US3081989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction heating coil
Assignee: Ohio Crankshaft Co
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Filing: 1960-04-20
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Granted: 1963-03-19
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Expires: 1980-04-20
Abstract
No abstract record available.
Inventors
- 👤 Edward F Mcbrien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:51
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/42; C; C21; C21D; C21D1/00; C21D1/34; C21D1/42; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
149 words
AN INDUCTION COIL COMPRISING A CONTINUOUS LENGTH OF SOLID ELECTRICALLY CONDUCTIVE STRIP MATERIAL HAVING A WIDTH MANY TIMES ITS THICKNESS AND WOUND IN A SPIRAL CONFIGURATION IN WHICH THE LONG TRANSVERSE SIDES OF THE STRIP MATERIAL IN SUCCESSIVE TURNS OF THE SPIRAL FACE EACH OTHER, CONTINUOUS LENGTHS OF INSULATING MATERIAL DISPOSED BETWEEN THE TURNS OF THE SPIRAL AT THE OPPOSITE EDGES OF THE STRIP MATERIAL AND AT THE CENTER THEREOF TO PROVIDE TWO CONTINUOUS PASSAGEWAYS BETWEEN THE TURNS, SPACED OPENINGS IN THE CONTINUOUS LENGTH OF INSULATING MATERIAL AT THE EDGE OF THE STRIP MATERIAL WHICH DEFINES THE INNER PERIPHERY OF THE COIL, MEANS FOR INJECTING A QUENCHING FLUID INTO THE PASSAGEWAY COMMUNICATING WITH SAID OPENINGS WHEREBY THE QUENCHING FLUID MAY PASS THROUGH THE OPENINGS AND ON TO THE SURFACE OF A WORKPIECE DISPOSED WITHIN THE COIL, AND CONNECTIONS FOR CONDUCTING A COOLING FLUID THROUGH THE OTHER OF SAID PASSAGEWAYS.
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) | 1966-03-18 | 1966-09-17 | 1967-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-18 | 1970-09-17 | 1971-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-18 | 1974-09-17 | 1975-03-19 | $7700.00 | Window Closed / Lapsed |