US4714800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stress control/insulating composite article with an outer surface having convolutions and electric power cable terminated therewith
Assignee: Raychem Ltd
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Filing: 1986-06-24
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Granted: 1987-12-22
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Expires: 2006-06-24
Abstract
Abstract A tubular article has an outer component of insulating material having a convoluted outer surface, and an inner component of stress grading material. In another embodiment, a tubular article has an outer component of insulating material having an outer surface that is convoluted along part of its length and shedded along another part of its length. The articles may be of heat-shrinkable polymeric material. The articles are particularly useful for terminating high voltage electric cables, and in the manufacture of electrical insulators.
Inventors
- 👤 Alan D. Atkins
- 👤 Kenneth Elliott
- 👤 John S. T. Looms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:59
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/02; H02G15/06; H02G15/064; H02G15/068; H01; H01B; H01B17/00; H01B17/32; H01B17/42; H01C; H01C7/00; H01C7/10; H01C7/12
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
75 words
A generally tubular article comprising an outer component of electrically insulating material having an outer surface extending longitudinally thereof said outer surface having along at least a part of its length a convoluted portion in the form of periodic protrusions and troughs, said protrusions having a peak-to-peak separation and a peak-to-trough height of about 15% and about 6% respectively of the outer diameter of the article; and an inner component of electrically stress grading material.
Claim 2
Dependent Claim
75 words
A generally tubular article comprising an outer component of electrically insulating material having an outer surface extending longitudinally thereof said outer surface having along at least a part of its length a convoluted portion in the form of periodic protrusions and troughs, said protrusions having a peak-to-peak separation and a peak-to-trough height of about 15% and about 6% respectively of the outer diameter of the article; and an inner component of electrically stress grading material.
Claim 3
Dependent Claim
19 words
An article according to claim 1, wherein said convoluted portion extends along substantially the whole length of the article.
Claim 4
Dependent Claim
106 words
A generally tubular article comprising an outer component of electrically insulating material having an outer surface extending longitudinally thereof, said outer surface having along part of its length of a convoluted portion in the form of periodic protrusions and troughs, said protrusions having a peak-to-peak separation and a peak-to-trough height of about 15% and about 6% respectively of the outer diameter of the article, and along another part of its length a portion with a shedded configuration, each shed having a profile such that its lateral dimension is at least two times greater than its longitudinal dimension; and an inner component of electrically stress grading material.
Claim 5
Dependent Claim
106 words
A generally tubular article comprising an outer component of electrically insulating material having an outer surface extending longitudinally thereof, said outer surface having along part of its length of a convoluted portion in the form of periodic protrusions and troughs, said protrusions having a peak-to-peak separation and a peak-to-trough height of about 15% and about 6% respectively of the outer diameter of the article, and along another part of its length a portion with a shedded configuration, each shed having a profile such that its lateral dimension is at least two times greater than its longitudinal dimension; and an inner component of electrically stress grading material.
Claim 6
Dependent Claim
21 words
An article according to claim 1 or claim 3 wherein the stress grading component is sustantially co-terminous with the insulating component.
Claim 7
Dependent Claim
18 words
An article according to claim 1 or claim 3, wherein said two components are integral with one another.
Claim 8
Dependent Claim
20 words
An article according to claim 1 or claim 3, wherein at least part of said outer surface is substantially cylindrical.
Claim 9
Dependent Claim
21 words
An article according to claim 1 or claim 3, wherein the insulating material forming said outer surface is substantially electrically non-tracking.
Claim 10
Dependent Claim
17 words
An article according to claim 1, wherein at least the insulating component is made from polymeric material.
Claim 11
Dependent Claim
12 words
An article according to claim 8, wherein the polymeric material is recoverable.
Claim 12
Dependent Claim
15 words
An article according to claim 3, wherein the outer component is made from polymeric material.
Claim 13
Dependent Claim
12 words
An article according to claim 10, wherein the polymeric material is recoverable.
Claim 14
Dependent Claim
15 words
An article according to claim 9 or claim 11, wherein the recoverable material is heat-shrinkable.
Claim 15
Dependent Claim
21 words
An article according to claim 9, wherein the convoluted portion of the insulating component remains convoluted after recovery of said component.
Claim 16
Dependent Claim
20 words
An article according to claim 1 or claim 3, wherein the inner surface of the insulating component is substantially smooth.
Claim 17
Dependent Claim
80 words
An electric power cable terminated by a generally tubular article comprising an outer component of electrically insulating material having an outer surface extending longitudinally thereof, said outer surface having along at least part of its length a convoluted portion in the form of periodic protrusions and troughs, said protrusions having a peak-to-peak separation and a peak-to-trough height of about 15% and about 6% respectively of the outer diameter of the article, and an inner component of electrically stress grading material.
Claim 18
Dependent Claim
80 words
An electric power cable terminated by a generally tubular article comprising an outer component of electrically insulating material having an outer surface extending longitudinally thereof, said outer surface having along at least part of its length a convoluted portion in the form of periodic protrusions and troughs, said protrusions having a peak-to-peak separation and a peak-to-trough height of about 15% and about 6% respectively of the outer diameter of the article, and an inner component of electrically stress grading material.
Claim 19
Dependent Claim
78 words
An electric insulator comprising a generally tubular article comprising an outer component of electrically insulating material having an outer surface extending longitudinally thereof, said outer surface having along at least part of its length a convoluted portion in the form of periodic protrusions and troughs, said protrusions having a peak-to-peak separation and a peak-to-trough height of about 15% and about 6% respectively of the outer diameter of the article and an inner component of electrically stress grading material.
Claim 20
Dependent Claim
78 words
An electric insulator comprising a generally tubular article comprising an outer component of electrically insulating material having an outer surface extending longitudinally thereof, said outer surface having along at least part of its length a convoluted portion in the form of periodic protrusions and troughs, said protrusions having a peak-to-peak separation and a peak-to-trough height of about 15% and about 6% respectively of the outer diameter of the article and an inner component of electrically stress grading material.
Claim 21
Dependent Claim
111 words
An electric power cable terminated by a generally tubular article comprising an outer component of electrically insulating material having an outer surface extending longitudinally thereof, said outer surface having along part of its length a convoluted portion in the form of periodic protrusions and troughs, said protrusions having a peak-to-peak separation and a peak-to-trough height of about 15% and about 6% respectively of the outer diameter of the article, and along another part of its length a portion with a shedded configuration, each shed having a profile such that is lateral dimension is at least two times greater than its longitudinal dimension, and an inner component of electrically stress grading material.
Claim 22
Dependent Claim
111 words
An electric power cable terminated by a generally tubular article comprising an outer component of electrically insulating material having an outer surface extending longitudinally thereof, said outer surface having along part of its length a convoluted portion in the form of periodic protrusions and troughs, said protrusions having a peak-to-peak separation and a peak-to-trough height of about 15% and about 6% respectively of the outer diameter of the article, and along another part of its length a portion with a shedded configuration, each shed having a profile such that is lateral dimension is at least two times greater than its longitudinal dimension, and an inner component of electrically stress grading material.
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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) | 1990-12-21 | 1991-06-22 | 1991-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-21 | 1995-06-22 | 1995-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-21 | 1999-06-22 | 1999-12-22 | $7700.00 | Window Closed / Lapsed |