Patent US4162227A successfully refreshed from Google Patents.
US4162227A
Expired / Lapsed
US
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Dielectric gas mixtures containing sulfur hexafluoride
Assignee: United States Department of Energy
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Filing: 1976-02-24
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Granted: 1979-07-24
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Expires: 1996-02-24
Abstract
Abstract Electrically insulating gaseous media of unexpectedly high dielectric strength comprised of mixtures of two or more dielectric gases are disclosed wherein the dielectric strength of at least one gas in each mixture increases at less than a linear rate with increasing pressure and the mixture gases are present in such proportions that the sum of their electrical discharge voltages at their respective partial pressures exceeds the electrical discharge voltage of each individual gas at the same temperature and pressure as that of the mixture.
Inventors
- 👤 Chathan M. Cooke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:54
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/16; H01B3/18; H01B3/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
An electrically insulating gaseous mixture consisting of sulfur hexafluoride and hexafluoroethane, said gases being present in such proportions that the sum of their electrical discharge voltages at their respective partial pressures in said mixture exceeds the electrical discharge voltage of each at the same temperature and pressure as that of said mixture.
Claim 2
Dependent Claim
52 words
An electrically insulating gaseous mixture consisting of sulfur hexafluoride and hexafluoroethane, said gases being present in such proportions that the sum of their electrical discharge voltages at their respective partial pressures in said mixture exceeds the electrical discharge voltage of each at the same temperature and pressure as that of said mixture.
References Cited (Backward Citations)
US2221670A
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US2989577A
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US3154592A
Cited
US3281521A
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US3390091A
Cited
US3506774A
Cited
US3650955A
Cited
US4071461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-23 | 1983-01-22 | 1983-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-23 | 1987-01-22 | 1987-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-23 | 1991-01-22 | 1991-07-24 | $7700.00 | Window Closed / Lapsed |