US4557691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental porcelain paste and method of using the same
Assignee: Dentsply Sirona Inc
•
Filing: 1984-08-20
•
Granted: 1985-12-10
•
Expires: 2004-08-20
Abstract
Abstract A porcelain paste comprising a porcelain powder mixed with an aqueous colloidal dispersion of a urethane polymer. The paste can be applied as the first layer to a dental coping, and does not need to be fired prior to the addition of the body porcelain layers.
Inventors
- 👤 Brain Martin
- 👤 Carlino Panzera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:30
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/802; A61K6/884; A61K6/891; A61K6/893; Y; Y10; Y10S; Y10S528/00; Y10S528/92
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A paste suitable for applying to a metal or ceramic dental base as a porcelain layer, which layer does not need to be fired prior to addition of a body porcelain layer, which paste comprises a porcelain powder and an aqueous colloidal dispersion of a urethane polymer, wherein said urethane polymer contains carboxyl groups, and wherein the carboxyl groups are neutralized with alkali metal, ammonia, or amine.
Claim 2
Dependent Claim
67 words
A paste suitable for applying to a metal or ceramic dental base as a porcelain layer, which layer does not need to be fired prior to addition of a body porcelain layer, which paste comprises a porcelain powder and an aqueous colloidal dispersion of a urethane polymer, wherein said urethane polymer contains carboxyl groups, and wherein the carboxyl groups are neutralized with alkali metal, ammonia, or amine.
Claim 3
Dependent Claim
26 words
The paste of claim 1 wherein the aqueous phase contains an anion that forms a salt with calcium or barium that has low solubility in water.
Claim 4
Dependent Claim
15 words
The paste of claim 2 wherein said anion is phosphate, oxalate, or a mixture thereof.
Claim 5
Dependent Claim
19 words
The paste of claim 1 wherein said paste contains a small amount of a suspending agent and a dispersant.
Claim 6
Dependent Claim
14 words
The paste of claim 1 wherein the porcelain powder is an opaque porcelain powder.
Claim 7
Dependent Claim
13 words
The paste of claim 1 wherein the porcelain powder is a porcelain stain.
Claim 8
Dependent Claim
13 words
The paste of claim 1 wherein the porcelain powder is a dentino porcelain.
Claim 9
Dependent Claim
12 words
A package comprising the paste of claim 1 in a suitable applicator/container.
References Cited (Backward Citations)
US2792628A
Cited
US3412054A
Cited
US4264640A
Cited
US4329490A
Cited
US4250277A
Cited
US4347174A
Cited
US4469477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |