US4177322A
Expired / Lapsed
US
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Method of improving high voltage insulating devices
Assignee: Dow Silicones Corp
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Filing: 1978-04-28
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Granted: 1979-12-04
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Expires: 1998-04-28
Abstract
Abstract The ability of high voltage insulating devices, such as electrical transmission line suspension insulators, to resist the development of excessive leakage currents is improved by coating the surface with specific silicone fluids. The fluids have a composition of a general formula: ##STR1##
Inventors
- 👤 Gary R. Homan
- 👤 Chi-Long Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:40
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/46; H01B19/00; H01B19/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/2962; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
163 words
A method of improving an electrical insulating function of an outer surface of a solid electrical insulator wherein the improvement comprises coating the surface with a composition consisting essentially of of a general formula: ##STR14## wherein x has an average value of at least 2; y and z each have an average value of 0 to 98; x plus y plus z is equal to a value of from 8 to 200 inclusive; y and z cannot be 0 simultaneously; when x, y, and z each have an average value greater than 0, a ratio of x to y to z is about 7 to 4 to 1; when y is 0 then the ratio of x to z is from 0.3/1 to 7/1 inclusive and x plus z has a value less than 100; and when z is 0 then the ratio of x to y is from 0.3/1 to 7/1 inclusive and x plus y has a value less than 100.
Claim 2
Independent Claim
163 words
A method of improving an electrical insulating function of an outer surface of a solid electrical insulator wherein the improvement comprises coating the surface with a composition consisting essentially of of a general formula: ##STR14## wherein x has an average value of at least 2; y and z each have an average value of 0 to 98; x plus y plus z is equal to a value of from 8 to 200 inclusive; y and z cannot be 0 simultaneously; when x, y, and z each have an average value greater than 0, a ratio of x to y to z is about 7 to 4 to 1; when y is 0 then the ratio of x to z is from 0.3/1 to 7/1 inclusive and x plus z has a value less than 100; and when z is 0 then the ratio of x to y is from 0.3/1 to 7/1 inclusive and x plus y has a value less than 100.
Claim 3
Dependent Claim
36 words
The method of claim 1 where x, y, and z are in the ratio of about 7 to 4 to 1 and the average value of x plus y plus z is from 50 to 200.
Claim 4
Dependent Claim
9 words
The method of claim 1 where z is zero.
Claim 5
Dependent Claim
27 words
The method of claim 3 where x and y are in the ratio of from 0.6/1 to 4/1, and x plus y is from 8 to 25.
Claim 6
Dependent Claim
23 words
The method of claim 3 where x and y are in the ratio of about 1.5/1 and x plus y is about 8.
Claim 7
Dependent Claim
9 words
The method of claim 1 where y is zero.
Claim 8
Dependent Claim
27 words
The method of claim 6 where x and z are in the ratio of from 0.6/1 to 4/1 and x plus z is from 8 to 25.
Claim 9
Dependent Claim
23 words
The method of claim 7 where x and z are in the ratio of about 1.5/1 and x plus z is about 8.
Claim 10
Dependent Claim
18 words
The method of claim 1 wherein the outer surface of the solid electrical insulator is a cured elastomer.
Claim 11
Dependent Claim
12 words
The method of claim 9 wherein the cured elastomer is a polydiorganosiloxane.
Claim 12
Dependent Claim
30 words
The method of claim 9 wherein z is zero, x and y are in the ratio of from 0.6/1 to 4/1 and x plus y is from 8 to 25.
Claim 13
Dependent Claim
30 words
The method of claim 9 wherein y is zero, x and z are in the ratio of from 0.6/1 to 4/1 and x plus z is from 8 to 25.
Claim 14
Dependent Claim
30 words
The method of claim 10 wherein z is zero, x and y are in the ratio of from 0.6/1 to 4/1 and x plus y is from 8 to 25.
Claim 15
Dependent Claim
30 words
The method of claim 10 wherein y is zero, x and z are in the ratio of from 0.6/1 to 4/1 and x plux z is from 8 to 25.
Claim 16
Dependent Claim
11 words
A solid electrical insulator prepared by the method of claim 1.
Claim 17
Dependent Claim
11 words
A solid electrical insulator prepared by the method of claim 9.
Claim 18
Dependent Claim
11 words
A solid electrical insulator prepared by the method of claim 10.
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) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |