Patent US3768790A successfully refreshed from Google Patents.
US3768790A
Expired / Lapsed
US
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Apparatus for the manufacture of potassium
Assignee: Knapsack AG
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Filing: 1972-08-16
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Granted: 1973-10-30
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Expires: 1992-08-16
Abstract
Abstract Production of metallic potassium. K2SO4 placed in a reactor is reduced by means of iron in the presence of CaO under reduced pressure and with supply of heat, and the resulting potassium, which distils over, is condensed.
Inventors
- 👤 U Landt
- 👤 H Seifert
- 👤 O Bretschneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:52
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/10; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S266/00; Y10S266/905
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
15 words
The apparatus as claimed in claim 1, wherein the crucible is a chrome-nickel-molybdenum steel crucible.
Claim 2
Dependent Claim
37 words
The apparatus as claimed in claim 1, wherein the heat radiator comprises one or more electrically heated graphite elements, whose power leads are arranged so as to project into the crucible and enveloped therein by a jacket.
Claim 3
Dependent Claim
20 words
The apparatus as claimed in claim 3, wherein the jacket has a graphite base portion and a steel head portion.
Claim 4
Dependent Claim
16 words
The apparatus as claimed in claim 1, wherein the radiator comprises a helically slitted graphite tube.
Claim 5
Dependent Claim
16 words
The apparatus as claimed in claim 1 wherein a heating system is disposed within the interspace.
Claim 6
Dependent Claim
24 words
The apparatus as claimed in claim 1 wherein the cover, the crucible and the furnace are connected together by means of a water-cooled flange.
Claim 7
Dependent Claim
46 words
The apparatus as claimed in claim 1, wherein the crucible base portion is connected to a container permitting the removal of slag under vacuum, and the crucible head portion is connected to a valved reservoir permitting the supply of reaction material to the crucible, under vacuum.
Claim 8
Dependent Claim
21 words
The apparatus as claimed in claim 8, wherein the container is fitted with a heatable conduit connecting it to the crucible.
References Cited (Backward Citations)
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Cited
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US2920951A
Cited
US3136627A
Cited
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Cited
US3484233A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |