Patent US3311451A successfully refreshed from Google Patents.
US3311451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of finely divided amorphous silica
Assignee: Evonik Operations GmbH
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Filing: 1964-06-29
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Granted: 1967-03-28
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Expires: 1984-06-29
Abstract
No abstract record available.
Inventors
- 👤 Biegler Hanns
- 👤 Neugebauer Walter
- 👤 Kempers Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:58
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B33/182; C01P; C01P2002/00; C01P2002/02; C01P2004/00; C01P2004/51; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN THE METHOD OF PRODUCING FINELY DIVIDED AMORPHOUS SILICA BY REACTING A SILICA CONTAINING MATERIAL WITH A REDUCING AGENT IN AN ELECTRIC ARC FURNACE TO PRODUCE A STREAM OF GASEOUS SILICON MONOXIDE AND OXIDIZING THE GASEOUS SILICON MONOXIDE IN THE STREAM LEAVING THE FURNACE WITH AN OXIDIZING GAS TO FORM THE FINELY DIVIDED AMORPHOUS SILICA, THE STEPS OF ENVELOPING SAID STREAM OF GASEOUS SILICON MONOXIDE AFTER IT HAS LEFT THE FURNACE WITH AN ASPIRATING ENVELOPE OF A PORTION OF THE OXIDIZING GAS TO INCREASE THE VELOCITY OF SUCH GAS STREAM LEAVING THE FURNACE AND THEREAFTER INJECTING THE REMAINDER OF THE OXIDIZING GAS INTO SUCH ENVELOPED STREAM TO CAUSE TURBULENT MIXTURE OF THE ENTIRE GAS MIXTURE.
Claim 2
Dependent Claim
115 words
IN THE METHOD OF PRODUCING FINELY DIVIDED AMORPHOUS SILICA BY REACTING A SILICA CONTAINING MATERIAL WITH A REDUCING AGENT IN AN ELECTRIC ARC FURNACE TO PRODUCE A STREAM OF GASEOUS SILICON MONOXIDE AND OXIDIZING THE GASEOUS SILICON MONOXIDE IN THE STREAM LEAVING THE FURNACE WITH AN OXIDIZING GAS TO FORM THE FINELY DIVIDED AMORPHOUS SILICA, THE STEPS OF ENVELOPING SAID STREAM OF GASEOUS SILICON MONOXIDE AFTER IT HAS LEFT THE FURNACE WITH AN ASPIRATING ENVELOPE OF A PORTION OF THE OXIDIZING GAS TO INCREASE THE VELOCITY OF SUCH GAS STREAM LEAVING THE FURNACE AND THEREAFTER INJECTING THE REMAINDER OF THE OXIDIZING GAS INTO SUCH ENVELOPED STREAM TO CAUSE TURBULENT MIXTURE OF THE ENTIRE GAS MIXTURE.
References Cited (Backward Citations)
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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) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |