Patent US3892840A successfully refreshed from Google Patents.
US3892840A
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Method of producing an oxygen containing silicon compound
Assignee: Danfoss AS
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Filing: 1974-01-10
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Granted: 1975-07-01
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Expires: 1994-01-10
Abstract
Abstract The invention relates to a method for producing an oxygen containing silicon compound free of silicon dioxide. This is accomplished by keeping the partial pressure of the oxygen at the reaction temperature lower than 10 16 atmospheres. In one embodiment the atmosphere consists of nitrogen and a small amount of oxygen in some form such as carbon monoxide. In other embodiments nitrogen may be replaced by hydrogen or an inert gas.
Inventors
- 👤 Jorgen Abildtrup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:25
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/0821; C01B21/0823; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573; C04B35/58; C04B35/584; C04B35/591
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
93 words
A METHOD OF PRODUCING SHAPED ELEMENTS OF SILICON OXYNITRIDE ESSENTIALLY FREE OF SIO2, WHICH COMPRISES FORMING A SILICAFREE POWDER COMPACT CONSISTING ESSENTIALLY OF POWDERED SILICON AND HEATING THE COMPACT AT A TEMPERATURE IN THE RANGE 1200*C TO 1600*C AND UNDER A GASEOUS ATMOSPHERE CONSISTING ESSENTIALLY OF NITROGEN AND FREE OXYGEN, FOR A PERIOD OF FROM 1-3 HOURS, WHERE THE GASEOUS ATMOSPHERE CONTAINS AN AMOUNT OF FREE OXYGEN GAS SUFFICIENT TO MAINTAIN THE PARTIAL PRESSURE OF OXYGEN IN THE REACTION ZONE DURING THE REACTION PERIOD LOWER THAN 10**-16 ATMOSPHERES BUT GREATER THAN 10**26 ATMOSPHERES.
Claim 2
Independent Claim
93 words
A METHOD OF PRODUCING SHAPED ELEMENTS OF SILICON OXYNITRIDE ESSENTIALLY FREE OF SIO2, WHICH COMPRISES FORMING A SILICAFREE POWDER COMPACT CONSISTING ESSENTIALLY OF POWDERED SILICON AND HEATING THE COMPACT AT A TEMPERATURE IN THE RANGE 1200*C TO 1600*C AND UNDER A GASEOUS ATMOSPHERE CONSISTING ESSENTIALLY OF NITROGEN AND FREE OXYGEN, FOR A PERIOD OF FROM 1-3 HOURS, WHERE THE GASEOUS ATMOSPHERE CONTAINS AN AMOUNT OF FREE OXYGEN GAS SUFFICIENT TO MAINTAIN THE PARTIAL PRESSURE OF OXYGEN IN THE REACTION ZONE DURING THE REACTION PERIOD LOWER THAN 10**-16 ATMOSPHERES BUT GREATER THAN 10**26 ATMOSPHERES.
Claim 3
Dependent Claim
50 words
A method according to claim 1, wherein the compact is heated at a temperature in the range 1400*C to 1500*C in a gaseous atmosphere consisting essentially of nitrogen and free oxygen, wherein the partial pressure of said free oxygen is below 10 19 atmospheres but greater than 10 26 atmospheres.
References Cited (Backward Citations)
US2968530A
Cited
US3356513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |