US2720577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for and method of heating metal billets by electrical induction
Assignee: Loftus Engineering Corp
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Filing: 1953-08-18
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Granted: 1955-10-11
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Expires: 1973-08-18
Abstract
No abstract record available.
Inventors
- 👤 Robert V Lackner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:40
CPC Classifications
B; B21; B21J; B21J17/00; B21J17/02; H; H01; H01F; H01F30/00; H01F30/06; H01F30/12; H01F30/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
AN INDUCTION FURNACE FOR HEATING METAL BILLETS TO WORKING TEMPERATURE, SAID FURNACE COMPRISING TWO INDUCTION COILS EACH HAVING A WEAR-RESISTANT LINER SECURED WITHIN IT TO FORM A TUBULAR CONTAINER FOR THE BILLETS TO BE HEATED, EACH OF SAID COILS HAVING A TAP ADJACENT TO EACH END OF THE COIL AND AT LEAST ONE ADDITIONAL TAP INTERMEDIATE SAID END TAPS, A SCOTT TRANSFORMER ARRANGEMENT HAVING TWO SECONDARY COILS EACH HAVING TWO TERMINALS, ONE END TERMINAL OF EACH HEATING COIL BEING CONNECTED TO ONE TERMINAL OF ONE OF SAID TRANSFORMER SECONDARY COILS, THE OTHER TERMINAL OF EACH TRANSFORMER SECONDARY COIL BEING CONNECTED TO ONE OF THE OTHER TAPS OF THE HEATING
Claim 2
Dependent Claim
109 words
AN INDUCTION FURNACE FOR HEATING METAL BILLETS TO WORKING TEMPERATURE, SAID FURNACE COMPRISING TWO INDUCTION COILS EACH HAVING A WEAR-RESISTANT LINER SECURED WITHIN IT TO FORM A TUBULAR CONTAINER FOR THE BILLETS TO BE HEATED, EACH OF SAID COILS HAVING A TAP ADJACENT TO EACH END OF THE COIL AND AT LEAST ONE ADDITIONAL TAP INTERMEDIATE SAID END TAPS, A SCOTT TRANSFORMER ARRANGEMENT HAVING TWO SECONDARY COILS EACH HAVING TWO TERMINALS, ONE END TERMINAL OF EACH HEATING COIL BEING CONNECTED TO ONE TERMINAL OF ONE OF SAID TRANSFORMER SECONDARY COILS, THE OTHER TERMINAL OF EACH TRANSFORMER SECONDARY COIL BEING CONNECTED TO ONE OF THE OTHER TAPS OF THE HEATING
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) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |