US2590650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical condenser
Assignee: Sprague Electric Co
•
Filing: 1951-08-01
•
Granted: 1952-03-25
•
Expires: 1971-08-01
Abstract
No abstract record available.
Inventors
- 👤 Robinson Preston
- 👤 Colin C Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:53
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/14; H01G4/18; H01G4/32; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
AN ELECTRICAL CONDENSER COMPRISING TWO CONVOLUTELY WOUND, METAL, ELECTRODE FOILS, AT LEAST ONE OF SAID ELECTRODE FOILS BEING INSULATED ON THE FLAT SURFACES THEREOF WITH A COATING OF POLYTETRAFLUOROETHYLENE AND AT THE EDGES AND CORNERS THEREOF WITH AN ADHERENT IN SITU FORMED LAYER OF THE PHTHALOCYANINE OF THE METAL OF SAID FOIL, SAID LAYER BEING NOT GREATER THAN .0005" IN THICKNESS.
Claim 2
Dependent Claim
61 words
AN ELECTRICAL CONDENSER COMPRISING TWO CONVOLUTELY WOUND, METAL, ELECTRODE FOILS, AT LEAST ONE OF SAID ELECTRODE FOILS BEING INSULATED ON THE FLAT SURFACES THEREOF WITH A COATING OF POLYTETRAFLUOROETHYLENE AND AT THE EDGES AND CORNERS THEREOF WITH AN ADHERENT IN SITU FORMED LAYER OF THE PHTHALOCYANINE OF THE METAL OF SAID FOIL, SAID LAYER BEING NOT GREATER THAN .0005" IN THICKNESS.
Claim 3
Dependent Claim
96 words
A PROCESS OF PREPARAING AN ELECTRICAL CONDENSER WHICH COMPRISES ASSEMBLING A CONDENSER SECTION OF METAL ELECTRODE FOILS, AT LEAST ONE HALF OF WHICH BEAR A DIELECTRIC COATING UPON THEIR FLAT SURFACES, AND THEN EXPOSING SAID SECTION TO THE VAPORS OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHTHALIMIDE, ORTHO-CYANO-BENZONITRILES AND SUBSTTITUTED DERIVATIVES THEREOF, AT TEMPERATURES BETWEEN ABOUT 200 AND 500* C., UNTIL AN ADHERENT LAYER OF THE PHTHALOCYANINE OF THE METLA COMPOSING SAID FOILS HAS BEEN BUILT UP TO A THICKNESS OF UP TO ABOUT .0005" AT THE EXPOSED, UNINSULATED, METAL SURFACES OF SAID FOILS.
Claim 4
Dependent Claim
96 words
A PROCESS OF PREPARAING AN ELECTRICAL CONDENSER WHICH COMPRISES ASSEMBLING A CONDENSER SECTION OF METAL ELECTRODE FOILS, AT LEAST ONE HALF OF WHICH BEAR A DIELECTRIC COATING UPON THEIR FLAT SURFACES, AND THEN EXPOSING SAID SECTION TO THE VAPORS OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHTHALIMIDE, ORTHO-CYANO-BENZONITRILES AND SUBSTTITUTED DERIVATIVES THEREOF, AT TEMPERATURES BETWEEN ABOUT 200 AND 500* C., UNTIL AN ADHERENT LAYER OF THE PHTHALOCYANINE OF THE METLA COMPOSING SAID FOILS HAS BEEN BUILT UP TO A THICKNESS OF UP TO ABOUT .0005" AT THE EXPOSED, UNINSULATED, METAL SURFACES OF SAID FOILS.
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) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |