Patent US6754485B1 successfully refreshed from Google Patents.
US5082491A
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Tantalum powder with improved capacitor anode processing characteristics
Assignee: V Tech Corp
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Filing: 1990-09-06
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Granted: 1992-01-21
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Expires: 2010-09-06
Abstract
Abstract Ingot-derived and sodium-reduced agglomerated tantalum powders having improved flow characteristics and lead pull-out strength that find particular utility in manufacture of anodes for capacitors. Powder size distribution is in the range of -60 to +400 mesh, preferably -60 to +250 mesh, containing less than 5 wt % powder above the upper and below the lower range limits.
Inventors
- 👤 Carlos F. Rerat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:32
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/052; H01G9/0525
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
28 words
An agglomerated tantalum powder having a screen size distribution of minus 60 mesh to plus 400 mesh containing less than 5 weight percent of minus 400 mesh material.
Claim 2
Dependent Claim
28 words
An agglomerated tantalum powder having a screen size distribution of minus 60 mesh to plus 400 mesh containing less than 5 weight percent of minus 400 mesh material.
Claim 3
Dependent Claim
32 words
An agglomerated tantalum powder according to claim 1 having a screen size distribution of minus 60 mesh to plus 250 mesh containing less than 5 weight percent of minus 250 mesh material.
Claim 4
Dependent Claim
25 words
An agglomerated tantalum powder according to claim 1 in which at least a portion of the agglomerated tantalum powder is composed of re-agglomerated tantalum powder.
Claim 5
Dependent Claim
19 words
An agglomerated tantalum powder according to claim 2 containing less than 5 weight percent of plus 60 mesh material.
Claim 6
Dependent Claim
26 words
An agglomerated tantalum powder for capacitors having improved flow characteristics and lead wire pull out strength, and having a screen size distribution according to claim 2.
Claim 7
Dependent Claim
22 words
An agglomerated tantalum powder for capacitors having improved flow characteristics and containing less than 5 weight percent of minus 400 mesh material.
Claim 8
Dependent Claim
22 words
An agglomerated tantalum powder for capacitors having improved flow characteristics and containing less than 5 weight percent of minus 400 mesh material.
Claim 9
Dependent Claim
62 words
An agglomerated tantalum powder for capacitor anodes that consists essentially of a particle size distribution in the range of -60 and +400 mesh, having less than 10 wt % powder outside of said range, and exhibiting a flowability of at least 0.2 g/sec according to Japanese Specification JIS-Z2502-1979 at an orifice size of 2.0 mm and a vibration amplitude of 0.18 mm.
Claim 10
Dependent Claim
62 words
An agglomerated tantalum powder for capacitor anodes that consists essentially of a particle size distribution in the range of -60 and +400 mesh, having less than 10 wt % powder outside of said range, and exhibiting a flowability of at least 0.2 g/sec according to Japanese Specification JIS-Z2502-1979 at an orifice size of 2.0 mm and a vibration amplitude of 0.18 mm.
Claim 11
Dependent Claim
32 words
The powder set forth in claim 7 consisting essentially of a particle size distribution in the range of -60 and +250 mesh, with less than 10 wt % outside of said range.
Claim 12
Dependent Claim
26 words
An agglomerated tantalum powder according to any of claims 1 to 8 and having a BET surface area of at least 0.25 square meters per gram.
Claim 13
Dependent Claim
22 words
Pressed and sintered tantalum anodes for capacitors that comprise the tantalum powder of any of claims 1 to 8 in their manufacture.
Claim 14
Dependent Claim
30 words
Pressed and sintered anodes with a specific capacity of at least 15,000 micro-farad-volts per gram that comprise the tantalum powder of any of claims 1 to 8 in their manufacture.
Claim 15
Dependent Claim
15 words
Pressed and sintered anodes that comprise the tantalum powder of claim 9 in their manufacture.
Claim 16
Dependent Claim
19 words
Solid electrolytic capacitors that comprise anodes of claim 10 and having a wet-to-solid capacitance loss not exceeding 3 percent.
Claim 17
Dependent Claim
19 words
Solid electrolytic capacitors that comprise anodes of claim 11 and having a wet-to-solid capacitance loss not exceeding 3 percent.
Claim 18
Dependent Claim
19 words
Solid electrolytic capacitors that comprise anodes of claim 12 and having a wet-to-solid capacitance loss not exceeding 3 percent.
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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) | 1995-01-20 | 1995-07-22 | 1996-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-20 | 1999-07-22 | 2000-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-20 | 2003-07-22 | 2004-01-21 | $7700.00 | Window Closed / Lapsed |