Patent US3257501A successfully refreshed from Google Patents.
US3257501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cleaning electrical insulator constructions
Assignee: Westinghouse Electric Corp
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Filing: 1961-04-20
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Granted: 1966-06-21
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Expires: 1981-04-20
Abstract
No abstract record available.
Inventors
- 👤 Louis E Sauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:54
CPC Classifications
H; H01; H01B; H01B17/00; H01B17/32; H01B17/26; H01B17/28; H01B17/52; H01B17/525
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
67 words
A WEATHERRPROOF CASING SHELL FOR A TERMINAL BUSHING HAVING INTERIORLY-DISPOSED LONGITUDINALLY-EXTENDING STEPPED LANDS ADAPTED TO SUPPORT CONCENTRICALLY ARRANGED CONDENSER TUBES, AND SAID CASING SHELL HAVING A HELICALLY DISPOSED CONTINUOUS WEATHER SHED, THE WEATHER SHED INCLUDING A PLURALITY OF SPACED HELICAL SHEDS HAVING PRESELECTED SLOPES WHICH OPTIMIZE THE WET VOLTAGE WITHSTAND OF THE SHELL, THE HELICAL SHEDS HAVING PRESELECTED WIDTHS WHEREBY THE LEAKAGE DISTANCE MEASURED ALONG THE ROOT
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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) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |