US3331909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for energizing an induction melting furnace with a three phase electrical network
Assignee: Ohio Crankshaft Co
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Filing: 1965-03-12
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Granted: 1967-07-18
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Expires: 1985-03-12
Abstract
No abstract record available.
Inventors
- 👤 Robert J Kasper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:06
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/06; H05B6/067
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
IN THE COMBINATION OF A CORELESS INDUCTION MELTING FURNACE HAVING A HEATING COIL AND A METAL RECEIVING CHAMBER COTERMINOUS WITH SAID COIL, AND A THREE PHASE NETWORK FOR ENERGIZING SAID COIL, THE IMPROVEMENT COMPRISING: SAID HEATING COIL BEING INDIVIDED INTO AN ACTIVE MELTING SECTION AND AN INACTIVE, NON-MELTING SECTION, A TUNING CAPACITOR BEING CONNECTED ACROSS SAID ACTIVE, MELTING SECTION, SAID INACTIVE NON-MELTING SECTION BEING UNTUNED TO EXHIBIT AN INDUCTIVE, SUBSTANTIALLY WATTLESS LOAD, SAID TUNED ACTIVE MELTING SECTION OF SAID COIL BEING CONNECTED IN A FIRST PHASE OF SAID THREE PHASE NETWORK, AND SAID UNTUNED INACTIVE, NON-MELTING SECTION BEING CONNECTED IN A SECTION PHASE OF SAID THREE PHASE NETWORK.
Claim 2
Dependent Claim
108 words
IN THE COMBINATION OF A CORELESS INDUCTION MELTING FURNACE HAVING A HEATING COIL AND A METAL RECEIVING CHAMBER COTERMINOUS WITH SAID COIL, AND A THREE PHASE NETWORK FOR ENERGIZING SAID COIL, THE IMPROVEMENT COMPRISING: SAID HEATING COIL BEING INDIVIDED INTO AN ACTIVE MELTING SECTION AND AN INACTIVE, NON-MELTING SECTION, A TUNING CAPACITOR BEING CONNECTED ACROSS SAID ACTIVE, MELTING SECTION, SAID INACTIVE NON-MELTING SECTION BEING UNTUNED TO EXHIBIT AN INDUCTIVE, SUBSTANTIALLY WATTLESS LOAD, SAID TUNED ACTIVE MELTING SECTION OF SAID COIL BEING CONNECTED IN A FIRST PHASE OF SAID THREE PHASE NETWORK, AND SAID UNTUNED INACTIVE, NON-MELTING SECTION BEING CONNECTED IN A SECTION PHASE OF SAID THREE PHASE NETWORK.
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) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |