US4548798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser synthesis of refractory oxide powders
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1984-04-16
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Granted: 1985-10-22
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Expires: 2004-04-16
Abstract
Abstract The present invention relates to a method for the production of refractory oxide powders by pyrolyzing with laser energy a metal- and oxygen-containing organic chemical species characterized by the following properties: (a) some or all of the organic fragments (ligands) are bound to the metal by one or more metal-oxygen bonds, (b) the chemical species is able to absorb laser energy, preferably from a CO 2 laser, in a vibrational mode, (c) the chemical species can be obtained in a gas state, at a temperature below the decomposition temperature.
Inventors
- 👤 Gary W. Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:16
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; C01B13/18; B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/121; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B35/00; C01B35/08; C01B35/10; C01B35/1027; C01B35/1036; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/07; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
112 words
A continuous process for producing refractory oxide powders comprising: (a) obtaining a boron, silicon or metal containing compound including organic components in a gaseous state below its decomposition temperature such that the organic components are bound to the boron, silicon or metal by one or more boron, silicon or metal oxygen bonds, (b) irradiating said compound in the substantial absence of elemental oxygen with a laser such that the energy is absorbed in a vibrational mode at such an intensity so as to cause pyrolytic decomposition in a continuous manner, in the substantial absence of exothermic chemistry, so as to produce a refractory oxide powder, and (c) collecting said refractory oxide powder.
Claim 2
Dependent Claim
112 words
A continuous process for producing refractory oxide powders comprising: (a) obtaining a boron, silicon or metal containing compound including organic components in a gaseous state below its decomposition temperature such that the organic components are bound to the boron, silicon or metal by one or more boron, silicon or metal oxygen bonds, (b) irradiating said compound in the substantial absence of elemental oxygen with a laser such that the energy is absorbed in a vibrational mode at such an intensity so as to cause pyrolytic decomposition in a continuous manner, in the substantial absence of exothermic chemistry, so as to produce a refractory oxide powder, and (c) collecting said refractory oxide powder.
Claim 3
Dependent Claim
82 words
The process of claim 1 wherein said obtaining step is performed such that said compound is a binary alkoxide or binary fluorinated alkoxide of an element selected from the group consisting of boron, silicon aluminum, a metal from Group II (Be, Mg, Ca, Sr, Ba), a transition metal from Group III (Sc, Y, La), a transition metal from Group IV, (Ti, Zr, Hf), a transition metal from Group V (V, Nb, Ta) and a transition metal from Group VI (Cr, Mo, W).
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein said alkoxide is a titanium alkoxide.
Claim 5
Dependent Claim
17 words
The process of claim 3 wherein said metal alkoxide is Ti[OCH(CH 3 ) 2 ] 4 .
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein said refractory oxide is titanium dioxide.
Claim 7
Dependent Claim
21 words
The process of claim 6 wherein said alkoxide has a vapor pressure above 100 torr at temperature below the decomposition temperature.
Claim 8
Dependent Claim
27 words
The process of claim 1 wherein said obtaining step is performed such that said compound is selected from either a metal acetylacetonate or a metal fluorinated acetylacetonate.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein said laser has a power intensity between 400 and 4,000 W/cm 2 .
Claim 10
Dependent Claim
15 words
The process of claim 1 wherein said alkoxide contains from 1 to 5 carbon atoms.
Claim 11
Dependent Claim
15 words
The process of claim 9 wherein said aloxide contains from 3 to 4 carbon atoms.
Claim 12
Dependent Claim
13 words
The process of claim 1 wherein said laser is a CO 2 laser.
References Cited (Backward Citations)
US4343687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |