Patent US3244480A successfully refreshed from Google Patents.
US3244480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of fibrous silicon nitride
Assignee: Individual
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Filing: 1964-03-03
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Granted: 1966-04-05
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Expires: 1984-03-03
Abstract
No abstract record available.
Inventors
- 👤 Robert C Johnson
- 👤 John K Alley
- 👤 Wilbur H Warwick
- 👤 Haskiel R Shell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:24
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/06; C01B21/068; C01B21/0685; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
A METHOD FOR PRODUCING SILICON NITRIDE BY REACTING AT AN ELEVATED TEMPERATURE GASEOUS NITROGEN WITH A SILICA MATERIAL AND A REDUCING AGENT CAPABLE OF REDUCING THE SIO2 CONTENT IN THE SILICA MATERIAL TO ELEMENTAL SILICON , THE IMPROVEMENT WHICH COMPRISES (A) MAINTAINING THIN LAYERS OF MATERIAL CONTAINING SAID SILICA MATERIAL AND SAID REDUCING AGENT IN A GASEOUS NITROGEN ENVIRONMENT DURING THE REACTION, WHICH LAYERS POSSESS LARGE SURFACE AREAS, WHEREBY VAPOROUS SILICON READILY FORMS OUTSIDE SAID LAYERS AND REACTS WITH SAID GASEOUS NITROGEN OUTSIDE LAYERS TO FORM SILICON NITRIDE FIBERS OUTSIDE SAID LAYERS, WHICH FIBERS DEPOSIT ON SAID LARGE SURFACE AREAS, AND (B) REMOVEING THE SAID DEPOSITED FIBERS FROM SAID LARGE SURFACE AREAS AT THE END OF THE REACTION.
Claim 2
Independent Claim
118 words
A METHOD FOR PRODUCING SILICON NITRIDE BY REACTING AT AN ELEVATED TEMPERATURE GASEOUS NITROGEN WITH A SILICA MATERIAL AND A REDUCING AGENT CAPABLE OF REDUCING THE SIO2 CONTENT IN THE SILICA MATERIAL TO ELEMENTAL SILICON , THE IMPROVEMENT WHICH COMPRISES (A) MAINTAINING THIN LAYERS OF MATERIAL CONTAINING SAID SILICA MATERIAL AND SAID REDUCING AGENT IN A GASEOUS NITROGEN ENVIRONMENT DURING THE REACTION, WHICH LAYERS POSSESS LARGE SURFACE AREAS, WHEREBY VAPOROUS SILICON READILY FORMS OUTSIDE SAID LAYERS AND REACTS WITH SAID GASEOUS NITROGEN OUTSIDE LAYERS TO FORM SILICON NITRIDE FIBERS OUTSIDE SAID LAYERS, WHICH FIBERS DEPOSIT ON SAID LARGE SURFACE AREAS, AND (B) REMOVEING THE SAID DEPOSITED FIBERS FROM SAID LARGE SURFACE AREAS AT THE END OF THE REACTION.
Claim 3
Dependent Claim
84 words
A REACTION VESSEL FOR FORMING SILICON NITRIDE FIBERS UNDER ELEVATED TEMPERATURES BY REACTING THEREIN A SILICA MATERIAL WITH GASEOUS NITROGEN AND A REDUCING AGNET CAPABLE OF REDUCING, UNDER ELEVATED TEMPERATURES, THE SIO2 CONTENT IN SAID SILICA MATERIAL TO ELEMENTAL SILICON WHICH COMPRISES (A) AN ELONGATED, SUBSTANTIALLY CLOSED VESSEL, (B) A STACK OF SUBSTANTIALLY PARALLEL, SPACED-APART, DISKLIKE SUPPORT MEMBERS WITHIN SAID VESSEL, EACH MEMBER EXTENDING TRANSVERSELY ACROSS THE INTERIOR OF THE VESSEL, (C) EACH MEMEBER CAPABLE OF SUPPORTING THEREON A MIXTURE CONTAINING SAID SILICA COMPOUND,
Claim 4
Dependent Claim
84 words
A REACTION VESSEL FOR FORMING SILICON NITRIDE FIBERS UNDER ELEVATED TEMPERATURES BY REACTING THEREIN A SILICA MATERIAL WITH GASEOUS NITROGEN AND A REDUCING AGNET CAPABLE OF REDUCING, UNDER ELEVATED TEMPERATURES, THE SIO2 CONTENT IN SAID SILICA MATERIAL TO ELEMENTAL SILICON WHICH COMPRISES (A) AN ELONGATED, SUBSTANTIALLY CLOSED VESSEL, (B) A STACK OF SUBSTANTIALLY PARALLEL, SPACED-APART, DISKLIKE SUPPORT MEMBERS WITHIN SAID VESSEL, EACH MEMBER EXTENDING TRANSVERSELY ACROSS THE INTERIOR OF THE VESSEL, (C) EACH MEMEBER CAPABLE OF SUPPORTING THEREON A MIXTURE CONTAINING SAID SILICA COMPOUND,
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) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |