US3092681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric resistance furnaces and the like
Assignee: Kanthal AB
•
Filing: 1959-09-18
•
Granted: 1963-06-04
•
Expires: 1979-09-18
Abstract
No abstract record available.
Inventors
- 👤 Malm Anders Ewert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:01
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
IN A SOAKING PIT FURNACE FOR THERMAL TREATMENT IN THE AIR OF STEEL, A FURNACE CHAMBER, A HEATING SOURCE CONSISTING OF ELONGATED, HAIRPIN-SHAPED RESISTOR ELEMENTS CONTAINING MOLYBDENUM DISILICIDE, MOSI2, HAVING THE PROPERTY OF PRODUCING ON THEIR SURFACE A LAYER CONTAINING SILICON DIOXIDE WHEN HEATED TO HIGH TEMPERATURES, BECAUSE OF THE ACTION OF THE OXYGEN OF THE AIR, SAID ELEMENTS EACH HAVING A GLOW PORTION DEPENDING VERTICALLY INTO THE FURNACE CHAMBER, AND EACH ELEMENT HAVING TWO LEAD-IN ELECTRODES EXTENDING TO THE EXTERIOR OF THE FURNACE CHAMBER AT A SHORT DISTANCE FROM ONE ANOTHER THROUGH A COMMON OPENING SO THAT THE ELEMENTS ARE REPLACEABLE INDIVIDUALLY WHILE THE FURNACE IS FUNCTIONING, THE COMPOSITION AND ARRANGEMENT OF RESISTOR ELEMENTS BEING SUCH, THAT IN OPERATION THE SUPERFICIAL LAYER CONTAINING SILICON DIOXIDE TOGETHER WITH OXIDE PARTICLES DEPOSITED ON THE GLOW ZONE OF
Claim 2
Dependent Claim
136 words
IN A SOAKING PIT FURNACE FOR THERMAL TREATMENT IN THE AIR OF STEEL, A FURNACE CHAMBER, A HEATING SOURCE CONSISTING OF ELONGATED, HAIRPIN-SHAPED RESISTOR ELEMENTS CONTAINING MOLYBDENUM DISILICIDE, MOSI2, HAVING THE PROPERTY OF PRODUCING ON THEIR SURFACE A LAYER CONTAINING SILICON DIOXIDE WHEN HEATED TO HIGH TEMPERATURES, BECAUSE OF THE ACTION OF THE OXYGEN OF THE AIR, SAID ELEMENTS EACH HAVING A GLOW PORTION DEPENDING VERTICALLY INTO THE FURNACE CHAMBER, AND EACH ELEMENT HAVING TWO LEAD-IN ELECTRODES EXTENDING TO THE EXTERIOR OF THE FURNACE CHAMBER AT A SHORT DISTANCE FROM ONE ANOTHER THROUGH A COMMON OPENING SO THAT THE ELEMENTS ARE REPLACEABLE INDIVIDUALLY WHILE THE FURNACE IS FUNCTIONING, THE COMPOSITION AND ARRANGEMENT OF RESISTOR ELEMENTS BEING SUCH, THAT IN OPERATION THE SUPERFICIAL LAYER CONTAINING SILICON DIOXIDE TOGETHER WITH OXIDE PARTICLES DEPOSITED ON THE GLOW ZONE OF
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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) | 1966-06-03 | 1966-12-03 | 1967-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-03 | 1970-12-03 | 1971-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-03 | 1974-12-03 | 1975-06-04 | $7700.00 | Window Closed / Lapsed |