US3966639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amphora aggregates
Assignee: Standard Oil Co
•
Filing: 1974-07-22
•
Granted: 1976-06-29
•
Expires: 1994-07-22
Abstract
Abstract Hard, rounded aggregates are produced by preparing droplets of a slurry consisting of suspending liquid containing distinct particles of a solid and dropping the droplets of the slurry onto a bed of particles under conditions where the suspending liquid of the slurry droplet is removed. This technique is especially desirable for making unique fixed-bed catalysts.
Inventors
- 👤 James L. Callahan
- 👤 Arthur F. Miller
- 👤 Wilfrid G. Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:41
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/02; B01J37/00; B01J37/0072
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
An aggregate having a spherical or semispherical shape, a void center and a single cavity in the external surface communicating to the void center prepared by a. preparing a slurry, the slurry comprising a suspending liquid and distinct particles of a first solid suspended in said liquid; b. preparing a particle bed consisting of particles of a second solid; c. forming droplets of the slurry; and d. dropping the droplets of the slurry into the particle bed in such manner that the total droplet is not immersed in the powder and under conditions where the suspending liquid is at least partially removed from the slurry droplet to form an aggregate of the distinct particles of the first solid.
Claim 2
Dependent Claim
118 words
An aggregate having a spherical or semispherical shape, a void center and a single cavity in the external surface communicating to the void center prepared by a. preparing a slurry, the slurry comprising a suspending liquid and distinct particles of a first solid suspended in said liquid; b. preparing a particle bed consisting of particles of a second solid; c. forming droplets of the slurry; and d. dropping the droplets of the slurry into the particle bed in such manner that the total droplet is not immersed in the powder and under conditions where the suspending liquid is at least partially removed from the slurry droplet to form an aggregate of the distinct particles of the first solid.
Claim 3
Dependent Claim
32 words
The aggregate of claim 1 containing at least one of V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, W, Rh, Pd, Pt, Ag, Au, Cd, Al, Sn, Sb, Bi or Te.
Claim 4
Dependent Claim
14 words
The aggregate of claim 1 having an external diameter of 1/16 to 1/2 inch.
References Cited (Backward Citations)
US2478194A
Cited
US2736713A
Cited
US3416888A
Cited
US3594332A
Cited
US3526602A
Cited
US3798176A
Cited
US3764565A
Cited
US3654186A
Cited
US3867281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |