Patent US4555268A successfully refreshed from Google Patents.
US4555268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving handling properties of a flaked tantalum powder composition
Assignee: Cabot Corp
•
Filing: 1984-12-18
•
Granted: 1985-11-26
•
Expires: 2004-12-18
Abstract
Abstract A method for improving the handling characteristics of a flaked tantalum powder composition comprising heat treating the flaked powder component of the composition in order to pre-agglomerate the flaked component prior to mixing it with the granular tantalum powder component of the composition.
Inventors
- 👤 Marlyn F. Getz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:31
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/052; H01G9/0525; B; B22; B22F; B22F1/00; B22F1/06; B22F1/14; B22F1/148; B22F2998/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
89 words
A method of preparing a tantalum powder composition comprising: heat treating a flaked tantalum powder at a temperature ranging from about 1250° C. to about 1550° C. for a period ranging from about 5 to about 120 minutes in order to pre-agglomerate the flaked powder; mixing the pre-agglomerated flaked tantalum powder with a granular tantalum powder to form a tantalum powder composition; agglomerating said tantalum powder composition at a temperature of about 1250° C. to about 1550° C. for a period of from about 5 to about 120 minutes.
Claim 2
Independent Claim
89 words
A method of preparing a tantalum powder composition comprising: heat treating a flaked tantalum powder at a temperature ranging from about 1250° C. to about 1550° C. for a period ranging from about 5 to about 120 minutes in order to pre-agglomerate the flaked powder; mixing the pre-agglomerated flaked tantalum powder with a granular tantalum powder to form a tantalum powder composition; agglomerating said tantalum powder composition at a temperature of about 1250° C. to about 1550° C. for a period of from about 5 to about 120 minutes.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein the flaked tantalum powder is heat treated at a temperature ranging from about 1350° C. to about 1550° C.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein the flaked tantalum powder is heat treated at a temperature ranging from about 1450° C. to about 1525° C.
Claim 5
Dependent Claim
24 words
The method of claim 2 wherein the flaked tantalum powder is heat treated for a period ranging from about 15 to about 45 minutes.
Claim 6
Dependent Claim
24 words
The method of claim 3 wherein the flaked tantalum powder is heat treated for a period ranging from about 25 to about 35 minutes.
Claim 7
Dependent Claim
48 words
The method of claim 1 wherein the flaked tantalum powder that is heat treated has a BET surface area of about 0.20 to about 0.40 m 2 /gm produced by deforming a granular tantalum powder having a particle size ranging from about 10 microns to about 44 microns.
Claim 8
Dependent Claim
19 words
The method of claim 6 wherein the granular tantalum powder has a particle size less than about 10 microns.
Claim 9
Dependent Claim
36 words
The method of claim 7 wherein the pre-agglomerated flaked tantalum powder is mixed with the granular tantalum powder to form a composition comprising from about 20 to about 40 percent by weight of flaked tantalum powder.
Claim 10
Dependent Claim
18 words
The method of claim 1 wherein the tantalum composition is an electron beam ingot-derived agglomerated tantalum powder composition.
Claim 11
Dependent Claim
99 words
The method of claim 1 comprising: heat treating a flaked tantalum powder having a BET surface area of about 0.30 m 2 /gm, produced by deforming a granular tantalum powder having a particle size ranging from about 10 to about 44 microns, at a temperature ranging from about 1350° C. to about 1550° C. for a period ranging from about 15 to about 45 minutes; and mixing the pre-agglomerated flaked tantalum powder with a granular tantalum powder having a particle size less than about 10 microns to form a composition comprising about 70 percent by weight of granular powder.
Claim 12
Dependent Claim
12 words
The tantalum powder composition prepared according to the method of claim 1.
Claim 13
Dependent Claim
12 words
The tantalum powder composition prepared according to the method of claim 10.
References Cited (Backward Citations)
US3779716A
Cited
US4441927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |