US3849543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making metal oxides with oxygen-containing gas pre-heated over pd-au-ag-alloy electrode
Assignee: Bayer AG
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Filing: 1971-05-11
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Granted: 1974-11-19
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Expires: 1991-05-11
Abstract
Abstract DRAWING 1. IN THE PRODUCTION OF A METAL OXIDE INCLUDING THE STEPS OF PRE-HEATING AN OXYGEN-CONTAINING GAS, AND THEN MIXING SAID GAS WITH THE VAPOR OF A METAL HALIDE TO PRODUCE SAID METAL OXIDE, THE IMPROVEMENT WHICH COMPRISES PRE-HEATING SAID OXYGEN-CONTAINING GAS BY PASSAGE THROUGH AN ELECTRIC ARC ESTABLISHED ACROSS TWO ELECTRODES AT LEAST THE ANODE OF WHICH IS AN ELECTRODE MATERIAL COMPRISING A PD-AU-AG-ALLOY CONTAINING FROM ABOUT 10 TO 65% BY WEIGHT OF PALLADIUM, ABOUT 20 TO 65% BY WEIGHT OF GOLD AND ABOUT 15 TO 50% BY WEIGHT OF SILVER, WHEREBY THERE IS ESSENTIALLY NO WEIGHT LOSS OF THE ELECTRODE AND NO CONTAMINATION OF THE METAL OXIDE BY THE ELECTRODE.
Inventors
- 👤 H Zirngibl
- 👤 P Beumer
- 👤 W Weidmann
- 👤 W Fuhr
- 👤 K Jaschinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:06
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/32; H01J37/32009; H01J37/32055; C; C22; C22C; C22C5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
IN THE PRODUCTION OF A METAL OXIDE INCLUDING THE STEPS OF PRE-HEATING AN OXYGEN-CONTAINING GAS, AND THEN MIXING SAID GAS WITH THE VAPOR OF A METAL HALIDE TO PRODUCE SAID METAL OXIDE, THE IMPROVEMENT WHICH COMPRISES PRE-HEATING SAID OXYGEN-CONTAINING GAS BY PASSAGE THROUGH AN ELECTRIC ARC ESTABLISHED ACROSS TWO ELECTRODES AT LEAST THE ANODE OF WHICH IS AN ELECTRODE MATERIAL COMPRISING A PD-AU-AG-ALLOY CONTAINING FROM ABOUT 10 TO 65% BY WEIGHT OF PALLADIUM, ABOUT 20 TO 65% BY WEIGHT OF GOLD AND ABOUT 15 TO 50% BY WEIGHT OF SILVER, WHEREBY THERE IS ESSENTIALLY NO WEIGHT LOSS OF THE ELECTRODE AND NO CONTAMINATION OF THE METAL OXIDE BY THE ELECTRODE.
Claim 2
Dependent Claim
110 words
IN THE PRODUCTION OF A METAL OXIDE INCLUDING THE STEPS OF PRE-HEATING AN OXYGEN-CONTAINING GAS, AND THEN MIXING SAID GAS WITH THE VAPOR OF A METAL HALIDE TO PRODUCE SAID METAL OXIDE, THE IMPROVEMENT WHICH COMPRISES PRE-HEATING SAID OXYGEN-CONTAINING GAS BY PASSAGE THROUGH AN ELECTRIC ARC ESTABLISHED ACROSS TWO ELECTRODES AT LEAST THE ANODE OF WHICH IS AN ELECTRODE MATERIAL COMPRISING A PD-AU-AG-ALLOY CONTAINING FROM ABOUT 10 TO 65% BY WEIGHT OF PALLADIUM, ABOUT 20 TO 65% BY WEIGHT OF GOLD AND ABOUT 15 TO 50% BY WEIGHT OF SILVER, WHEREBY THERE IS ESSENTIALLY NO WEIGHT LOSS OF THE ELECTRODE AND NO CONTAMINATION OF THE METAL OXIDE BY THE ELECTRODE.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |