Patent US3250893A successfully refreshed from Google Patents.
US3250893A
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Method for providing a source of heat
Assignee: Union Carbide Corp
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Filing: 1963-10-01
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Granted: 1966-05-10
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Expires: 1983-10-01
Abstract
No abstract record available.
Inventors
- 👤 Ontario H Nestor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:02
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34; H05H1/3421; H05H1/3494
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A METHOD FOR PROVIDING AN ARC HEAT SOURCE WHICH COMPRISES HEATING ONE SIDE OF A CATHODE MATERIAL TO CAUSE ELECTRON EMISSION FROM ANOTHER SIDE OF SAID CATHODE MATERIAL; ESTABLISHING AN ARC BETWEEN SAID OTHER SIDE OF THE CATHODE MATERIAL AND A WORKPIECE ELECTRODE INTRODUCING A GAS INTO SAID ARC TO PROVIDE AN ARC PLASMA, THE PLASMA TO CATHODE CONTACT AREA OF THE ARC BEING DETERMINED BY THE AREA OF ELECTRON EMISSION FROM THE OTHER SIDE OF SAID CATHODE MATERIAL.
Claim 2
Independent Claim
79 words
A METHOD FOR PROVIDING AN ARC HEAT SOURCE WHICH COMPRISES HEATING ONE SIDE OF A CATHODE MATERIAL TO CAUSE ELECTRON EMISSION FROM ANOTHER SIDE OF SAID CATHODE MATERIAL; ESTABLISHING AN ARC BETWEEN SAID OTHER SIDE OF THE CATHODE MATERIAL AND A WORKPIECE ELECTRODE INTRODUCING A GAS INTO SAID ARC TO PROVIDE AN ARC PLASMA, THE PLASMA TO CATHODE CONTACT AREA OF THE ARC BEING DETERMINED BY THE AREA OF ELECTRON EMISSION FROM THE OTHER SIDE OF SAID CATHODE MATERIAL.
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) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |