US3684929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic capacitor anode comprising oxide filmed hollow bodies
Assignee: Mallinckrodt Chemical Works
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Filing: 1969-07-31
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Granted: 1972-08-15
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Expires: 1989-07-31
Abstract
Abstract An anode for an electrolytic capacitor is fabricated by forming an electrically integral porous mass of particles which have cores with a discontinuous coating of a valve metal thereon and the coating has an exposed outer surface. At least a substantial portion of the inner surface of the valve metal coating is exposed to increase the exposed surface area of the valve metal in the mass. The exposed valve metal surfaces are then anodized.
Inventors
- 👤 Robert F Leifield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:28
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/042
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
29 words
An anode as set forth in claim 1 wherein the valve metal is selected from the group consisting of niobium, tantalum, aluminum, tungsten, hafnium, titanium, zirconium, and alloys thereof.
Claim 2
Dependent Claim
25 words
An anode as set forth in claim 1 wherein the thickness of the valve metal forming said bodies is not greater than about 8 microns.
Claim 3
Dependent Claim
22 words
An anode as set forth in claim 1 wherein the size of said hollow bodies is not greater than about 160 microns.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |