Patent US3878313A successfully refreshed from Google Patents.
US3878313A
Expired / Lapsed
US
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Pre-assembled cable termination
Assignee: 3M Co
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Filing: 1974-10-04
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Granted: 1975-04-15
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Expires: 1994-10-04
Abstract
Abstract A pre-assembled oil-filled termination for high voltage electrical cables comprises a rubbery liner fitting around the cable-end and sealed within a tubular insulating shell, the space between shell and liner being filled with insulating liquid.
Inventors
- 👤 Wayne F Varner
- 👤 Gerald A Wyatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:00
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/02; H02G15/06; H02G15/064; H02G15/068
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
72 words
A high voltage cable termination comprising a rigid tubular insulating body, a rubbery sleeve lying within said body and hermetically sealed thereto around both open ends thereof, and an insulating liquid enclosed within the space between said sleeve and body, said sleeve including a thick-walled portion, having a constant internal diameter, adjacent one end, and a thin-walled portion, with gradually increasing internal diameter, extending from said thick-walled portion to the other end.
Claim 2
Dependent Claim
72 words
A high voltage cable termination comprising a rigid tubular insulating body, a rubbery sleeve lying within said body and hermetically sealed thereto around both open ends thereof, and an insulating liquid enclosed within the space between said sleeve and body, said sleeve including a thick-walled portion, having a constant internal diameter, adjacent one end, and a thin-walled portion, with gradually increasing internal diameter, extending from said thick-walled portion to the other end.
Claim 3
Dependent Claim
32 words
Termination of claim 1 wherein said thick-walled portion includes a semiconductive component in the form of a stress cone expanding outwardly from said internal diameter in the direction of said thin-walled portion.
Claim 4
Dependent Claim
34 words
Termination of claim 2 wherein said semiconductive component is hermetically sealed to the end of the insulating body by a centrally perforate metal base supporting said body and making grounding contact with said component.
Claim 5
Dependent Claim
25 words
Termination of claim 1 wherein said thin-walled portion is hermetically sealed to the end of the insulating body by a centrally perforate metal end cap.
Claim 6
Dependent Claim
27 words
Termination of claim 4 wherein is included a terminal connector lug extending through the centrally perforate cap, and retaining means for said lug supported by said cap.
Claim 7
Dependent Claim
29 words
Termination of claim 5 wherein said retaining means comprises an elastomeric washer surrounding said lug and a compression cup attached to said cap for holding said washer under compression.
Claim 8
Dependent Claim
18 words
Termination of claim 6 wherein said retaining means includes clamping means for preventing axial movement of said lug.
Claim 9
Dependent Claim
23 words
Termination of claim 7 wherein said clamping means includes a spring washer slotted radially inwardly to provide spring tabs for gripping said lug.
Claim 10
Dependent Claim
19 words
Termination of claim 8 wherein said tabs are offset from the plane of the periphery of said spring washer.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |