claim
13 words
The primer composition of claim 1 wherein the inert solvent is 100% ethanol.
Claim 6
Dependent Claim
17 words
The primer composition of claim 1 which exhibits a bond strength of at least about 2350 psi.
Claim 7
Dependent Claim
10 words
The primer composition of claim 1 which comprises 6% PENTA.
Claim 8
Dependent Claim
10 words
The primer composition of claim 1 which comprises 11% PENTA.
Claim 9
Dependent Claim
10 words
The primer composition of claim 1 which comprises 30% HEMA.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |