Patent US3303030A successfully refreshed from Google Patents.
US3303030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory mold
Assignee: Dentists Supply Company of New York
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Filing: 1963-06-20
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Granted: 1967-02-07
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Expires: 1983-06-20
Abstract
No abstract record available.
Inventors
- 👤 Jerome A Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:21
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/18; B22C1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A COMPOSITION CONSISTING ESSENTIALLY OF ABOUT 65 PARTS OF A REFRACTORY SELECTED FROM THE GROUP CONSISTING OF FUSED QUARTZ, ZIRCONIUM OXIDE, ZIRCONIUM SILICATE, MULLITE, SILLIMANITE, SILICON CARBIDE, TITANIUM DIOXIDE, REFRACTORY ALUMINUM OXIDE, SILICA, CRISTOBALITE, TRIDIMITE, AND MIXTURES THEREOF, FROM ABOUT 15 TO ABOUT 50 PARTS OF FINELY GROUND CALCIUM SULFATE HEMIHYDRATE, SUBSTANTIALLY ALL OF SAID HEMIHYDRATE BEING FINER THAN 200 MESH, FROM ABOUT 0.1 TO ABOUT 5.0 PARTS OF A HIGH TEMPERATURE REDUCING AGENT WHICH PROVIDES A REDUCING ATMOSPHERE AT TEMPERATURES ABOVE ABOUT 1000* FAHRENHEIT, AND FROM ABOUT 0.02 TO ABOUT 3.0 PARTS OF AN ALKALI METAL ARSENITE.
Claim 2
Dependent Claim
98 words
A COMPOSITION CONSISTING ESSENTIALLY OF ABOUT 65 PARTS OF A REFRACTORY SELECTED FROM THE GROUP CONSISTING OF FUSED QUARTZ, ZIRCONIUM OXIDE, ZIRCONIUM SILICATE, MULLITE, SILLIMANITE, SILICON CARBIDE, TITANIUM DIOXIDE, REFRACTORY ALUMINUM OXIDE, SILICA, CRISTOBALITE, TRIDIMITE, AND MIXTURES THEREOF, FROM ABOUT 15 TO ABOUT 50 PARTS OF FINELY GROUND CALCIUM SULFATE HEMIHYDRATE, SUBSTANTIALLY ALL OF SAID HEMIHYDRATE BEING FINER THAN 200 MESH, FROM ABOUT 0.1 TO ABOUT 5.0 PARTS OF A HIGH TEMPERATURE REDUCING AGENT WHICH PROVIDES A REDUCING ATMOSPHERE AT TEMPERATURES ABOVE ABOUT 1000* FAHRENHEIT, AND FROM ABOUT 0.02 TO ABOUT 3.0 PARTS OF AN ALKALI METAL ARSENITE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |