US3223607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing electrical heating elements with improved aluminum oxide coating
Assignee: Egyesuelt Izzolampa es Villamossagi Rt
•
Filing: 1960-02-23
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Granted: 1965-12-14
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Expires: 1980-02-23
Abstract
No abstract record available.
Inventors
- 👤 Millner Tivadar
- 👤 Fukker Karoly
- 👤 Martin Kornel
- 👤 Dvorszky Magda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:40
CPC Classifications
C; C23; C23C; C23C24/00; H; H01; H01B; H01B3/00; H01B3/02; H01B3/10; H05; H05B; H05B3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN THE PRODUCTION OF ELECTRICAL HEATING ELEMENTS BY STEPS COMPRISING COATING SAID ELEMENTS WITH ALUMINUM OXIDE, WHEREIN SAID ALUMINUM OXIDE IS SUBJECTED TO HEAT TREATMENT, THE IMPROVEMENT WHICH COMPRISES INITIALLY HEATING THE ALUMINUM OXIDE WHICH IS PREDOMINANTLY IN THE GAMMA STATE TO A TEMPERATURE IN THE RANGE OF 700* TO 1700*C. IN A NON-OXYGENOUS ATMOSPHERE FORMED BY A GAS SELECTED FROM THE GROUP CONSISTING OF HHYDROGEN, NITROGEN, AND MIXTURES THEREOF, SO AS TO CONVERT SAID GAMMAALUMINUM OXIDE ESSENTIALLY ENTIRELY TO A STABILIZED ALPHAALUMINUM OXIDE HAVING MAXIMUM INSULATING PROPERTIES WHILE PROVIDING MINIMUM LEAKAGE LOSS, AND APPLYING SAID ALPHA-ALUMINUM OXIDE AS AN INSULATIVE COATING TO A METALLIC HEATING ELEMENT.
Claim 2
Dependent Claim
107 words
IN THE PRODUCTION OF ELECTRICAL HEATING ELEMENTS BY STEPS COMPRISING COATING SAID ELEMENTS WITH ALUMINUM OXIDE, WHEREIN SAID ALUMINUM OXIDE IS SUBJECTED TO HEAT TREATMENT, THE IMPROVEMENT WHICH COMPRISES INITIALLY HEATING THE ALUMINUM OXIDE WHICH IS PREDOMINANTLY IN THE GAMMA STATE TO A TEMPERATURE IN THE RANGE OF 700* TO 1700*C. IN A NON-OXYGENOUS ATMOSPHERE FORMED BY A GAS SELECTED FROM THE GROUP CONSISTING OF HHYDROGEN, NITROGEN, AND MIXTURES THEREOF, SO AS TO CONVERT SAID GAMMAALUMINUM OXIDE ESSENTIALLY ENTIRELY TO A STABILIZED ALPHAALUMINUM OXIDE HAVING MAXIMUM INSULATING PROPERTIES WHILE PROVIDING MINIMUM LEAKAGE LOSS, AND APPLYING SAID ALPHA-ALUMINUM OXIDE AS AN INSULATIVE COATING TO A METALLIC HEATING ELEMENT.
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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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |