Patent US2819158A successfully refreshed from Google Patents.
US2819158A
Expired / Lapsed
US
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Method of arc-melting titanium
Assignee: Individual
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Filing: 1953-08-07
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Granted: 1958-01-07
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Expires: 1973-08-07
Abstract
No abstract record available.
Inventors
- 👤 James H Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:49
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1295; C22B4/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A METHOD OF ARC-MELTING TITANIUM AND ALLOYS THEREOF TO PRODUCE AN INGOT HAVING A CORE SUBSTANTIALLY FREE OF ATMOSPHERIC CONTAMINANTS SUCH AS OXYGEN, COMPRISING THE STEPS OF, GENERATING AN ARC BETWEEN A SMALL QUANTITY OF TITANIUM AND A CONSUMABLE ELECTRODE TO FORM A MOLTEN POOL, MAINTAINING A SHIELD OF INERT GAS AROUND THE ARC AND POOL, AND FEEDING THE ELECTRODE INTO THE ARC TO MAINTAIN A SUBSTANTIALLY CONSTANT ARC LENGTH AS THE END OF THE ELECTRODE IS MELTED, SAID ELECTRODE CONSISTING PRINCIPALLY OF IMPURE TITANIUM AND CONTAINING AN AMOUNT OF CALCIUM NOT MORE THAN 5 PER CENT BY WEIGHT BUT AT LEAST SUFFICIENT TO SCAVENGE BOTH THE POOL OF METAL AND THE ATMOSPHERE WITHIN THE SHIELD TO REMOVE SAID CONTAMINANTS THEREFROM AS COMPOUNDS OF CALCIUM INSOLUBLE IN MOLTEN TITANIUM.
Claim 2
Independent Claim
129 words
A METHOD OF ARC-MELTING TITANIUM AND ALLOYS THEREOF TO PRODUCE AN INGOT HAVING A CORE SUBSTANTIALLY FREE OF ATMOSPHERIC CONTAMINANTS SUCH AS OXYGEN, COMPRISING THE STEPS OF, GENERATING AN ARC BETWEEN A SMALL QUANTITY OF TITANIUM AND A CONSUMABLE ELECTRODE TO FORM A MOLTEN POOL, MAINTAINING A SHIELD OF INERT GAS AROUND THE ARC AND POOL, AND FEEDING THE ELECTRODE INTO THE ARC TO MAINTAIN A SUBSTANTIALLY CONSTANT ARC LENGTH AS THE END OF THE ELECTRODE IS MELTED, SAID ELECTRODE CONSISTING PRINCIPALLY OF IMPURE TITANIUM AND CONTAINING AN AMOUNT OF CALCIUM NOT MORE THAN 5 PER CENT BY WEIGHT BUT AT LEAST SUFFICIENT TO SCAVENGE BOTH THE POOL OF METAL AND THE ATMOSPHERE WITHIN THE SHIELD TO REMOVE SAID CONTAMINANTS THEREFROM AS COMPOUNDS OF CALCIUM INSOLUBLE IN MOLTEN TITANIUM.
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) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |