Patent US2749490A successfully refreshed from Google Patents.
US2749490A
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Electrical condensers
Assignee: Sprague Electric Co
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Filing: 1952-10-22
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Granted: 1956-06-05
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Expires: 1972-10-22
Abstract
No abstract record available.
Inventors
- 👤 Robinson Preston
- 👤 David B Peck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:10
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/32; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
AN ELECTRICAL CAPACITOR COMPRISING CONVOLUTELY WOUND ELECTRODE ELEMENTS SEPARATED BY A COMPOSITE DIELECTRIC SPACING MATERIAL, SAID MATERIAL CONSISTING OF AT LEAST ONE CONTINUOUS FILM OF DISORIENTED POLYSTYRENE AND AT LEAST ONE PREDOMINANTLY ORIENTED FILM OF POLYETHYLENE TEREPHTHALATE ACID.
Claim 2
Dependent Claim
38 words
AN ELECTRICAL CAPACITOR COMPRISING CONVOLUTELY WOUND ELECTRODE ELEMENTS SEPARATED BY A COMPOSITE DIELECTRIC SPACING MATERIAL, SAID MATERIAL CONSISTING OF AT LEAST ONE CONTINUOUS FILM OF DISORIENTED POLYSTYRENE AND AT LEAST ONE PREDOMINANTLY ORIENTED FILM OF POLYETHYLENE TEREPHTHALATE ACID.
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) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |