US3588643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated impregnated capacitor
Assignee: Sprague Electric Co
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Filing: 1969-11-12
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Granted: 1971-06-28
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Expires: 1989-11-12
Abstract
Abstract A CONVOLUTELY WOUND METALLIZED CAPACITOR, FULLY IMPOREGANTED WITH A LIQUID DIELECTRIC, IS TREATED WITH A POLYISOCYANATE SUCH THAT THE IMPREGNANT ON THE SURFACE OF THE CAPACITOR SECTION IS SUBJECTED TO A NONRADICAL REACTION SO AS TO PROVIDE A TOUGH POLYMER SKIN OF CONTROLLE THICKNESS AROUND THE SECTION. THE PREFERRED IMPREGNANT IS CASTOR OIL WHICH IS REACTED WITH A POLYISOCYANATE TO FORM THE SKIN.
Inventors
- 👤 Sidney D Ross
- 👤 Franklin D Frantz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:14
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |