US3709664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High shear mixing apparatus for making silica gels
Assignee: National Petro-Chemicals Corp
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Filing: 1970-08-14
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Granted: 1973-01-09
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Expires: 1990-08-14
Abstract
Abstract Apparatus comprising a rotary agitator possessing movable sets of flat blades interspersed with stationary sets of flat blades, the pitch and clearances of the blades being such that high shear agitation is obtained. This apparatus is suitable for use in the carrying out of any process requiring high shear mixing. It has been found to be particularly useful in the preparation of silica gels of high quality.
Inventors
- 👤 J Krekeler
- 👤 C Wehr
- 👤 H Aboutboul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:42
CPC Classifications
B; B01; B01F; B01F35/00; B01F35/90; B01F35/92; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/152; C01B33/154; B01F27/00; B01F27/80; B01F27/90; B01F27/902; Y; Y10; Y10S; Y10S516/00; Y10S516/924; Y10S516/929; Y10S516/93
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
18 words
The apparatus of claim 1, wherein each of said blades is pitched at an angle of 45* .
Claim 2
Dependent Claim
16 words
The apparatus of claim 1, wherein each of said sets of rotatable blAdes contains four blades.
Claim 3
Dependent Claim
24 words
The apparatus of claim 1, which contains five rotatable sets of blades and four stationary sets of blades, each stationary set containing two blades.
Claim 4
Dependent Claim
14 words
The apparatus of claim 1 comprising, in addition, a jacket disposed around said vessel.
Claim 5
Dependent Claim
12 words
The apparatus of claim 1 wherein said angular offset is about 18*.
Claim 6
Dependent Claim
12 words
The apparatus of claim 1, wherein said clearance is about one-half inch.
Claim 7
Dependent Claim
40 words
The apparatus of claim 4, wherein the second and fifth rotatable sets of blades, the first set being the lowermost set in the vessel, are pitched in a direction opposite to the pitch of the other rotatable sets of blades.
Claim 8
Dependent Claim
28 words
The apparatus of claim 1 wherein at least five sets of said rotatable blades are provided and wherein at least four sets of said stationary blades are provided.
Claim 9
Dependent Claim
28 words
The apparatus of claim 1 wherein the number of sets of said stationary blades is equal to one less than the number of sets of said rotatable blades.
Claim 10
Dependent Claim
36 words
The apparatus of claim 10 wherein the uppermost set of blades is rotatable, the blades of said uppermost set being pitched downwardly, and wherein the blades of the lowermost set of rotatable blades are pitched upwardly.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |