US3532473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a spherical granulated silica material
Assignee: Evonik Operations GmbH
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Filing: 1966-04-27
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Granted: 1970-10-06
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Expires: 1986-04-27
Abstract
No abstract record available.
Inventors
- 👤 Hanns Biegler
- 👤 Karl Trebinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 02:55
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/12; C; C04; C04B; C04B18/00; C04B18/02; C04B18/023; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3009; C09C1/3036; F; F17; F17C; F17C13/00; F17C13/001; C01; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/50; C01P2004/60; C01P2006/00; C01P2006/10; F17C2203/00; F17C2203/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
PROCESS FOR PRODUCING A SPHERICAL GRANULATED SILICA WHICH COMPRISES FEEDING A FEED CONSISTING ESSENTIALLY OF SUBSTANTIALLY DRY, AMORPHOUS, PRECIPITATED SILICA POWDER WITH A BULK WEIGHT OF ABOUT 50 TO ABOUT 100 GRAMS PER LITER AND AN AVERAGE PARTICLE SIZE OF ABOUT 1 TO ABOUT 70 MICRONS TO A ROTAING, INLINED MIXING MEANS HAING THE MIXING SURFACE INCLINED AT A SUBSTANTIAL ANGLE FROM HORIZONTAL, PASSING THE SILICA THROUGH SAID ROTATING, INCLINED MIXING MEANS WHILE MAINTAINING IT IN A SUBSTANTIALLY DRY STATE, WITHDRAWING A SUBSTANTIALLY DRY, SPHERICAL, GRANULATED SILCIA FROM SAID ROTATING, INCLINED MIXED MEANS, AND HEAT ANNEALING SAID SPHERICAL, GRANULATED SILICA TO A TEMPERATURE UP TO ABOUT 900*C. TO INCREASE ITS PHYSICAL STRENGTH.
Claim 2
Dependent Claim
112 words
PROCESS FOR PRODUCING A SPHERICAL GRANULATED SILICA WHICH COMPRISES FEEDING A FEED CONSISTING ESSENTIALLY OF SUBSTANTIALLY DRY, AMORPHOUS, PRECIPITATED SILICA POWDER WITH A BULK WEIGHT OF ABOUT 50 TO ABOUT 100 GRAMS PER LITER AND AN AVERAGE PARTICLE SIZE OF ABOUT 1 TO ABOUT 70 MICRONS TO A ROTAING, INLINED MIXING MEANS HAING THE MIXING SURFACE INCLINED AT A SUBSTANTIAL ANGLE FROM HORIZONTAL, PASSING THE SILICA THROUGH SAID ROTATING, INCLINED MIXING MEANS WHILE MAINTAINING IT IN A SUBSTANTIALLY DRY STATE, WITHDRAWING A SUBSTANTIALLY DRY, SPHERICAL, GRANULATED SILCIA FROM SAID ROTATING, INCLINED MIXED MEANS, AND HEAT ANNEALING SAID SPHERICAL, GRANULATED SILICA TO A TEMPERATURE UP TO ABOUT 900*C. TO INCREASE ITS PHYSICAL STRENGTH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-05 | 1974-04-06 | 1974-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-05 | 1978-04-06 | 1978-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-05 | 1982-04-06 | 1982-10-06 | $7700.00 | Window Closed / Lapsed |