US3801285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for receiving crystals
Assignee: Individual
•
Filing: 1972-03-22
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Granted: 1974-04-02
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Expires: 1992-03-22
Abstract
Abstract Apparatus for recovering crystals from a melt or solution which is introduced into a crystal paste prepared from the melt or solution having a closed-loop system of pipes containing one or more cooling zones wherein the pipes closing the system or connecting the cooling zones have about the same diameter than the pipes of the cooling zones and are relatively short. The conveying means for the paste is mounted on a common shaft with scrapers which remove the crystals from the pipe wall.
Inventors
- 👤 E Meisenburg
- 👤 R Langenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:47
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0036; C; C07; C07C; C07C7/00; C07C7/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
22 words
An apparatus as claimed in claim 1, wherein said interconnecting pipe sections have throughout their lengths larger diameters than said cooling zones.
Claim 2
Dependent Claim
30 words
An apparatus as claimed in claim 1, wherein at least a non-cooled part of an interconnecting pipe section containing means for scraping is immediately fitted close to a cooling zone.
Claim 3
Dependent Claim
37 words
An apparatus as claimed in claim 1, wherein said outlet has a chamber having a diameter greater as the diameter of the cooling zones, and said transporting means being propellers having its shaft extending into said outlet.
Claim 4
Independent Claim
168 words
An apparatus for continuously recovering crystals from a melt or solution by indirect cooling consisting of a closed pipe system incorporating only cooling zones as its thermal means, an inlet in said system for introducing a crystal paste thereto, a first cooling zone downstream from said inlet, means for externally cooling said first cooling zone, a second cooling zone downstream from said first cooling zone, means for externally cooling said second cooling zone, an outlet downstream from said second cooling zone, conveying means for transporting the crystals through said closed pipe system and for scraping the crystals off the pipe walls in said cooling zones, said conveying means including a single separate driving shaft for each cooling zone, two sets of pipe sections interconnecting said cooling zones, and each of said pipe sections having a diameter at least as great as the diameters of said cooling zones and the longer of the two sets of pipe sections having a length about double the length of each cooling zone.
Claim 5
Dependent Claim
30 words
An apparatus as claimed in claim 5 wherein said outlet has a filtrate collecting chamber, and said conveying means being a screw extruder having its shaft extending into said outlet.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |