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US3688015A Expired / Lapsed US ⏱️ 0.0 years remaining

Conductive aluminum tubes for metal-enclosed, compressed gas-insulated conductors and the like

Assignee: ABB Inc USA
•
Filing: 1972-01-14
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Granted: 1972-08-29
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Expires: 1992-01-14
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Abstract

Abstract The confronting interior surfaces of the metallic central conductor and housing of an isolated phase bus system are treated by degreasing the surfaces of the central conductor and housing, etching the degreased surfaces, washing the etched surfaces, contacting the washed surfaces with an oxidizing agent, washing the resulting surfaces and drying the resulting treated surfaces under dust-free conditions. The process provides surfaces which are devoid of all particles which can deteriorate or otherwise destroy the dielectric integrity of the isolated phase bus while at the same time having surfaces of higher coefficients of emissivity as compared with conventional untreated surfaces thereby reducing the operating temperatures of the bus run.

Inventors

  • 👤 Howard W Graybill

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 22:47
CPC Classifications
H; H02; H02G; H02G5/00; H02G5/06; H02G5/063

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 42 words
An isolated phase bus system comprising a tubular conductive housing and a central conductor concentrically arranged within said housing wherein the housing and conductor are aluminum and wherein the inner confronting surfaces of the housing and conductor are uniformLy etched and particle-free.
Claim 2
Dependent Claim 42 words
An isolated phase bus system comprising a tubular conductive housing and a central conductor concentrically arranged within said housing wherein the housing and conductor are aluminum and wherein the inner confronting surfaces of the housing and conductor are uniformLy etched and particle-free.
Claim 3
Dependent Claim 21 words
The isolated phase bus system of claim 1 wherein the space between the housing and the conductor is filled with SF6.

References Cited (Backward Citations)

US2795490A Cited
US2872301A Cited
US3145178A Cited
US3367798A Cited
US3345450A Cited
US3391243A Cited
US3639671A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-08-29 1976-02-28 1976-08-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-08-29 1980-02-28 1980-08-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-08-29 1984-02-28 1984-08-29 $7700.00 Window Closed / Lapsed

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