US3850764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a solid tantalum capacitor
Assignee: Kyocera Avx Components Corp
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Filing: 1974-04-11
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Granted: 1974-11-26
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Expires: 1994-04-11
Abstract
Abstract A method is disclosed for forming a solid tantalum capacitor wherein the cathode is manganese dioxide formed by pyrolysis. The first pyrolysis is performed at a temperature of between 225*C and 300*C while all subsequent pyrolysis treatments are at a temperature of between 175*C and 225*C with each such subsequent pyrolysis temperature being at least 25*C less than the first pyrolysis temperature.
Inventors
- 👤 J Smith
- 👤 A Herczog
- 👤 J Power
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:55
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/0029; H01G9/0036; Y; Y10; Y10T; Y10T29/00; Y10T29/43
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
133 words
THE METHOD OF FORMING A SOLID TANTALUM CAPACITOR COMPRISING THE STEPS OF PROCIDING A POROUS TANTALUM SLUG, ANODIZING THE SURFACE OF SAID TANTALUM SLUG TO FORM A DIELECTRIC LAYER THEREOF, DEPOSITING A COATING OF MANGANESE NITRATE OVER SAID DIELECTRIC LAYER, HEATING THE COMPOSITE SO FORMED TO A TEMPERATURE OF BETWEEN 225*C. AND ABOUT 300*C. FOR A PERIOD OF TIME SUFFICIENT TO CONVERT SAID MANGANESE NITRATE TO A LAYER MANGANESE DIOXIDE, THEN SUBJECTING SAID COMPOSITE TO REANODIZATION DEPOSITING A SECOND COATING OF MANGANESE NITRATE OVER THE EXPOSED SURFACE OF SAID COMPOSITE, AND REHEATING SAID COMPOSITE AT A TEMPERATURE OF BETWEEN 175*C AND 225*C. FOR A PERIOD OF TIME SUFFICIENT OF CONVERT SAID SECOD COATING OF MANGANESE NITRATE TO MANGANESE DIOXIDE, SAID REHEATING TEMPERATURE BEING AT LEAST 25*C. LESS THAN THE FIRST HEATING TEMPERA ATURE
Claim 2
Independent Claim
133 words
THE METHOD OF FORMING A SOLID TANTALUM CAPACITOR COMPRISING THE STEPS OF PROCIDING A POROUS TANTALUM SLUG, ANODIZING THE SURFACE OF SAID TANTALUM SLUG TO FORM A DIELECTRIC LAYER THEREOF, DEPOSITING A COATING OF MANGANESE NITRATE OVER SAID DIELECTRIC LAYER, HEATING THE COMPOSITE SO FORMED TO A TEMPERATURE OF BETWEEN 225*C. AND ABOUT 300*C. FOR A PERIOD OF TIME SUFFICIENT TO CONVERT SAID MANGANESE NITRATE TO A LAYER MANGANESE DIOXIDE, THEN SUBJECTING SAID COMPOSITE TO REANODIZATION DEPOSITING A SECOND COATING OF MANGANESE NITRATE OVER THE EXPOSED SURFACE OF SAID COMPOSITE, AND REHEATING SAID COMPOSITE AT A TEMPERATURE OF BETWEEN 175*C AND 225*C. FOR A PERIOD OF TIME SUFFICIENT OF CONVERT SAID SECOD COATING OF MANGANESE NITRATE TO MANGANESE DIOXIDE, SAID REHEATING TEMPERATURE BEING AT LEAST 25*C. LESS THAN THE FIRST HEATING TEMPERA ATURE
Claim 3
Dependent Claim
29 words
The method of claim 1 further comprising the steps of applying a layer of carbon over the manganese dioxide coating and a layer of silver over the carbon layer.
Claim 4
Dependent Claim
17 words
The method of claim 2 further comprising the step of attaching a lead to said silver layer.
Claim 5
Dependent Claim
15 words
The method of claim 3 further comprising the step of encapsulating the composite so formed.
Claim 6
Dependent Claim
39 words
The method of claim 1 wherein the step of subjecting said composite to reanodization comprises placing the composite in the anodization bath and passing therethrough a DC current at substantially the same level as used during the anodizing step.
Claim 7
Dependent Claim
19 words
The method of claim 1 further comprising the step of subjecting said composite to reanodization after said reheating step.
Claim 8
Dependent Claim
70 words
The method of claim 1 further comprising the steps of depositing a still further coating of manganese nitrate over the exposed surface of said composite, and thereafter reheating said composite at a temperature of between 175*C. and 225C. for a period of time sufficient to convert said still further coating of manganese nitrate to manganese dioxide, said latest reheating temperature being at least 25C. less than the first heating temperature.
Claim 9
Dependent Claim
20 words
The method of claim 7 further comprising the step of subjecting said composite to reanodization after said last reheating step.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |