US3700975A
Expired / Lapsed
US
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Double layer capacitor with liquid electrolyte
Assignee: AT&T Inc
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Filing: 1971-11-12
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Granted: 1972-10-24
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Expires: 1991-11-12
Abstract
Abstract A capacitor utilizing the space charge polarization effect is described. The device employs a liquid electrolyte, resulting in a high capacitance-to-volume ratio, and a higher voltage than usually found in such devices. The capacitor is intended primarily for use in filter applications in transistor circuits.
Inventors
- 👤 Alexander Duane Butherus
- 👤 Kenneth Russ Newby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:53
CPC Classifications
H; H01; H01G; H01G11/00; H01G11/04; H01G11/22; H01G11/30; H01G11/50; H01G11/54; H01G11/58; H01G11/60; H01G11/62; H01G11/06; H01G11/32; Y; Y02; Y02E; Y02E60/00; Y02E60/13
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
51 words
The capacitor of claim 1 in which said first electrode is an anode having a maximum resistivity of 1 ohm-centimeter and consists essentially of at least one member selected from the group consisting of carbon, nonstoichiometric electronically conducting metal oxides, transition metal nitrides, transition metal borides, and finely divided metallic platinum.
Claim 2
Dependent Claim
12 words
The capacitor of claim 2 in which said first electrode is carbon.
Claim 3
Dependent Claim
37 words
The capacitor of claim 1 in which said second electrode is a cathode and consists essentially of at least one element selected from the group consisting of Group IA and Group IIA elements of the Periodic Table.
Claim 4
Dependent Claim
12 words
The capacitor of claim 4 in which said second electrode is lithium.
Claim 5
Dependent Claim
24 words
The capacitor of claim 1 in which said nonaqueous solvent is aprotic and has a dielectric constant of at least 30, relative to vacuum.
Claim 6
Dependent Claim
30 words
The capacitor of claim 6 in which said solvent is at least one member selected from the group consisting of propylene carbonate, dimethyl sulfoxide, dimethyl sulfite, tetrahydrofuran, nitromethane, and butyrolacetone.
Claim 7
Dependent Claim
22 words
The capacitor of claim 1 in which the cation of said solute consists essentially of the same element as said second electrode.
Claim 8
Dependent Claim
50 words
The capacitor of claim 8 in which the first electrode is carbon and the anion of said solute has an effective ionic radius of at least 2.4 Angstroms and is at least one selected from the group consisting of PF6 , BF4 , BH4 , AlH4 , and CNS .
Claim 9
Dependent Claim
12 words
The capacitor of claim 8 in which the cation is Li .
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |