Patent US4894590A successfully refreshed from Google Patents.
Patent US2674571A successfully refreshed from Google Patents.
US2674571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of electropolishing dental appliances
Assignee: Nobilium Processing Inc
•
Filing: 1951-07-06
•
Granted: 1954-04-06
•
Expires: 1971-07-06
Abstract
No abstract record available.
Inventors
- 👤 Emil M Prosen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:06
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/16; C25F3/22; A; A61; A61C; A61C3/00; A61C3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
THE METHOD OF ELECTROPOLISHING A DENTAL APPLIANCE COMPRISING AN ALLOY HAVING THE FOLLOWING COMPOSITION: BETWEEN ABOUT 60 AND ABOUT 65%, BY WEIGHT, OF COBALT, BETWEEN ABOUT 27% AND ABOUT 32%, BY WEIGHT, OF CHROMIUM, AND BETWEEN ABOUT 2% AND ABOUT 6%, BY WEIGHT, OF MOLYBDENUM, WHICH COMPRISES IMMERSING, AS ANODE, SAID DENTAL APPLIANCE IN AN ELECTROLYTE BATH CONSISTING ESSENTIALLY OF BETWEEN ABOUT 5% AND ABOUT 22% OF H2SO4, BETWEEN ABOUT 0.25% AND ABOUT 5% OF HC1, BETWEEN ABOUT 70% AND ABOUT 84% OF ETHYLENE GLYCOL AND LESS THAN ABOUT 8% WATER; AND PRODUCING AN ELECTRIC CURRENT FLOW BETWEEN SAID DENTAL APPLIANCE AND AN ASSOCIATED CATHODE.
Claim 2
Independent Claim
105 words
THE METHOD OF ELECTROPOLISHING A DENTAL APPLIANCE COMPRISING AN ALLOY HAVING THE FOLLOWING COMPOSITION: BETWEEN ABOUT 60 AND ABOUT 65%, BY WEIGHT, OF COBALT, BETWEEN ABOUT 27% AND ABOUT 32%, BY WEIGHT, OF CHROMIUM, AND BETWEEN ABOUT 2% AND ABOUT 6%, BY WEIGHT, OF MOLYBDENUM, WHICH COMPRISES IMMERSING, AS ANODE, SAID DENTAL APPLIANCE IN AN ELECTROLYTE BATH CONSISTING ESSENTIALLY OF BETWEEN ABOUT 5% AND ABOUT 22% OF H2SO4, BETWEEN ABOUT 0.25% AND ABOUT 5% OF HC1, BETWEEN ABOUT 70% AND ABOUT 84% OF ETHYLENE GLYCOL AND LESS THAN ABOUT 8% WATER; AND PRODUCING AN ELECTRIC CURRENT FLOW BETWEEN SAID DENTAL APPLIANCE AND AN ASSOCIATED CATHODE.
References Cited (Backward Citations)
US2334698A
Cited
US2315695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-05 | 1957-10-05 | 1958-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-05 | 1961-10-05 | 1962-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-05 | 1965-10-05 | 1966-04-06 | $7700.00 | Window Closed / Lapsed |