Patent US5051280A successfully refreshed from Google Patents.
US5051280A
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Low temperature synthesis of alkali metal niobates and tantalates
Assignee: Eastman Kodak Co
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Filing: 1990-10-01
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Granted: 1991-09-24
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Expires: 2010-10-01
Abstract
Abstract A new synthetic method for the production of alkali metal niobates and tantalates is disclosed. The method involves the pyrolysis of a stoichiometric salt of an alkali metal and a niobium or tantalum complex of a bidentate or tridentate ligand. These salts are stable and, since the alkali metal and the niobioum or tantalum are already present in stoichiometric amounts, the resulting material comprises a substantially pure alkali metal niobate or tantalate.
Inventors
- 👤 Yann Hung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:24
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/02; C23C18/12; C23C18/1204; C23C18/1208; C23C18/1216; C01; C01G; C01G35/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
62 words
A method for making an alkali metal niobate or tantalate, said method comprising the steps of: a) forming a salt of an alkali metal and a monovalent niobium or tantalum containing complex, said complex comprising niobium or tantalum complexed with three bidentate ligands or two tridentate ligands; and b) pyrolyzing said salt so as to form said alkali metal niobate or tantalate.
Claim 2
Independent Claim
62 words
A method for making an alkali metal niobate or tantalate, said method comprising the steps of: a) forming a salt of an alkali metal and a monovalent niobium or tantalum containing complex, said complex comprising niobium or tantalum complexed with three bidentate ligands or two tridentate ligands; and b) pyrolyzing said salt so as to form said alkali metal niobate or tantalate.
Claim 3
Dependent Claim
106 words
A method according to claim 1 wherein said salt has the structure: ##STR6## wherein M is an alkali metal selected from the group consisting of lithium, potassium, and sodium; R1 through R4 are independently selected from the group consisting of alkyl having 1 to 5 carbon atoms, alkoxy wherein the alkyl portion has from 1 to 5 carbon atoms, halogen such as fluorine, chlorine, bromine and iodine, cyano and nitro or R1 and R4 can be hydrogen and R2 and R3, taken together, can represent a saturated or unsaturated substituted or unsubstituted carbocyclic or heterocyclic ring structure containing from about 6 to 13 carbon and heteroatoms.
Claim 4
Dependent Claim
13 words
A method according to claim 1 wherein said salt has the structure: ##STR7##
Claim 5
Dependent Claim
13 words
A method according to claim 1 wherein said salt has the structure: ##STR8##
Claim 6
Independent Claim
72 words
A method of forming a layer of an alkali metal niobate or tantalate, said method comprising the steps of: a) coating a solution of a salt of an alkali metal and a monovalent niobium or tantalum containing complex on a support, said complex comprising niobium or tantalum complexed with three bidentate ligands or two tridentate ligands; and b) pyrolyzing said salt so as to form said alkali metal niobate or tantalate layer.
Claim 7
Independent Claim
72 words
A method of forming a layer of an alkali metal niobate or tantalate, said method comprising the steps of: a) coating a solution of a salt of an alkali metal and a monovalent niobium or tantalum containing complex on a support, said complex comprising niobium or tantalum complexed with three bidentate ligands or two tridentate ligands; and b) pyrolyzing said salt so as to form said alkali metal niobate or tantalate layer.
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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) | 1994-09-23 | 1995-03-25 | 1995-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-23 | 1999-03-25 | 1999-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-23 | 2003-03-25 | 2003-09-24 | $7700.00 | Window Closed / Lapsed |