US2991326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulation system for electrical apparatus containing liquid dielectrics
Assignee: Westinghouse Electric Corp
•
Filing: 1957-12-24
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Granted: 1961-07-04
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Expires: 1977-12-24
Abstract
No abstract record available.
Inventors
- 👤 James G Ford
- 👤 Frank A Sattler
- 👤 Swiss Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:38
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/323; H01B; H01B3/00; H01B3/18; H01B3/185; H01B3/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN ELECTRICAL APPARATUS, THE COMBINATION COMPRISING AN ELECTRICAL CONDUCTOR WINDING DEVELOPING HEAT DURING USE OF THE APPARATUS, CELLULOSIC INSULATION PRESENT IN THE APPARATUS AND IN CONTACT WITH THE WINDING AND NORMALLY BEING SUBJECT TO LOSS OF PHYSICAL STRENGTH WITH PASSAGE OF TIME AT THE TEMPERATURES DEVELOPED, A LIQUID DIELECTRIC CONSISTING ESSENTIALLY OF PETROLEUM OIL APPLIED TO THE WINDING AND TO THE CELLULOSIC INSULATION TO DISSIPATE THE HEAT DEVELOPED THEREIN, AND, IN THE LIQUID DIELECTRIC TO MAINTAIN THE PHYSICAL STRENGTH OF THE CELLULOSIC INSULATION, A NON-ACIDIC COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
89 words
IN ELECTRICAL APPARATUS, THE COMBINATION COMPRISING AN ELECTRICAL CONDUCTOR WINDING DEVELOPING HEAT DURING USE OF THE APPARATUS, CELLULOSIC INSULATION PRESENT IN THE APPARATUS AND IN CONTACT WITH THE WINDING AND NORMALLY BEING SUBJECT TO LOSS OF PHYSICAL STRENGTH WITH PASSAGE OF TIME AT THE TEMPERATURES DEVELOPED, A LIQUID DIELECTRIC CONSISTING ESSENTIALLY OF PETROLEUM OIL APPLIED TO THE WINDING AND TO THE CELLULOSIC INSULATION TO DISSIPATE THE HEAT DEVELOPED THEREIN, AND, IN THE LIQUID DIELECTRIC TO MAINTAIN THE PHYSICAL STRENGTH OF THE CELLULOSIC INSULATION, A NON-ACIDIC COMPOUND HAVING THE FORMULA
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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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |