Patent US2853540A successfully refreshed from Google Patents.
US2853540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas insulated electrical apparatus
Assignee: General Electric Co
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Filing: 1954-01-06
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Granted: 1958-09-23
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Expires: 1974-01-06
Abstract
No abstract record available.
Inventors
- 👤 Camilli Guglielmo
- 👤 Tseng W Liao
- 👤 Ralph E Plump
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:33
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/08; H01F27/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
AN ELECTRICAL APPARATUS COMPRISING A CLOSED CONTAINER AND ELECTRIC DEVICE WITHIN SAID CONTAINER OF THE TYPE WHICH DURING USE CREATES A NON-UNIFORM ELECTRASTATIC FIELD WITHIN SAID CONTAINER AND HAVING ELEMENTS OF DIFERENT POTENTIAL SPACED FROM EACH OTHER AT LEAST ONE-HALF INCH AND A GASEOUS DIELECTRIC FILLING SAID CONTAINER AND CONSISTING ESSENTIALLY OF A MIXTURE OF 5 TO 85 PERCENT BY VOLUME OF NITROGEN AND 15 TO 95 PERCENT OF A GAS SELECTED FROM THE GROUP CONSISTING OF SULFUR HEXAFLUORIDE AND DECAFLUOROBUTANE, OCTAFLUOROPROPANE, OCTAFLUOROCYCLOBUTYL ETHER-1,4, AND OCTAFLUOROCYCLOBUTANE.
Claim 2
Dependent Claim
86 words
AN ELECTRICAL APPARATUS COMPRISING A CLOSED CONTAINER AND ELECTRIC DEVICE WITHIN SAID CONTAINER OF THE TYPE WHICH DURING USE CREATES A NON-UNIFORM ELECTRASTATIC FIELD WITHIN SAID CONTAINER AND HAVING ELEMENTS OF DIFERENT POTENTIAL SPACED FROM EACH OTHER AT LEAST ONE-HALF INCH AND A GASEOUS DIELECTRIC FILLING SAID CONTAINER AND CONSISTING ESSENTIALLY OF A MIXTURE OF 5 TO 85 PERCENT BY VOLUME OF NITROGEN AND 15 TO 95 PERCENT OF A GAS SELECTED FROM THE GROUP CONSISTING OF SULFUR HEXAFLUORIDE AND DECAFLUOROBUTANE, OCTAFLUOROPROPANE, OCTAFLUOROCYCLOBUTYL ETHER-1,4, AND OCTAFLUOROCYCLOBUTANE.
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) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |