Patent US2952573A successfully refreshed from Google Patents.
US2952573A
Expired / Lapsed
US
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Carbide coated tungsten electrode
Assignee: National Research Corp
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Filing: 1957-05-31
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Granted: 1960-09-13
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Expires: 1977-05-31
Abstract
No abstract record available.
Inventors
- 👤 Maurice L Torti Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:34
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; H05B7/10; H05B7/103; H05B7/105; C; C23; C23C; C23C8/00; C23C8/60; C23C8/62; C23C8/64; F; F27; F27B; F27B5/00; F27B5/04; H05B7/06; H05B7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
AN ARC MELTING ELECTRODE IN A VACUUM FURNACE IN WHICH THE MELTING CONDITION REQUIRES AN ARC OF A DENSITY OF AT LEAST 50 AMPS./CM.2, WHICH ELECTRODE IS MADE OF A MIXTURE OF TUNGSTEN AND A MATERIAL HAVILNG ELECTRON EMISSION CHARACTERISTICS SUBSTANTIALLY GREATER THAN THAT OF TUNGSTEN AT TEMPERATURES IN THE RANGE OF ABOUT 2500* TO 3000*K., SAID ELECTRODE HAVING PROVIDED ON THE SURFACE THEREOF A THIN HEAT RESISTANT LAYER OF A CARBIDE WHICH ACTS AS AN INHIBITOR AGAINST THE EVAPORATION OF THE MATERIAL HAVING HIGH ELECTRON EMISSION CHARACTERISTICS.
Claim 2
Dependent Claim
88 words
AN ARC MELTING ELECTRODE IN A VACUUM FURNACE IN WHICH THE MELTING CONDITION REQUIRES AN ARC OF A DENSITY OF AT LEAST 50 AMPS./CM.2, WHICH ELECTRODE IS MADE OF A MIXTURE OF TUNGSTEN AND A MATERIAL HAVILNG ELECTRON EMISSION CHARACTERISTICS SUBSTANTIALLY GREATER THAN THAT OF TUNGSTEN AT TEMPERATURES IN THE RANGE OF ABOUT 2500* TO 3000*K., SAID ELECTRODE HAVING PROVIDED ON THE SURFACE THEREOF A THIN HEAT RESISTANT LAYER OF A CARBIDE WHICH ACTS AS AN INHIBITOR AGAINST THE EVAPORATION OF THE MATERIAL HAVING HIGH ELECTRON EMISSION CHARACTERISTICS.
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) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |