US3603103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous crystallisation plant
Assignee: Newton Chambers and Co Ltd
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Filing: 1969-02-05
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Granted: 1971-09-07
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Expires: 1989-02-05
Abstract
Abstract The conventional Schildeknecht crystallizer has certain disadvantages which may be reduced or overcome if the standard helical conveyor is replaced wholly or in part by a screw conveyor. Furthermore it has been found essential that the finish on the conveyor of a Schildeknecht crystallizer, whether helix or screw or a combination of the two, should be CLA 63 or better for efficient crystal transport.
Inventors
- 👤 Stuart Richmond
- 👤 David W Exley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:07
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
31 words
Apparatus as claimed in claim 1 wherein said rotary conveyor mechanism is in the form of a central core within said column and a helix rotatably mounted about said central core.
Claim 2
Dependent Claim
26 words
Apparatus as claimed in claim 1 wherein said rotary conveyor mechanism is in the form of a screw conveyor which is rotatably mounted within said column.
Claim 3
Dependent Claim
29 words
Apparatus as claimed in claim 1 wherein said rotary conveyor mechanism is at least partly in the form of a screw conveyor which is rotatably mounted within said column.
Claim 4
Dependent Claim
48 words
Apparatus as claimed in claim 4, wherein said rotary conveyor mechanism is formed in part by a central core within part of said column and a helix rotatably mounted about said central core, and in part by a screw conveyor rotatably mounted in the rest of said column.
Claim 5
Dependent Claim
60 words
Apparatus as claimed in claim 5 wherein said central core and said helix are positioned in the cooling zone of said column, and said screw conveyor is positioned in the remainder of said column, the apparatus including means connecting said helix and said screw conveyor together whereby said conveyor mechanism is in effect continuous along the length of said column.
Claim 6
Dependent Claim
53 words
Apparatus as claimed in claim 5 wherein said central core and said helix are positioned in the cooling zone of said column and said screw conveyor is positioned in the rest of said column, said helix and said screw conveyor being unconnected whereby they may be driven at different speeds from each other.
Claim 7
Dependent Claim
14 words
Apparatus as claimed in claim 1 wherein said rotary conveyor mechanism is chromium plated.
Claim 8
Dependent Claim
62 words
Apparatus as claimed in claim 1 wherein said devices for heating and cooling said column comprise heating and cooling jackets conventionally mounted on the outside of said column and at opposite ends of said column, and further heating and cooling devices installed in the center of said rotary conveyor mechanism adjacent said heating and cooling jackets on the outside of said column.
Claim 9
Dependent Claim
31 words
Apparatus as claimed in claim 1 wherein said rotary conveyor mechanism has a helical hollow flight, and means are provided for circulating a heating or cooling medium through said hollow flight.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |