US2935668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical capacitors
Assignee: Sprague Electric Co
•
Filing: 1956-06-28
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Granted: 1960-05-03
•
Expires: 1976-06-28
Abstract
No abstract record available.
Inventors
- 👤 Robinson Preston
- 👤 David B Peck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:37
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A CAPACITOR HAVING ELECTRODES INSULATED FROM EACH OTHER BY A CONTINUOUS DIELECTRIC SPACER IAMINATED FROM A POROUS NON-THERMOPLASTIC LAYER AND A NON-POROUS THERMOPLASTIC RESIN LAYER, THE TWO LAYERS HAVING A THICKNESS RATIO OF FROM 1:2 TO 4:2 WITH THE THERMOPLASTIC LAYER FROM 0.0001 TO 0.002 INCH THICK, AND THE THERMOPLASTIC LAYER BEING STRAIN-FREE AND PARTIALLY INTERSPERSED IN THE POROUS LAYER.
Claim 2
Dependent Claim
60 words
A CAPACITOR HAVING ELECTRODES INSULATED FROM EACH OTHER BY A CONTINUOUS DIELECTRIC SPACER IAMINATED FROM A POROUS NON-THERMOPLASTIC LAYER AND A NON-POROUS THERMOPLASTIC RESIN LAYER, THE TWO LAYERS HAVING A THICKNESS RATIO OF FROM 1:2 TO 4:2 WITH THE THERMOPLASTIC LAYER FROM 0.0001 TO 0.002 INCH THICK, AND THE THERMOPLASTIC LAYER BEING STRAIN-FREE AND PARTIALLY INTERSPERSED IN THE POROUS LAYER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |