Patent JPH06197899A successfully refreshed from Google Patents.
Patent US4743417A successfully refreshed from Google Patents.
USRE29093E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tabletting spherical dental amalgam alloy
Assignee: Manufacturers Hanover Trust Co
•
Filing: 1976-04-12
•
Granted: 1976-12-28
•
Expires: 1996-04-12
Abstract
Abstract A process is provided for tabletting spherical dental amalgam alloy. The process comprises treating the particles of spherical alloy by contacting them with a hydrochloric acid solution of cupric chloride, separating the acidic cupric chloride solution from the spherical alloy particles, washing the spherical alloy particles with water, drying the spherical alloy particles to remove residual water and then compacting the treated spherical alloy particles into a solid form such as a tablet.
Inventors
- 👤 Charles Francis Burns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:52
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/847; B; B22; B22F; B22F1/00; B22F1/17; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12181
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
168 words
The process for treating spherical alloy particles to enable them to be tabletted in a compacting press comprising: contacting spherical dental amalgam alloy particles .Iadd. having a composition within the range of 59.1 to 59.7% silver, 26.5 to 27.6% tin, 12.9 to 14.3% copper and 0.01 to 0.05% zinc .Iaddend.with a hydrochloric acid solution of cupric chloride for a time sufficient to react with the alloy surface and grow cubical crystals containing copper thereon said hydrochloric acid ranging in concentration from about 10 volume percent to about 30 volume percent concentrated hydrochloric acid and said cupric chloride ranging in concentration from about 0.1 grams to about 1 gram per 100 milliliters of hydrochloric acid solution; separating the hydrochloric acid solution of cupric chloride from the spherical alloy particles; washing the separated spherical alloy particles with water to remove the residual hydrochloric acid solution of cupric chloride; drying the washed spherical alloy particles to remove residual water; and finally compacting the dried spherical alloy particles into a solid form.
Claim 2
Dependent Claim
168 words
The process for treating spherical alloy particles to enable them to be tabletted in a compacting press comprising: contacting spherical dental amalgam alloy particles .Iadd. having a composition within the range of 59.1 to 59.7% silver, 26.5 to 27.6% tin, 12.9 to 14.3% copper and 0.01 to 0.05% zinc .Iaddend.with a hydrochloric acid solution of cupric chloride for a time sufficient to react with the alloy surface and grow cubical crystals containing copper thereon said hydrochloric acid ranging in concentration from about 10 volume percent to about 30 volume percent concentrated hydrochloric acid and said cupric chloride ranging in concentration from about 0.1 grams to about 1 gram per 100 milliliters of hydrochloric acid solution; separating the hydrochloric acid solution of cupric chloride from the spherical alloy particles; washing the separated spherical alloy particles with water to remove the residual hydrochloric acid solution of cupric chloride; drying the washed spherical alloy particles to remove residual water; and finally compacting the dried spherical alloy particles into a solid form.
Claim 3
Dependent Claim
26 words
The process of claim 1 in which the compacting is done by a tabletting machine. .[.3. The process of claim 1 in which the spherical alloy
Claim 4
Dependent Claim
38 words
particles are a silver, tin, copper and zinc alloy..]. 4. The process of claim 1 in which the hydrochloric acid solution of cupric chloride is in contact with the spherical alloy particles for a period ranging from about
Claim 5
Dependent Claim
177 words
10 minutes to about 40 minutes. 5. The process for treating spherical alloy particles to enable them to be tabletted in a compacting press comprising: contacting spherical dental amalgam alloy particles .Iadd. having a composition within the range of 59.1 to 59.7% silver, 26.5 to 27.6% tin, 12.9 to 14.3% copper and 0.01 to 0.05% zinc .Iaddend.with a hydrochloric acid solution of cupric chloride for a time sufficient to react with the alloy surface and grow crystals containing copper thereon said hydrochloric acid ranging in concentration from about 10 volume percent to about 30 volume percent concentrated hydrochloric acid and said cupric chloride ranging in concentration from about 0.1 grams to about 1 gram per 100 milliliters of hydrochloric acid solution; separating the hydrochloric acid solution of cupric chloride from the spherical alloy particles; washing the separated spherical alloy particles with water to remove the residual hydrochloric acid solution of cupric chloride; and drying the washed spherical alloy particles to remove residual water. .[.6. The process of claim 5 in which the spherical alloy particles are a
Claim 6
Dependent Claim
41 words
silver, tin, copper and zinc alloy..]. 7. The process of claim 5 in which the hydrochloric acid solution of cupric chloride is in contact with the spherical alloy particles for a period ranging from about 10 minutes to about 40 minutes.
References Cited (Backward Citations)
US1803386A
Cited
US3574607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |