US2933586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heating appliances
Assignee: Individual
•
Filing: 1955-06-17
•
Granted: 1960-04-19
•
Expires: 1975-06-17
Abstract
No abstract record available.
Inventors
- 👤 Schusterius Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:12
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/141
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN AN ELECTRICAL HEATING APPLIANCE, A HEATING ELEMENT COMPRISING A COMPACT SINTERED CERAMIC BODY OF A SEMICONDUCTIVE MIXTURE OF AT LEAST 70% OF ZINC OXIDE AND THE REMAINDER CONSISTING OF A MIXTURE OF OTHER METAL OXIDES, SAID MIXTURE CONTAINING OXIDES OF METALS SELECTED FROM THE GROUP CONSISTING OF TITANIUM, NICKEL MAGNESIUM, AND ZIRCONIUM, THE RESISTIVITY OF SAID BODY HAVING A POSITIVE TEMPERATURE COEFFICIENT WITH THE MEAN VALUE OF 50.10-3 TO 200.10-3*C. WITHIN THE TEMPERATURE RANGE BETWEEN 0* AND 500*C.
Claim 2
Dependent Claim
79 words
IN AN ELECTRICAL HEATING APPLIANCE, A HEATING ELEMENT COMPRISING A COMPACT SINTERED CERAMIC BODY OF A SEMICONDUCTIVE MIXTURE OF AT LEAST 70% OF ZINC OXIDE AND THE REMAINDER CONSISTING OF A MIXTURE OF OTHER METAL OXIDES, SAID MIXTURE CONTAINING OXIDES OF METALS SELECTED FROM THE GROUP CONSISTING OF TITANIUM, NICKEL MAGNESIUM, AND ZIRCONIUM, THE RESISTIVITY OF SAID BODY HAVING A POSITIVE TEMPERATURE COEFFICIENT WITH THE MEAN VALUE OF 50.10-3 TO 200.10-3*C. WITHIN THE TEMPERATURE RANGE BETWEEN 0* AND 500*C.
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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) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |