US3303258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum induction furnace
Assignee: Otto Junker GmbH
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Filing: 1964-06-15
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Granted: 1967-02-07
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Expires: 1984-06-15
Abstract
No abstract record available.
Inventors
- 👤 Junker Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:53
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/52; C21C5/5241; F; F27; F27B; F27B14/00; F27B14/04; F27B14/06; F27B14/061; F27B5/00; F27B5/04; H; H05; H05B; H05B6/00; H05B6/02; H05B6/22; H05B6/24; H05B6/26; F27B14/08; F27B14/10; F27B14/12; F27B2014/0837; F27B2014/0862; F27B2014/0868; F27D; F27D21/00; F27D21/02; F27D7/00; F27D7/06; Y; Y02; Y02P; Y02P10/00; Y02P10/25; Y10; Y10S; Y10S15/00; Y10S15/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN A CORELESS INDUCTION FURNACE FOR LARGE CAPACITY CHARGES, THE COMBINATION OF, A CRUCIBLE, A PRIMARY INDUCTION COIL ADAPTED TO BE FED FROM AN ELECTRIC SOURCE SURROUNDING SAID CRUCIBLE, VACUUM SEALING MEANS COMPRISING A FURNACE HOUSING, A SLEEVE INCLUDING GAS IMPERMEABLE MATERIAL HAVING LOW ELECTRIC AND MAGNETIC CONDUCTIVITY CHARACTERISTICS DISPOSED BETWEEN SAID COIL AND SAID CRUCIBLE, AND GASTIGHT UPPER AND LOWER CLOSURE MEANS OPERABLE FOR AIRTIGHTLY CLOSING THE UPPER AND, RESPECTIVELY, THE LOWER ENDS OF SAID VACUUM SEALING MEANS AND DEFINING A VACUUM CHAMBER HOUSING SAID CRUCIBLE, AND COOLING MEANS FOR SAID SLEEVE DISPOSED ADJACENT THE INNER SURFACE OF AT LEAST A PORTION OF SAID SLEEVE, SAID COOLING MEANS COMPRISING A SERIES OF HAIR PIN TUBES, EACH TUBE BEING BENT BACK UPON ITSELF AND EXTENDING AXIALLY OF THE CRUCIBLE ADJACENT THE INNER SURFACE OF SAID SLEEVE, EACH TUBE BEING
Claim 2
Dependent Claim
139 words
IN A CORELESS INDUCTION FURNACE FOR LARGE CAPACITY CHARGES, THE COMBINATION OF, A CRUCIBLE, A PRIMARY INDUCTION COIL ADAPTED TO BE FED FROM AN ELECTRIC SOURCE SURROUNDING SAID CRUCIBLE, VACUUM SEALING MEANS COMPRISING A FURNACE HOUSING, A SLEEVE INCLUDING GAS IMPERMEABLE MATERIAL HAVING LOW ELECTRIC AND MAGNETIC CONDUCTIVITY CHARACTERISTICS DISPOSED BETWEEN SAID COIL AND SAID CRUCIBLE, AND GASTIGHT UPPER AND LOWER CLOSURE MEANS OPERABLE FOR AIRTIGHTLY CLOSING THE UPPER AND, RESPECTIVELY, THE LOWER ENDS OF SAID VACUUM SEALING MEANS AND DEFINING A VACUUM CHAMBER HOUSING SAID CRUCIBLE, AND COOLING MEANS FOR SAID SLEEVE DISPOSED ADJACENT THE INNER SURFACE OF AT LEAST A PORTION OF SAID SLEEVE, SAID COOLING MEANS COMPRISING A SERIES OF HAIR PIN TUBES, EACH TUBE BEING BENT BACK UPON ITSELF AND EXTENDING AXIALLY OF THE CRUCIBLE ADJACENT THE INNER SURFACE OF SAID SLEEVE, EACH TUBE BEING
References Cited (Backward Citations)
US3056847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |