Patent US2668936A successfully refreshed from Google Patents.
US2668936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical condenser
Assignee: Sprague Electric Co
•
Filing: 1948-05-26
•
Granted: 1954-02-09
•
Expires: 1968-05-26
Abstract
No abstract record available.
Inventors
- 👤 Robinson Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:46
CPC Classifications
H; H01; H01G; H01G2/00; H01G2/14; H01G9/00; H01G9/004; H01G9/04; H01G9/042; H01G9/045; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
AN ELECTROSTATIC CONDENSER OF HIGH VOLUMETRIC EFFICIENCY COMPRISING ELECTRODE FOILS OF OPPOSITE POLARITY EACH ELECTRODE HAVING A THICKNESS OF LESS THAN 0.0005 INCH, SAID FOIL SURFACES BEING METAL OXIDE-FREE AND SANDWICHED BETWEEN LAYERS LESS THAN 0.0005 INCH THICK OF DIELECTRIC MATERIAL, AND SAID FOILS BEING SUPERIMPOSED SUBSTANTIALLY EXACTLY OVER EACH OTHER SO THAT THEIR EDGES ARE ADJACENT, AT LEAST ONE OF THE FOILS BEING OF FILMFORMING METAL AND HAVING ON ITS ADJACENT EDGES AN IN SITU ELECTROLYTICALLY-FORMED OXIDE OF SAID FILM-FORMING METAL.
Claim 2
Dependent Claim
82 words
AN ELECTROSTATIC CONDENSER OF HIGH VOLUMETRIC EFFICIENCY COMPRISING ELECTRODE FOILS OF OPPOSITE POLARITY EACH ELECTRODE HAVING A THICKNESS OF LESS THAN 0.0005 INCH, SAID FOIL SURFACES BEING METAL OXIDE-FREE AND SANDWICHED BETWEEN LAYERS LESS THAN 0.0005 INCH THICK OF DIELECTRIC MATERIAL, AND SAID FOILS BEING SUPERIMPOSED SUBSTANTIALLY EXACTLY OVER EACH OTHER SO THAT THEIR EDGES ARE ADJACENT, AT LEAST ONE OF THE FOILS BEING OF FILMFORMING METAL AND HAVING ON ITS ADJACENT EDGES AN IN SITU ELECTROLYTICALLY-FORMED OXIDE OF SAID FILM-FORMING METAL.
References Cited (Backward Citations)
US1846844A
Cited
GB474063A
Cited
US2214876A
Cited
US2222195A
Cited
US2296616A
Cited
US2258031A
Cited
US2393966A
Cited
US2408910A
Cited
GB584851A
Cited
US2374449A
Cited
US2421652A
Cited
US2447386A
Cited
US2408790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-08 | 1957-08-10 | 1958-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-08 | 1961-08-10 | 1962-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-08 | 1965-08-10 | 1966-02-09 | $7700.00 | Window Closed / Lapsed |