US3791435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous dehydration apparatus
Assignee: Huels AG
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Filing: 1971-12-17
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Granted: 1974-02-12
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Expires: 1991-12-17
Abstract
Abstract Improved drying apparatus for the continuous dehydration of wet orthoboric acid to metaboric acid comprising a vessel fitted with product feed and discharge lines; with gas inlet and vapor outlet lines; and a vertically mounted agitator close fitted to the bottom and wall of the vessel; wherein the agitator has a vane perpendicularly mounted on the agitator shaft in scraping relationship to opposite sides of the vessel wall, on which vane is vertically mounted scraper elements; positioned at the ends of the vane in scraping relationship to the vessel wall, and elongate paddles, positioned intermediate the agitator shaft and the scraper elements at an angle of incidence to the axis of the vane.
Inventors
- 👤 H Grasemann
- 👤 H Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:15
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/22; B01D1/222; C; C01; C01B; C01B35/00; C01B35/08; C01B35/10; C01B35/1045
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
Drying apparatus for the continuous dehydration of orthoboric acid and the like materials tending to lump when drying, comprising a vessel fitTed with product feed and discharge lines, gas inlet and outlet lines; a vertically positioned rotable agitator axially mounted therein and comprising a vertical shaft, vanes mounted on said shaft in close proximity to the bottom of the vessel and projecting radially outwardly, vertical scraper elements mounted on said vanes parallel to and in close proximity to sidewall of the vessel, said vanes and said scraper elements having blade members fitted in scraping relationship to the bottom and sidewall, respectively, to the vessel; rotating paddles mounted perpendicularly upwardly on said vanes; and stationary paddles mounted perpendicularly downwardly from the top of said vessel which mesh with said rotating paddles, said rotating and stationary paddles being non-circular in crosssection and mounted so that their respective axes are at an alternatingly positive and negative angle of incidence with respect to the axis of said agitator vane.
Claim 2
Dependent Claim
165 words
Drying apparatus for the continuous dehydration of orthoboric acid and the like materials tending to lump when drying, comprising a vessel fitTed with product feed and discharge lines, gas inlet and outlet lines; a vertically positioned rotable agitator axially mounted therein and comprising a vertical shaft, vanes mounted on said shaft in close proximity to the bottom of the vessel and projecting radially outwardly, vertical scraper elements mounted on said vanes parallel to and in close proximity to sidewall of the vessel, said vanes and said scraper elements having blade members fitted in scraping relationship to the bottom and sidewall, respectively, to the vessel; rotating paddles mounted perpendicularly upwardly on said vanes; and stationary paddles mounted perpendicularly downwardly from the top of said vessel which mesh with said rotating paddles, said rotating and stationary paddles being non-circular in crosssection and mounted so that their respective axes are at an alternatingly positive and negative angle of incidence with respect to the axis of said agitator vane.
Claim 3
Dependent Claim
22 words
Apparatus according to claim 1 wherein the agitator shaft has a blade-shaped extension extending into a product discharge line of the vessel.
Claim 4
Dependent Claim
21 words
Apparatus according to claim 1 wherein the spacing between the scraper blades and the vessel walls is 0.1 - 30 mm.
Claim 5
Dependent Claim
13 words
Apparatus according to claim 1 wherein the paddles are rectangular in cross section.
Claim 6
Dependent Claim
20 words
Apparatus according to claim 4 wherein the angle of incidence of the axis of the paddles is 1* - 90*.
Claim 7
Dependent Claim
25 words
Apparatus according to claim 5 wherein the edge of the blades have an angle of 5* - 50* relative to the axis of the blades.
Claim 8
Dependent Claim
24 words
Apparatus according to claim 1 wherein the juncture of the product discharge line and the vessel comprises means for heating or cooling the juncture.
Claim 9
Dependent Claim
31 words
Apparatus according to claim 1 wherein the agitator shaft has a blade-shaped extension extending into a product discharge line of the vessel and wherein the paddles are rectangular in cross section.
Claim 10
Dependent Claim
43 words
Apparatus according to claim 1 having upper vanes mounted on said shaft in close proximity to the top of the vessel and projecting radially outwardly, said upper vanes having a blade member mounted thereon in scraping relationship to the top of said vessel.
Claim 11
Dependent Claim
50 words
Apparatus according to claim 9 wherein the agitator shaft has a blade-shaped extension extending into a product discharge line of the vessel; wherein the paddles are rectangular in cross section; and wherein the juncture of the product discharge line and the vessel comprises means for heating or cooling the juncture.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |