Patent US2789152A successfully refreshed from Google Patents.
US2789152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric furnace for production of metals
Assignee: National Research Corp
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Filing: 1955-06-01
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Granted: 1957-04-16
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Expires: 1975-06-01
Abstract
No abstract record available.
Inventors
- 👤 John L Ham
- 👤 David I Sinizer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:11
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/52; F; F27; F27D; F27D11/00; F27D11/08; H; H05; H05B; H05B7/00; H05B7/18; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A FURNACE FOR SKULL MELTING TITANIUM AND LIKE REFRACTORY METALS, THE FURNACE COMPRISING A VACUUM-TIGHT HOUSING, MEANS FOR EVACUATING THE HOUSING, A CRUCIBLE FOR HOLDING MASS OF METAL TO BE MELTED, A RADIATION SHIELD OVER THE CRUCIBLE, AN ELECTRODE UNITARY MASSIVE ELECTRODE SUPPORT METAL, AN ELONGATED UNITARY MASSIVE ELECTRODE SUPPORT EXTENDING THROUGH A VACUUM-TIGHT SEAL CARRIED BY SAID HOUSING, SAID ELECTRODE SUPPORT ALSO EXTENDING THROUGH SAID RADIATION SHIELD, A WATER PASSAGE EXTENDING DOWN SAID ELECTRODE SUPPORT SUBSTANTIALLY AT THE AXIS THEREOF, SAID ELECTRODE BEING SECURED TO THE LOWER END OF SAID SUPPORT, THE END OF THE WATER PASSAGE IN THE ELECTRODE SUPPORT BEING AT LEAST FIVE INCHES FROM THE ELECTRODE, THE WALL OF THE ELECTRODE SUPPORT DEFINING THE WATER PASSAGE ADJACENT ITS LOWER END BEING AT LEAST ONE INCH IN THICKNESS.
Claim 2
Dependent Claim
131 words
A FURNACE FOR SKULL MELTING TITANIUM AND LIKE REFRACTORY METALS, THE FURNACE COMPRISING A VACUUM-TIGHT HOUSING, MEANS FOR EVACUATING THE HOUSING, A CRUCIBLE FOR HOLDING MASS OF METAL TO BE MELTED, A RADIATION SHIELD OVER THE CRUCIBLE, AN ELECTRODE UNITARY MASSIVE ELECTRODE SUPPORT METAL, AN ELONGATED UNITARY MASSIVE ELECTRODE SUPPORT EXTENDING THROUGH A VACUUM-TIGHT SEAL CARRIED BY SAID HOUSING, SAID ELECTRODE SUPPORT ALSO EXTENDING THROUGH SAID RADIATION SHIELD, A WATER PASSAGE EXTENDING DOWN SAID ELECTRODE SUPPORT SUBSTANTIALLY AT THE AXIS THEREOF, SAID ELECTRODE BEING SECURED TO THE LOWER END OF SAID SUPPORT, THE END OF THE WATER PASSAGE IN THE ELECTRODE SUPPORT BEING AT LEAST FIVE INCHES FROM THE ELECTRODE, THE WALL OF THE ELECTRODE SUPPORT DEFINING THE WATER PASSAGE ADJACENT ITS LOWER END BEING AT LEAST ONE INCH IN THICKNESS.
References Cited (Backward Citations)
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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) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |