Patent US3869544A successfully refreshed from Google Patents.
US3869544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of aluminum hydride
Assignee: Dow Chemical Co
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Filing: 1968-06-24
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Granted: 1975-03-04
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Expires: 1988-06-24
Abstract
Abstract The invention is a process for upgrading the thermostability of light metal hydrides, particularly substantially non-solvated, crystalline aluminum hydrides by contacting the hydride with an organic treating liquid having a small amount of water associated therewith at a maximum temperature of about 80* C., preferably at from about 40* to about 70* C., for a period of time and separating the so-treated product from the treating liquid.
Inventors
- 👤 Earl Thomas Niles
- 👤 Beverly A H Seaman
- 👤 Edwin J Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:15
CPC Classifications
C; C01; C01B; C01B6/00; C01B6/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
A PROCESS FOR INCREASING THE THERMOSTABILITY OF A SUBSTANTIALLY NON-SOLVATED ALUMINUM HYDRIDE WHICH COMPRISES; A. CONTACTING AT A TEMPERATURE OF FROM ABOUT 25*C. TO ABOUT 80*C. FOR A PERIOD OF AT LEAST ABOUT 24 HOURS A SUBSTANTIALLY NON-SOLVATED ALUMINUM HYDRIDE WITH A TREATING LIQUID SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE, ALKYLHYDRAZINES, ALKYLAMINES, HYDROCARBONS OR ALCOHOLS WHEREIN THE TREATING LIQUID HAS ASSOCIATED THEREWITH AT LEAST ABOUT 0.1 WEIGHT PER CENT WATER, B. SEPARATING THE SO-TREATED ALUMINUM HYDRIDE PRODUCT FROM THE TREATING LIQUID, AND C. DRYING SAID ALUMINUM HYDRIDE PRODUCT.
Claim 2
Dependent Claim
89 words
A PROCESS FOR INCREASING THE THERMOSTABILITY OF A SUBSTANTIALLY NON-SOLVATED ALUMINUM HYDRIDE WHICH COMPRISES; A. CONTACTING AT A TEMPERATURE OF FROM ABOUT 25*C. TO ABOUT 80*C. FOR A PERIOD OF AT LEAST ABOUT 24 HOURS A SUBSTANTIALLY NON-SOLVATED ALUMINUM HYDRIDE WITH A TREATING LIQUID SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE, ALKYLHYDRAZINES, ALKYLAMINES, HYDROCARBONS OR ALCOHOLS WHEREIN THE TREATING LIQUID HAS ASSOCIATED THEREWITH AT LEAST ABOUT 0.1 WEIGHT PER CENT WATER, B. SEPARATING THE SO-TREATED ALUMINUM HYDRIDE PRODUCT FROM THE TREATING LIQUID, AND C. DRYING SAID ALUMINUM HYDRIDE PRODUCT.
Claim 3
Dependent Claim
46 words
The process as defined in claim 1 wherein the temperature of contact of said aluminum hydride and said treating liquid is from about 40* to about 70* C., and said treating liquid has from about 0.4 to about 3 per cent by weight water associated therewith.
Claim 4
Dependent Claim
24 words
The process as defined in claim 1 wherein the treating liquid has a normal boiling point of from about 60* to about 100* C.
Claim 5
Dependent Claim
23 words
The process as defined in claim 1 wherein the weight proportions of said treating liquid:aluminum hydride range from about 1:99 to about 95:5.
Claim 6
Dependent Claim
40 words
The process as defined in claim 1 wherein the treating liquid is a member selected from the group consisting of hydrazine, alkylhydrazines and alkylamines, the alkyl groups of said alkylhydrazines and alkylamines containing from one to about four carbon atoms.
Claim 7
Dependent Claim
29 words
The process as defined in claim 1 wherein the aluminum hydride and treating liquid are maintained in contact for a period of from about 6 to about 20 days.
Claim 8
Dependent Claim
19 words
The process as defined in claim 1 wherein the aluminum hydride is a substantially non-solvated hexagonal, crystalline aluminum hYdride.
Claim 9
Dependent Claim
36 words
The process as defined in claim 1 wherein the aluminum hydride is a substantially non-solvated, hexagonal crystalline aluminum hydride having from about 0.1 to about 3 weight per cent of magnesium incorporated into its crystal lattice.
Claim 10
Dependent Claim
27 words
The process as defined in claim 2 wherein the treating liquid is a member selected from the group consisting of n-butylamine, hydrazine, benzene, ethanol, iso-butylamine and ethylenedihydrazine.
Claim 11
Dependent Claim
23 words
The process as defined in claim 2 wherein the weight proportions of said treating liquid:aluminum hydride ranges from about 30:70 to about 75:25.
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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |