Patent US4609971A successfully refreshed from Google Patents.
US4609971A
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US
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Electrolytic capacitor with polymer conductor
Assignee: Philips North America LLC
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Filing: 1983-08-11
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Granted: 1986-09-02
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Expires: 2003-08-11
Abstract
Abstract A solid electrolytic capacitor includes a conductive polymer electrolyte. The electrolyte may comprise p-doped polyacrylonitrile, polypyrrole, or polyacetylene.
Inventors
- 👤 Jesse S. Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:56
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022; H01G9/025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
62 words
A dry electrolytic capacitor comprising: a metal anode foil; an insulating oxide layer disposed on the surfaces of the anode foil; a solid body of a conductive p-doped polyacrylonitrile polymer electrolyte, disposed in intimate physical contact with outer surfaces of the oxide layer; anode contact means electrically connected to the anode foil; and cathode contact means electrically connected to the polymer body.
Claim 2
Dependent Claim
62 words
A dry electrolytic capacitor comprising: a metal anode foil; an insulating oxide layer disposed on the surfaces of the anode foil; a solid body of a conductive p-doped polyacrylonitrile polymer electrolyte, disposed in intimate physical contact with outer surfaces of the oxide layer; anode contact means electrically connected to the anode foil; and cathode contact means electrically connected to the polymer body.
Claim 3
Dependent Claim
30 words
The capacitor of claim 1 wherein the polymer includes an anionic dopant selected from the group consisting of iodine, bromine, group I metal perchlorates, group I tetrafluoroborates, and arsenic pentafluoride.
Claim 4
Dependent Claim
16 words
The capacitor of claim 2 wherein the conductive polymer includes lithium perchlorate as an anionic dopant.
Claim 5
Dependent Claim
20 words
The capacitor of claim 3 wherein the cathode contact means comprising a metal cathode foil disposed within the polymer body.
Claim 6
Dependent Claim
23 words
The capacitor of claim 3 wherein the cathode contact means comprise an electrical contact layer disposed on a surface of the polymer body.
Claim 7
Dependent Claim
25 words
The capacitor of claim 5 wherein the contact layer comprises one or more layers of conductive paint disposed on the surface of the polymer body.
Claim 8
Dependent Claim
16 words
The capacitor of claim 6 wherein the contact layer comprises a layer containing conductive carbon particles.
References Cited (Backward Citations)
US3955126A
Cited
US4222903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |