US3246275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric resistance elements of silicon carbide and metal silicide
Assignee: Kanthal AB
•
Filing: 1963-06-17
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Granted: 1966-04-12
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Expires: 1983-06-17
Abstract
No abstract record available.
Inventors
- 👤 Schrewelius Nils Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:59
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/58085; C04B35/58092; C04B35/56; C04B35/565; C04B35/573; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6316; H; H01; H01B; H01B1/00; H01B1/04; H01C; H01C7/00; H01C7/02; H01C7/022; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/148; C04B2235/00; C04B2235/70; C04B2235/74; C04B2235/75; H05B2203/00; H05B2203/018
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
ELECTRIC RESISTANCE ELEMENT HAVING A CENTRAL ZONE ADAPTED TO BECOME INCANDESCENT WHEN CONNECTED TO A SOURCE OF ELECTRICAL POWER AND TERMINAL ZONE CONNECTED THERETO, SAID ZONES CONSISTING OF A RECRYSTALLIZED SKELETON OF SILICON CARBIDE PARTICLES THE PORES OF SAID SKELETON BEING FILLED OUT SO THAT THE POROSITY OF THE ELEMENT IS LESS THAN 5% BY VOLUME, CHARACTERIZED IN THAT THE PORE FILLING OF SAID CENTRAL ZONE PORTION OF THE SKELETON CONSISTS ESSENTIALLY OF SILICON CARBIDE FORMED IN SITU WHEREAS IN THE TERMINAL ZONE THE FILLING CONSISTS ESSENTIALLY OF MATERIAL OF THE GROUP CONSISTING OF MOLYBDENUM DISILICIDE AND MIXTURES OF SILICON CARBIDE AND MOLYBDENUM DISILICIDE.
Claim 2
Dependent Claim
104 words
ELECTRIC RESISTANCE ELEMENT HAVING A CENTRAL ZONE ADAPTED TO BECOME INCANDESCENT WHEN CONNECTED TO A SOURCE OF ELECTRICAL POWER AND TERMINAL ZONE CONNECTED THERETO, SAID ZONES CONSISTING OF A RECRYSTALLIZED SKELETON OF SILICON CARBIDE PARTICLES THE PORES OF SAID SKELETON BEING FILLED OUT SO THAT THE POROSITY OF THE ELEMENT IS LESS THAN 5% BY VOLUME, CHARACTERIZED IN THAT THE PORE FILLING OF SAID CENTRAL ZONE PORTION OF THE SKELETON CONSISTS ESSENTIALLY OF SILICON CARBIDE FORMED IN SITU WHEREAS IN THE TERMINAL ZONE THE FILLING CONSISTS ESSENTIALLY OF MATERIAL OF THE GROUP CONSISTING OF MOLYBDENUM DISILICIDE AND MIXTURES OF SILICON CARBIDE AND MOLYBDENUM DISILICIDE.
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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) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |