Patent US4009007A successfully refreshed from Google Patents.
US4009007A
Expired / Lapsed
US
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Tantalum powder and method of making the same
Assignee: TANTALUM PRODUCTION Inc A DE CORP
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Filing: 1975-07-14
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Granted: 1977-02-22
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Expires: 1995-07-14
Abstract
Abstract Tantalum 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 400 ppm based on elemental phosphorus. In one embodiment, the flow properties of the powder are also improved.
Inventors
- 👤 Stanley S. Fry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:12
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/052; H01G9/0525; B; B22; B22F; B22F1/00; B22F1/12
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
25 words
A tantalum powder containing an added phosphorus-containing material in an amount equivalent to from about 5 to about 400 parts per million of elemental phosphorus.
Claim 2
Dependent Claim
25 words
A tantalum powder containing an added phosphorus-containing material in an amount equivalent to from about 5 to about 400 parts per million of elemental phosphorus.
Claim 3
Dependent Claim
15 words
A tantalum powder in accordance with claim 1 in which the powder particles are agglomerated.
Claim 4
Dependent Claim
15 words
A tantalum powder in accordance with claim 1 in which the powder particles are unagglomerated.
Claim 5
Dependent Claim
24 words
A tantalum powder in accordance with claim 2 in which said phosphorus-containing material is added to said tantalum powder prior to the agglomeration thereof.
Claim 6
Dependent Claim
23 words
A tantalum powder in accordance with claim 2 in which said phosphorus-containing material is added to said tantalum powder after the agglomeration thereof.
Claim 7
Dependent Claim
41 words
A tantalum powder in accordance with claim 2 in which at least a portion of said phosphorus-containing material is calcium orthophosphate; added after agglomeration in an amount equivalent to from about 20 to about 80 parts per million of elemental phosphorus.
Claim 8
Dependent Claim
18 words
A tantalum powder in accordance with claim 1 in which the phosphorus-containing material is free of metallic cations.
Claim 9
Dependent Claim
59 words
A tantalum powder in accordance with claim 2 in which a major portion of the phosphorus in said powder is obtained by the addition of a phosphorus-containing material having no metallic cations and a minor portion is obtained by the addition of calcium orthophosphate after agglomeration in an amount not exceeding about 80 parts per million of elemental phosphorus.
Claim 10
Dependent Claim
44 words
A tantalum 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 11
Dependent Claim
14 words
A tantalum anode prepared by pressing and sintering the tantalum powder of claim 1.
Claim 12
Dependent Claim
47 words
A tantalum anode prepared by pressing tantalum powder into the shape of an anode, adding to said pressed tantalum powder a phosphorus-containing material in an amount equivalent to from about 5 to about 400 parts per million of elemental phosphorus, and thereafter sintering said pressed tantalum powder.
Claim 13
Dependent Claim
47 words
A tantalum anode prepared by pressing tantalum powder into the shape of an anode, adding to said pressed tantalum powder a phosphorus-containing material in an amount equivalent to from about 5 to about 400 parts per million of elemental phosphorus, and thereafter sintering said pressed tantalum powder.
Claim 14
Independent Claim
32 words
A method of improving a tantalum powder which comprises adding to said powder an amount of a phosphrous-containing material corresponding to from about 5 to about 400 parts per million of phosphorus.
Claim 15
Independent Claim
32 words
A method of improving a tantalum powder which comprises adding to said powder an amount of a phosphrous-containing material corresponding to from about 5 to about 400 parts per million of phosphorus.
Claim 16
Dependent Claim
22 words
A method in accordance with claim 1 in which said tantalum powder is agglomerated prior to the addition of said phosphorus-containing material.
Claim 17
Dependent Claim
20 words
A method in accordance with claim 12 in which said phosphorus-containing material is added to said powder prior to agglomeration.
Claim 18
Dependent Claim
55 words
A method in accordance with claim 12 in which said phosphorus-containing material comprises a minor proportion of calcium orthophosphate and a larger proportion of a phosphorus-containing material having no metallic cations, said calcium orthophosphate being added after agglomeration in an amount equivalent to from about 20 to about 80 parts per million of elemental phosphorus.
Claim 19
Independent Claim
49 words
A method of improving a tantalum powder which comprises adding to said powder while it is in the form of tantalum hydride an amount of phosphorus-containing material corresponding to from about 5 to about 400 parts per million of phosphorus and thereafter converting said tantalum hydride to metallic tantalum.
Claim 20
Independent Claim
49 words
A method of improving a tantalum powder which comprises adding to said powder while it is in the form of tantalum hydride an amount of phosphorus-containing material corresponding to from about 5 to about 400 parts per million of phosphorus and thereafter converting said tantalum hydride to metallic tantalum.
Claim 21
Dependent Claim
19 words
A method in accordance with claim 16 in which said tantalum hydride is converted to metallic tantalum during agglomeration.
Claim 22
Dependent Claim
20 words
A method in accordance with claim 16 in which said tantalum hydride is converted to metallic tantalum and thereafter agglomerated.
Claim 23
Dependent Claim
19 words
A method of forming an improved tantalum anode which comprises pressing and sintering the tantalum powder of claim 1.
Claim 24
Independent Claim
53 words
A method of forming an improved tantalum anode which comprises pressing a tantalum powder into the shape of an aode, adding to said pressed tantalum powder to phosphorus-containing material in an amount equivalent to from about 5 to about 400 parts per million of elemental phosphorus, and thereafter sintering said pressed tantalum powder.
Claim 25
Independent Claim
53 words
A method of forming an improved tantalum anode which comprises pressing a tantalum powder into the shape of an aode, adding to said pressed tantalum powder to phosphorus-containing material in an amount equivalent to from about 5 to about 400 parts per million of elemental phosphorus, and thereafter sintering said pressed tantalum powder.
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) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |