Patent US4000246A successfully refreshed from Google Patents.
US4000246A
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Removal of gases from an enclosed space using metal hydrocarbyl oxides
Assignee: Dow Chemical Co
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Filing: 1975-01-31
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Granted: 1976-12-28
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Expires: 1995-01-31
Abstract
Abstract Gases are removed from enclosed spaces by (1) purging the space to be enclosed with a reactive gas such as carbon dioxide, (2) adding a metal hydrocarbyloxide and a solid absorbent for the volatile reaction products of the reactive gas and the metal hydrocarbyloxide, e.g., a solid absorbent such as activated charcoal, and (3) enclosing the space, e.g., by hermetically sealing the container. This method for gas removal is particularly useful in the production of thermal insulating articles such as double walled vacuum containers for storage of foods and beverages.
Inventors
- 👤 Wilhelm E. Walles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:29
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/06; F16L59/065; F04; F04B; F04B37/00; F04B37/02; Y; Y10; Y10S; Y10S220/00; Y10S220/901
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
147 words
A method for removing gases from an enclosed space comprising the steps of (1) purging the space to be enclosed with a reactive gas; (2) placing (a) a hydrocarbyloxide corresponding to the chemical formula (RO) a M wherein R is a hydrocarbon radical having from 2 to 15 carbon atoms, M is a metal of Groups 1a, 1b, 2a, 2b and 3 of Mendeleev's Periodic Table of the Elements and a is a whole number corresponding to the valence of M and (b) a solid absorbent in the space, said reactive gas being capable of reacting with the hydrocarbyloxide to form a volatile reaction product, said absorbent being capable of absorbing said volatile reaction product; and (3) enclosing the space whereby the gas is removed from the vapor phase by reacting with the metal hydrocarbyloxide to form volatile reaction products that are absorbed by the solid absorbent.
Claim 2
Independent Claim
147 words
A method for removing gases from an enclosed space comprising the steps of (1) purging the space to be enclosed with a reactive gas; (2) placing (a) a hydrocarbyloxide corresponding to the chemical formula (RO) a M wherein R is a hydrocarbon radical having from 2 to 15 carbon atoms, M is a metal of Groups 1a, 1b, 2a, 2b and 3 of Mendeleev's Periodic Table of the Elements and a is a whole number corresponding to the valence of M and (b) a solid absorbent in the space, said reactive gas being capable of reacting with the hydrocarbyloxide to form a volatile reaction product, said absorbent being capable of absorbing said volatile reaction product; and (3) enclosing the space whereby the gas is removed from the vapor phase by reacting with the metal hydrocarbyloxide to form volatile reaction products that are absorbed by the solid absorbent.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the reactive gas is carbon dioxide.
Claim 4
Dependent Claim
25 words
The method of claim 2 wherein the hydrocarbyloxide is an alkoxide of lithium, sodium or potassium wherein the alkoxide has 2 to 10 carbon atoms.
Claim 5
Dependent Claim
19 words
The method of claim 2 wherein the hydrocarbyloxide is an alkoxide of lithium having 3 to 5 carbon atoms.
Claim 6
Dependent Claim
11 words
The method of claim 2 wherein the hydrocarbyloxide is lithium isopropoxide.
Claim 7
Dependent Claim
17 words
The method of claim 5 wherein the solid absorbent is a finely divided powder of activated carbon.
Claim 8
Dependent Claim
29 words
The method of claim 1 wherein the enclosed space is defined by a thermal insulating container employed for maintaining gaseous liquid and solid materials in hot or cold state.
Claim 9
Dependent Claim
58 words
The method of claim 1 wherein the hydrocarbyloxide is an alkoxide of lithium having from 3 to 5 carbon atoms, the reactive gas is a carbon dioxide, the solid absorbent is a finely divided powder of activated charcoal and the enclosed space is defined by a thermal insulating container whereby the enclosed space is substantially evacuated of gases.
Claim 10
Dependent Claim
68 words
The method of claim 8 wherein the alkoxide is in the form of particles having sizes in the range from about 1 to about 500 micrometers and the charcoal is in the form of a particulate having particles of sizes in the range from about 0.1 to 100 micrometers such that said particulate has a surface area in the range from about 50 to about 2000 square meters.
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) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |