US3209114A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable inductance device for control of power in an induction heating apparatus
Assignee: Ohio Crankshaft Co
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Filing: 1962-08-01
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Granted: 1965-09-28
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Expires: 1982-08-01
Abstract
No abstract record available.
Inventors
- 👤 Edward F Mcbrien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:21
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
IN AN INDUCTION HEATING APPARATUS INCLUDING A HIGH FREQUENCY POWER SOURCE, AN INDUCTIVE LOAD CONNECTED TO SAID POWER SOURCE AND MEANS FOR COMPENSATING FOR VARIATIONS IN THE INDUCTIVE REACTANCE OF SAID LOAD, THE IMPROVEMENT COMPRISING: SAID COMPENSATING MEANS BEING SUBSTANTIALLY LINEAR IN OPERATION AND COMPRISING A FIRST AND SECOND COIL CONNECTED IN ELECTRICAL SERIES, SAID FIRST COIL HAVING AN AXIAL OPENING AND MEANS FOR PROGRESSIVELY MOVING SAID SECOND COIL AXIALLY INTO AND OUT OF SAID OPENING TO CONTROL THE INDUCTANCE ACROSS SAID TWO ENDS, SAID TWO COILS BEING ELECTRICALLY CONNECTED WITH SAID INDUCTIVE LOAD TO CHANGE THE EFFECTIVE INDUCTANCE OF SAID LOAD AS SAID SECOND COIL IS MOVED WITH RESPECT TO SAID FIRST COIL.
Claim 2
Dependent Claim
114 words
IN AN INDUCTION HEATING APPARATUS INCLUDING A HIGH FREQUENCY POWER SOURCE, AN INDUCTIVE LOAD CONNECTED TO SAID POWER SOURCE AND MEANS FOR COMPENSATING FOR VARIATIONS IN THE INDUCTIVE REACTANCE OF SAID LOAD, THE IMPROVEMENT COMPRISING: SAID COMPENSATING MEANS BEING SUBSTANTIALLY LINEAR IN OPERATION AND COMPRISING A FIRST AND SECOND COIL CONNECTED IN ELECTRICAL SERIES, SAID FIRST COIL HAVING AN AXIAL OPENING AND MEANS FOR PROGRESSIVELY MOVING SAID SECOND COIL AXIALLY INTO AND OUT OF SAID OPENING TO CONTROL THE INDUCTANCE ACROSS SAID TWO ENDS, SAID TWO COILS BEING ELECTRICALLY CONNECTED WITH SAID INDUCTIVE LOAD TO CHANGE THE EFFECTIVE INDUCTANCE OF SAID LOAD AS SAID SECOND COIL IS MOVED WITH RESPECT TO SAID FIRST COIL.
References Cited (Backward Citations)
US1948704A
Cited
US2141573A
Cited
GB482756A
Cited
US2334178A
Cited
US2604575A
Cited
US2856499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |