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US3146300A
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Corona protection screen for inductor coils in vacuum furnaces
Assignee: ABB Norden Holding AB
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Filing: 1960-09-19
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Granted: 1964-08-25
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Expires: 1980-09-19
Abstract
No abstract record available.
Inventors
- 👤 Beckius Ivar
- 👤 Rydinger Mats
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:42
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A VACUUM FURNACE INDUCTOR COIL ADAPTED TO BE ARRANGED IN A VACUUM CHAMBER, SAID INDUCTOR COIL COMPRISING AN ELECTRIC CONDUCTOR FORMING A COIL FOR INDUCTION HEATING, A LAYER OF ELECTRICAL INSULATION APPLIED AROUND SAID CONDUCTOR, A CORONA PROTECTION SCREEN APPLIED AROUND SAID INSULATION ALONG THE ENTIRE LENGTH OF THE CONDUCTOR AND CONNECTED TO A POTENTIAL LOWER THAN THE CRITICAL TENSION AT WHICH CORONA APPEARS, SAID CORONA PROTECTION SCREEN COMPRISING AT LEAST TWO ELECTRICALLY CONDUCTING PARTS EXTENDING IN THE LONGITUDINAL DIRECTION OF SAID CONDUCTOR, ARRANGED SUCCESSIVELY ONE AFTER THE OTHER IN THE LONGITUDINAL DIRECTION OF THE CONDUCTOR AND INSULATED FROM AND PARTIALLY OVERLAPPING EACH OTHER, AND A TIGHT, PORE-FREE COVER OF SILICONE RUBBER ENCLOSING SAID ELECTRICALLY CONDUCTING PARTS.
Claim 2
Dependent Claim
117 words
A VACUUM FURNACE INDUCTOR COIL ADAPTED TO BE ARRANGED IN A VACUUM CHAMBER, SAID INDUCTOR COIL COMPRISING AN ELECTRIC CONDUCTOR FORMING A COIL FOR INDUCTION HEATING, A LAYER OF ELECTRICAL INSULATION APPLIED AROUND SAID CONDUCTOR, A CORONA PROTECTION SCREEN APPLIED AROUND SAID INSULATION ALONG THE ENTIRE LENGTH OF THE CONDUCTOR AND CONNECTED TO A POTENTIAL LOWER THAN THE CRITICAL TENSION AT WHICH CORONA APPEARS, SAID CORONA PROTECTION SCREEN COMPRISING AT LEAST TWO ELECTRICALLY CONDUCTING PARTS EXTENDING IN THE LONGITUDINAL DIRECTION OF SAID CONDUCTOR, ARRANGED SUCCESSIVELY ONE AFTER THE OTHER IN THE LONGITUDINAL DIRECTION OF THE CONDUCTOR AND INSULATED FROM AND PARTIALLY OVERLAPPING EACH OTHER, AND A TIGHT, PORE-FREE COVER OF SILICONE RUBBER ENCLOSING SAID ELECTRICALLY CONDUCTING PARTS.
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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) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |