US4084965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Columbium powder and method of making the same
Assignee: Fansteel Inc
•
Filing: 1977-01-05
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Granted: 1978-04-18
•
Expires: 1997-01-05
Abstract
Abstract Columbium powder capable of producing anodes of improved electrical capacitance is prepared by the addition of phosphorus-containing materials in amounts from about 5 to about 600 ppm based on elemental phosphorus.
Inventors
- 👤 Stanley S. Fry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:10
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/042; C; C22; C22C; C22C32/00; C22C32/0089; H01G9/048; H01G9/052; H01G9/0525
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
25 words
A columbium powder containing an added phosphorus-containing material in an amount equivalent to from about 5 to about 600 parts per million of elemental phosphorus.
Claim 2
Dependent Claim
25 words
A columbium powder containing an added phosphorus-containing material in an amount equivalent to from about 5 to about 600 parts per million of elemental phosphorus.
Claim 3
Dependent Claim
15 words
A columbium powder in accordance with claim 1 in which the powder particles are agglomerated.
Claim 4
Dependent Claim
15 words
A columbium powder in accordance with claim 1 in which the powder particles are unagglomerated.
Claim 5
Dependent Claim
24 words
A columbium powder in accordance with claim 2 in which said phosphorus-containing material is added to said columbium powder prior to the agglomeration thereof.
Claim 6
Dependent Claim
23 words
A columbium powder in accordance with claim 2 in which said phosphorus-containing material is added to said columbium powder after the agglomeration thereof.
Claim 7
Dependent Claim
18 words
A columbium powder in accordance with claim 1 in which the phosphorus-containing material is free of metallic cations.
Claim 8
Dependent Claim
44 words
A columbium powder in accordance with claim 1 in which at least a major portion of said phosphorus-containing material is added in the form of an orthophosphate compound of the group consisting of ammonium orthophosphate, ammonium hydrogen orthophosphate, ammonium di-hydrogen orthophosphate, and orthophosphoric acid.
Claim 9
Dependent Claim
14 words
A columbium anode prepared by pressing and sintering the columbium powder of claim 1.
Claim 10
Dependent Claim
47 words
A columbium anode prepared by pressing columbium powder into the shape of an anode, adding to said pressed columbium powder a phosphorus-containing material in an amount equivalent to from about 5 to about 600 parts per million of elemental phosphorus, and thereafter sintering said pressed columbium powder.
Claim 11
Dependent Claim
47 words
A columbium anode prepared by pressing columbium powder into the shape of an anode, adding to said pressed columbium powder a phosphorus-containing material in an amount equivalent to from about 5 to about 600 parts per million of elemental phosphorus, and thereafter sintering said pressed columbium powder.
Claim 12
Independent Claim
31 words
A method for improving a columbium powder which comprises adding to said powder an amount of phosphorus-containing material corresponding to from about 5 to about 600 parts per million of phosphorus.
Claim 13
Independent Claim
31 words
A method for improving a columbium powder which comprises adding to said powder an amount of phosphorus-containing material corresponding to from about 5 to about 600 parts per million of phosphorus.
Claim 14
Dependent Claim
22 words
A method in accordance with claim 10 in which said columbium powder is agglomerated prior to the addition of said phosphorus-containing material.
Claim 15
Dependent Claim
20 words
A method in accordance with claim 10 in which said phosphorus-containing material is added to said powder prior to agglomeration.
Claim 16
Independent Claim
49 words
A method of improving a columbium powder which comprises adding to said powder while it is in the form of columbium hydride an amount of phosphorus-containing material corresponding to from about 5 to about 600 parts per million of phosphorus and thereafter converting said columbium hydride to metallic columbium.
Claim 17
Independent Claim
49 words
A method of improving a columbium powder which comprises adding to said powder while it is in the form of columbium hydride an amount of phosphorus-containing material corresponding to from about 5 to about 600 parts per million of phosphorus and thereafter converting said columbium hydride to metallic columbium.
Claim 18
Dependent Claim
19 words
A method in accordance with claim 13 in which said columbium hydride is converted to metallic columbium during agglomeration.
Claim 19
Dependent Claim
20 words
A method in accordance with claim 13 in which said columbium hydride is converted to metallic columbium and thereafter agglomerated.
Claim 20
Dependent Claim
19 words
A method of forming an improved columbium anode which comprises pressing and sintering the columbium powder of claim 1.
Claim 21
Independent Claim
53 words
A method of forming an improved columbium anode which comprises pressing a columbium powder into the shape of an anode, adding to said pressed columbium powder a phosphorus-containing material in an amount equivalent to from about 5 to about 600 parts per million of elemental phosphorus, and thereafter sinterng said pressed columbium powder.
Claim 22
Independent Claim
53 words
A method of forming an improved columbium anode which comprises pressing a columbium powder into the shape of an anode, adding to said pressed columbium powder a phosphorus-containing material in an amount equivalent to from about 5 to about 600 parts per million of elemental phosphorus, and thereafter sinterng said pressed columbium powder.
Claim 23
Dependent Claim
28 words
The method of claim 17 wherein said sintered and pressed columbium powder is thereafter anodized in dilute aqueous phosphoric acid at a temperature between 0° and 10° C.
References Cited (Backward Citations)
US3259475A
Cited
US3647415A
Cited
US3742369A
Cited
US3655425A
Cited
US3748106A
Cited
US3934179A
Cited
US4009007A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |