US2902392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Work pieces for high temperature operation and method of making them
Assignee: Siemens Plania Werke AG
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Filing: 1955-08-12
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Granted: 1959-09-01
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Expires: 1975-08-12
Abstract
No abstract record available.
Inventors
- 👤 Fitzer Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:20
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/10; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5025; C04B41/5035; H; H01; H01B; H01B1/00; H01B1/06; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/148; C04B2111/00; C04B2111/00474; C04B2111/00482; C04B2111/00525; H05B2203/00; H05B2203/018; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12069; Y10T428/12076; Y10T428/12493; Y10T428/12535; Y10T428/12583; Y10T428/1259; Y10T428/12611; Y10T428/12674; Y10T428/12771; Y10T428/12806; Y10T428/12861; Y10T428/12889
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
FOR USE IN AN ELECTRIC RESISTANCE FURNACE, A HEATING ROD HAVING A HEATING PORTION MADE OF MOLYBDENUM DISILICIDE WHICH IS SUBJECTED IN AN OXIDIZING ATMOSPHERE TO RELATIVELY HIGH OPERATING TEMPERATURES LYING BETWEEN ABOUT 1000* C. AND 1700* C., A COATING CONSISTING SUBSTANTIALLY OF SILICON DIOXIDE FORMING UPON SAID HEATING PORTION INCIDENT TO OPERATIVE HEATING THEREOF, SUCH COATING PROTECTING SAID HEATING PORTION AGAINST DESTRUCTIVE OXIDATION, AND HAVING A TERMINAL PORTION WHICH IS SUBJECTED TO LOWER OPERATING TEMPERATURES LYING BETWEEN ABOUT 300* C. AND ABOUT 700* C., SAID TERMINAL PORTION EXTENDING FROM SAID HEATING PORTION CONTIGUOUS THEREWITH AND CONTAINING AT LEAST UPON THE SURFACE THEREOF OXIDATION-PROOF MATERIAL SELECTED FROM THE CLASS OF MATERIALS CONSISTING OF CHRONIUM, TITANIUM DISILICIDE AND SILVER-SILICON ALLOY TO PROTECT SAID TERMINAL PORTION AGAINST DESTRUCTIVE OXIDATION IN THE PRESENCE OF SAID LOWER TEMPERATURES.
Claim 2
Dependent Claim
134 words
FOR USE IN AN ELECTRIC RESISTANCE FURNACE, A HEATING ROD HAVING A HEATING PORTION MADE OF MOLYBDENUM DISILICIDE WHICH IS SUBJECTED IN AN OXIDIZING ATMOSPHERE TO RELATIVELY HIGH OPERATING TEMPERATURES LYING BETWEEN ABOUT 1000* C. AND 1700* C., A COATING CONSISTING SUBSTANTIALLY OF SILICON DIOXIDE FORMING UPON SAID HEATING PORTION INCIDENT TO OPERATIVE HEATING THEREOF, SUCH COATING PROTECTING SAID HEATING PORTION AGAINST DESTRUCTIVE OXIDATION, AND HAVING A TERMINAL PORTION WHICH IS SUBJECTED TO LOWER OPERATING TEMPERATURES LYING BETWEEN ABOUT 300* C. AND ABOUT 700* C., SAID TERMINAL PORTION EXTENDING FROM SAID HEATING PORTION CONTIGUOUS THEREWITH AND CONTAINING AT LEAST UPON THE SURFACE THEREOF OXIDATION-PROOF MATERIAL SELECTED FROM THE CLASS OF MATERIALS CONSISTING OF CHRONIUM, TITANIUM DISILICIDE AND SILVER-SILICON ALLOY TO PROTECT SAID TERMINAL PORTION AGAINST DESTRUCTIVE OXIDATION IN THE PRESENCE OF SAID LOWER TEMPERATURES.
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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) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |