Patent US3843360A successfully refreshed from Google Patents.
US3843360A
Expired / Lapsed
US
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Sintered tantalum for electrodes of capacitors
Assignee: Resonac Holdings Corp
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Filing: 1971-05-20
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Granted: 1974-10-22
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Expires: 1991-05-20
Abstract
Abstract 1. IN A METHOD OF MAKING A TANTALUM ABODE COMPRISING (A) COMPRESSION MOLDING A TANTALUM POWER, (B) SINTERING THE RESULTING MOLDED PRODUCT UNDER VACUUM TO FORM A POROUS SINTERED MASS, (C) SUBJECTING SAID POROUS SINTERED MASS TO ANODIC OXIDATION TO FORM A DIELECTRIC OXIDE FILM HAVING A THICKNESS OF 400-4,::: A, AND (D) FILLING THE PORES OF THE CATHODE SIDE OF SAID SINTERED MASS WITH MAGNESIUM DIOXIDE, THE IMPROVEMENT WHEREIN SAID TANTALUM POOWER HAS AN AVERAGE PARTICLE DIAMETER BY THE AIR PERMEABILITY METHOD F ($) AND A BULK DENSITY D (G./CM.3)RELATIONSHIP SUCH THAT WHEN 12$F>8.4, 3.6$2.8, WHEN 8.4$F>7.8, 3.4$D>2.3, WHEN 7.8$F>7.2, 3.2$D$1.8, OR WHEN 7.2$F>2, 2.8$D$1.5.
Inventors
- 👤 T Hanaoka
- 👤 H Naito
- 👤 M Kobayashi
- 👤 N Ohishi
- 👤 A Komatsu
- 👤 K Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:20
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/052; B; B22; B22F; B22F3/00; B22F3/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IN A METHOD OF MAKING A TANTALUM ABODE COMPRISING (A) COMPRESSION MOLDING A TANTALUM POWER, (B) SINTERING THE RESULTING MOLDED PRODUCT UNDER VACUUM TO FORM A POROUS SINTERED MASS, (C) SUBJECTING SAID POROUS SINTERED MASS TO ANODIC OXIDATION TO FORM A DIELECTRIC OXIDE FILM HAVING A THICKNESS OF 400-4,::: A, AND (D) FILLING THE PORES OF THE CATHODE SIDE OF SAID SINTERED MASS WITH MAGNESIUM DIOXIDE, THE IMPROVEMENT WHEREIN SAID TANTALUM POOWER HAS AN AVERAGE PARTICLE DIAMETER BY THE AIR PERMEABILITY METHOD F ($) AND A BULK DENSITY D (G./CM.3)RELATIONSHIP SUCH THAT
Claim 2
Dependent Claim
92 words
IN A METHOD OF MAKING A TANTALUM ABODE COMPRISING (A) COMPRESSION MOLDING A TANTALUM POWER, (B) SINTERING THE RESULTING MOLDED PRODUCT UNDER VACUUM TO FORM A POROUS SINTERED MASS, (C) SUBJECTING SAID POROUS SINTERED MASS TO ANODIC OXIDATION TO FORM A DIELECTRIC OXIDE FILM HAVING A THICKNESS OF 400-4,::: A, AND (D) FILLING THE PORES OF THE CATHODE SIDE OF SAID SINTERED MASS WITH MAGNESIUM DIOXIDE, THE IMPROVEMENT WHEREIN SAID TANTALUM POOWER HAS AN AVERAGE PARTICLE DIAMETER BY THE AIR PERMEABILITY METHOD F ($) AND A BULK DENSITY D (G./CM.3)RELATIONSHIP SUCH THAT
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |