Patent US3769776A successfully refreshed from Google Patents.
US3769776A
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US
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Method for thermal activation of a surface active material
Assignee: Institute for Energy Technology
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Filing: 1972-02-22
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Granted: 1973-11-06
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Expires: 1992-02-22
Abstract
Abstract The present invention relates to a method for thermal activation of a surface active material, mainly for the purpose of increasing the gas sorption ability of the material. It is previously known to improve the sorption ability by heating the sorption agent to a temperature, preferably above 300* C and thereafter slowly cooling said agent to room temperature. According to the invention, however, the slow cooling is replaced by a quenching to a temperature below -75* C, for example, in liquid nitrogen or helium. This activation method has proved to give more efficient sorption agents for several gases, but especially for nitrogen and xenon.
Inventors
- 👤 R Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:04
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; B01J20/10; B01J20/16; B01J20/18; B01J20/183
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
53 words
A method as claimed in claim 1, wherein said gas components are selected from the group consisting of oxygen, nitrogen, krypton and xenon, and the sorption agent is an alumina which has been heated to a temperature between about 600* C and about 950* C, and has been subsequently quenched in liquid nitrogen.
Claim 2
Dependent Claim
38 words
A method as claimed in claim 1, wherein the sorption agent is molecular sieve 5A which has been heated to a temperature between about 500* C and about 700* C, and has been subsequently quenched in liquid nitrogen.
Claim 3
Dependent Claim
57 words
A method as claimed in claim 1, wherein said gas components are selected from the group consisting of oxygen, nitrogen, krypton and xenon, and the sorption agent is a granulate of MgO and SiO2 which has been heated to a temperature between about 300* C and about 600* C, and has been subsequently quenched in liquid nitrogen.
Claim 4
Dependent Claim
53 words
A method as claimed in claim 1, wherein said gas components are selected from the group consisting of oxygen, nitrogen, krypton and xenon, and the sorption agent is a bauxite which has been heated to a temperature between about 300* C and about 800* C and has been subsequently quenched in liquid nitrogen.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |