US3638084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energy storage capacitor
Assignee: Sprague Electric Co
•
Filing: 1970-05-14
•
Granted: 1972-01-25
•
Expires: 1990-05-14
Abstract
Abstract The capacitor includes at least one pair of electrodes separated by high-energy storage material consisting essentially of 85-95 percent by volume of an antiferroelectric ceramic and 5-15 percent by volume of nonreactive glass fired into a coherent body.
Inventors
- 👤 Ian Burn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:17
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/129; H01G4/1209; H01G4/1236
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
The capacitor of claim 1 wherein said high temperature ceramic material is lead zirconate.
Claim 2
Dependent Claim
13 words
The capacitor of claim 1 wherein said high temperature material is lead hafnate.
Claim 3
Dependent Claim
25 words
The capacitor of claim 1 wherein said glass consists essentially of: CdO 36% Al2O3 1% Bi2O3 23% B2O3 5% PbO 25% SiO2 5% ZnO 5%
Claim 4
Dependent Claim
21 words
The capacitor of claim 1 wherein said electrodes are selected from the group consisting of silver, gold, platinum and silver-platinum alloys.
References Cited (Backward Citations)
US2293077A
Cited
US3495996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |