US2825641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for melting refractory metals for casting purposes
Assignee: Individual
•
Filing: 1955-09-21
•
Granted: 1958-03-04
•
Expires: 1975-09-21
Abstract
No abstract record available.
Inventors
- 👤 Robert A Beall
- 👤 John O Borg
- 👤 Henry L Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:15
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/32; H01J37/32009; H01J37/32055; C; C22; C22B; C22B4/00; C22C; C22C14/00; C22C16/00; Y; Y10; Y10S; Y10S266/00; Y10S266/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A METHOD FOR INCREASING THE RATE OF MELTING A REFRACTORY METAL TAKEN FROM THE GROUP CONSISTING OF TITANIUM AND ZIRCONIUM COMPRISING THE STEPS OF MELTING THE REFRACTORY METAL AS A CONSUMABLE ELECTRODE IN AN ELECTRIC ARC FURNACE, EVACUATING THE FURNACE ATMOSPHERE UNTIL THE OCCURENCE OF GLOW DISCHARGE THEREIN, INCREASING THE POWER INPUT TO THE FURNACE WHILE MAINTAINING THTE EXISTING DEGREE OF VACUUM THEREIN UNTIL THE GLOW DISCHARGE DISAPPEARS, THEREAFTER UTILIZING EACH OCCURENCE OF GLOW DISCHARGE AS A SIGNAL TO DECREASE THE RATE OF FURNACE EVACUATION UNTIL THE GLOW DISCHARGE DISAPPEARS, AND INCREASING THE POWER INPUT TO THE FURNACE SIMULTANEOUSLY WITH THE DECREASE IN THE RATE OF EVACUATION TO MINIMIZE THE PERIODS OF VISIBLE GLOW DISCHARGE.
Claim 2
Independent Claim
115 words
A METHOD FOR INCREASING THE RATE OF MELTING A REFRACTORY METAL TAKEN FROM THE GROUP CONSISTING OF TITANIUM AND ZIRCONIUM COMPRISING THE STEPS OF MELTING THE REFRACTORY METAL AS A CONSUMABLE ELECTRODE IN AN ELECTRIC ARC FURNACE, EVACUATING THE FURNACE ATMOSPHERE UNTIL THE OCCURENCE OF GLOW DISCHARGE THEREIN, INCREASING THE POWER INPUT TO THE FURNACE WHILE MAINTAINING THTE EXISTING DEGREE OF VACUUM THEREIN UNTIL THE GLOW DISCHARGE DISAPPEARS, THEREAFTER UTILIZING EACH OCCURENCE OF GLOW DISCHARGE AS A SIGNAL TO DECREASE THE RATE OF FURNACE EVACUATION UNTIL THE GLOW DISCHARGE DISAPPEARS, AND INCREASING THE POWER INPUT TO THE FURNACE SIMULTANEOUSLY WITH THE DECREASE IN THE RATE OF EVACUATION TO MINIMIZE THE PERIODS OF VISIBLE GLOW DISCHARGE.
References Cited (Backward Citations)
US873958A
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US2310635A
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US2554902A
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US2541764A
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US2686822A
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US2727937A
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US2727936A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |