Electrical resistance body and process for its manufacture
Abstract
Abstract DESCRIBED IS A PROCESS FOR PRODUCING A CERAMIC RESISTANCE BODY HOUSING HAVING A SEMICONDUCTING GLAZE. THE PROCESS COMPRISES PREPARING A BASE CERAMIC BODY BY MELTING RAW MATERIALS TO FORM A BASIC MOLTEN CERAMIC GLASS COMPOSITION CONTAINING BY WEIGHT ESSENTIALLY 42 TO 51 PERCENT SIO2, 32 TO 37 PERCENT AL2O3, 3 TO 11 PERCENT LI2O, 4 TO 9 PERCENT TIO2, 4 TO 12 PERCENT MGO AND 1 TO 4.4 PERCENT B2O3, ADMIXING TO SAID BASIC MOLTEN CERAMIC GLASS COMPOSITION FROM A TRACE UP TO 2.5 PERCENT BY WEIGHT OF CU2O AND FROM A TRACE UP TO 12 PERCENT OF AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE METAL OXIDES CDO, NIO, CR2O3, MNO2, AND EQUIMOLAR METALLIC COMPOUNDS WHICH YIELD SAID METAL OXIDES UPON HEATING, AND DEVITRIFYING THE COMPOSITION IN THE PRESENCE OF AIR AT 700-1000*C.
Inventors
- 👤 Wilhelm Baum
Bibliographic Details
Claims Analysis
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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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |