US3695840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing metal oxides with arc gas heaters
Assignee: PPG Industries Inc
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Filing: 1970-05-04
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Granted: 1972-10-03
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Expires: 1990-05-04
Abstract
Abstract EXTERNAL SURFACE OF THE FRONT ELECTRODE OF THE ARC GAS HEATER. METAL OXIDES, SUCH AS TITANIUM DIOXIDE, ARE PREPARED BY VAPOR PHASE OXIDATION OF CORRESPONDING METAL HALIDES IN A REACTION SPACE SUPPLIED WITH HEAT ENERGY FROM A GAS STREAM HEATED BY ELECTRICAL ENERGY. ARC GAS HEATERS HAVING FROM AND BACK ELECTORDES ARE DESCRIBED. MAGNETIC FIELD MEANS ABOUT THE FRONT ELECTRODE ARE USED FOR PREVENTING ELONGATION OF THE ARC STRUCK BETWEEN THE FRONT AND BACK ELECTRODE AND PREVENTING LOCATION OF THE ARC FOOT ON THE
Inventors
- 👤 Emil Pfender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:23
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; C01B13/20; C01B13/22; C01B13/28; Y; Y10; Y10S; Y10S423/00; Y10S423/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |