Patent US3305356A successfully refreshed from Google Patents.
US3305356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental amalgam
Assignee: Individual
•
Filing: 1963-10-31
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Granted: 1967-02-21
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Expires: 1983-10-31
Abstract
No abstract record available.
Inventors
- 👤 William V Youdelis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:05
CPC Classifications
C; C22; C22C; C22C7/00; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/847
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A DENTAL AMALGAM HAVING A COMPRESSIVE STRENGTH OF ABOUT 60,000 TO 65,000 P.S.I.G., A HARDNESS OF ABOUT 110 TO 115 D.P.H. AND A FLOW OF ABOUT 0.5 TO 2% IN 21 HOURS, SAID AMALGAM CONSISTING ESSENTIALLY OF: (A) ABOUT 30 TO 45% OF AN AMALGAMATABLE ALLOY CONSISTING ESSENTIALLY OF 75% BY WEIGHT SILVER AND 25% BY WEIGHT OF TIN, SAID ALLOY HAVING UP TO 7% BY WEIGHT OF THE SILVER-TIN ALLOY REPLACED BY UP TO 5% BY WEIGHT OF COPPER AND UP TO 2% BY WEIGHT OF ZINC; (B) ABOUT 5 TO 25% BY WEIGHT OF DISCRETE PARTICLES OF A SUBSTANTIALLY NON-AMALGAMATABLE ALLOY CONTAINING AT LEAST 50% BY WEIGHT OF SILVER, SAID ALLOY (B) BEING OF SUBSTANTIALLY DIFFERENT CHEMICAL COMPOSITION FROM SAID ALLOY (A), SAID ALLOY BEING PRESENT AS A DISPERSION PHASE IN THE AMALGAM MATRIX AND SAID ALLOY BEING IN THE FORM OF DISCRETE PARTICLES REMAINING ESSENTIALLY WHOLLY INTACT IN THE SET AMALGAM; AND (C) ABOUT 40% TO 60% BY WEIGHT OF MERCURY.
Claim 2
Dependent Claim
164 words
A DENTAL AMALGAM HAVING A COMPRESSIVE STRENGTH OF ABOUT 60,000 TO 65,000 P.S.I.G., A HARDNESS OF ABOUT 110 TO 115 D.P.H. AND A FLOW OF ABOUT 0.5 TO 2% IN 21 HOURS, SAID AMALGAM CONSISTING ESSENTIALLY OF: (A) ABOUT 30 TO 45% OF AN AMALGAMATABLE ALLOY CONSISTING ESSENTIALLY OF 75% BY WEIGHT SILVER AND 25% BY WEIGHT OF TIN, SAID ALLOY HAVING UP TO 7% BY WEIGHT OF THE SILVER-TIN ALLOY REPLACED BY UP TO 5% BY WEIGHT OF COPPER AND UP TO 2% BY WEIGHT OF ZINC; (B) ABOUT 5 TO 25% BY WEIGHT OF DISCRETE PARTICLES OF A SUBSTANTIALLY NON-AMALGAMATABLE ALLOY CONTAINING AT LEAST 50% BY WEIGHT OF SILVER, SAID ALLOY (B) BEING OF SUBSTANTIALLY DIFFERENT CHEMICAL COMPOSITION FROM SAID ALLOY (A), SAID ALLOY BEING PRESENT AS A DISPERSION PHASE IN THE AMALGAM MATRIX AND SAID ALLOY BEING IN THE FORM OF DISCRETE PARTICLES REMAINING ESSENTIALLY WHOLLY INTACT IN THE SET AMALGAM; AND (C) ABOUT 40% TO 60% BY WEIGHT OF MERCURY.
References Cited (Backward Citations)
US2271264A
Cited
US2698231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |