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US5023213A
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Precursors in the preparation of transition metal nitrides and transition metal carbonitrides and their reaction intermediates
Assignee: United States Department of Energy
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Filing: 1986-12-09
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Granted: 1991-06-11
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Expires: 2006-12-09
Abstract
Abstract A process for making ammonolytic precursors to nitride and carbonitride ceramics. Extreme reaction conditions are not required and the precursor is a powder-like substance that produces ceramics of improved purity and morphology upon pyrolysis.
Inventors
- 👤 Leon Maya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:54
CPC Classifications
C; C07; C07F; C07F9/00; C01; C01B; C01B21/00; C01B21/06; C01B21/0615; C01B21/0617; C01B21/062; C01B21/076; C01B21/0763; C01B21/082; C01B21/0828; C01B21/087; C01B21/092; C01B21/0923; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
27 words
A composition comprising: a transition metal bound to; a first ligand selected from the group inorganic amide and imide ligands; and a second ligand being acetylide ligands.
Claim 2
Dependent Claim
27 words
A composition comprising: a transition metal bound to; a first ligand selected from the group inorganic amide and imide ligands; and a second ligand being acetylide ligands.
Claim 3
Dependent Claim
11 words
The composition of claim 1 wherein said acetylide ligand is terminal.
Claim 4
Dependent Claim
16 words
The composition of claim 1 wherein said acetylide ligand is bridging between said transition metal molecules.
Claim 5
Dependent Claim
20 words
The composition of claim 1 wherein said transition metal is selected from the group vanadium, tungsten, molybdenum, titanium and niobium.
Claim 6
Dependent Claim
35 words
The precursor of claim 1 having the formula M n (C.tbd.CH) x (NH 2 ) n-x wherein M is a transition metal and n is the oxidation state of M and x is a variable.
Claim 7
Dependent Claim
16 words
A process for making ceramics comprising: pyrolyzing the precursor of claim 1 in an inert atmosphere.
Claim 8
Dependent Claim
16 words
A process for making ceramics comprising: pyrolyzing the precursor of claim 2 in an inert atmosphere.
Claim 9
Dependent Claim
16 words
A process for making ceramics comprising: pyrolyzing the precursor of claim 3 in an inert atmosphere.
Claim 10
Dependent Claim
16 words
A process for making ceramics comprising: pyrolyzing the precursor of claim 4 in an inert atmosphere.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-10 | 1994-12-10 | 1995-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-10 | 1998-12-10 | 1999-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-10 | 2002-12-10 | 2003-06-11 | $7700.00 | Window Closed / Lapsed |