US2831652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of microspheroidal catalysts
Assignee: Wyeth Holdings LLC
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Filing: 1954-11-24
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Granted: 1958-04-22
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Expires: 1974-11-24
Abstract
No abstract record available.
Inventors
- 👤 Albert R Gemperle
- 👤 John J Schilf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:34
CPC Classifications
B; B05; B05B; B05B3/00; B05B3/02; B05B3/10; B05B3/1007; B05B3/1021; B01; B01J; B01J2/00; B01J2/02; B01J2/04; B01J21/00; B01J21/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A METHOD OF PRODUCING MICROSPHEROIDAL SILICEOUS CATALYST OF IMPROVED SPHERICALLY AND ATTRITION RESISTANCE WHICH COMPRISES SPRAYING OUTWARDLY FROM AN AXIS OF ROTATION AN AQUEOUS DISPERSION OF HYDRATED SILICA-CONTAINING CATALYST MATERIAL WHILE SIMULTANEOUSLY IMPINGING THEREON A SET OF CONVEX SURFACES MOVING IN A CIRCULAR PATH AROUND SAID AXIS, SAID SURFACES BEING CONVEX IN THE DIRECTION OF ROTATION AND DISCHARGING PRACTICALLY ALL OF THE
Claim 2
Independent Claim
62 words
A METHOD OF PRODUCING MICROSPHEROIDAL SILICEOUS CATALYST OF IMPROVED SPHERICALLY AND ATTRITION RESISTANCE WHICH COMPRISES SPRAYING OUTWARDLY FROM AN AXIS OF ROTATION AN AQUEOUS DISPERSION OF HYDRATED SILICA-CONTAINING CATALYST MATERIAL WHILE SIMULTANEOUSLY IMPINGING THEREON A SET OF CONVEX SURFACES MOVING IN A CIRCULAR PATH AROUND SAID AXIS, SAID SURFACES BEING CONVEX IN THE DIRECTION OF ROTATION AND DISCHARGING PRACTICALLY ALL OF THE
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) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |