US3711631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage multi-layer cylindrical devices
Assignee: Individual
•
Filing: 1971-01-11
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Granted: 1973-01-16
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Expires: 1991-01-11
Abstract
Abstract High voltage cylindrical devices having coaxial cylindrical insulation layers of different strength constants, the strength constants and the dimensions of the insulation layers being selected to achieve approximately the minimum obtainable outside diameter of the device or to achieve a device having a smaller outside diameter than a one layer device of equivalent electrical characteristics.
Inventors
- 👤 P Denes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:51
CPC Classifications
H; H01; H01B; H01B9/00; H01B9/02; H01B11/00; H01B11/18; H01B11/20; H01B17/00; H01B17/26; H01B17/28; H01B3/00; H01B3/002; H01B3/006; H01B3/02; H01B3/16; H01B7/00; H01B7/02; H01B7/0208; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/206; H01G4/38; H01G4/385
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
185 words
A cylindrical electrical device, comprising: a cylindrical inner conductor having a radius RO, a plurality n of cylindrical layers of insulating material formed about said inner conductor and each having an outside radius R1, a maximum allowable dielectric stress Ei and a strength constant Mi equal to the product of the dielectric constant thereof and the maximum allowable dielectric stress Ei thereof, i being the identification number of the layer and being unity for the innermost layer and n for the outermost layer, said device being operable with a peak voltage difference V between said inner conductor and The outer surface of the outermost layer of insulating material, the product of the strength constant M1 and the inside radius of the first layer being approximately the same as the product of the strength constant and inside radius of each of the other layers, and the respective radii of said layers being approximately equal to the radii required to satisfy the following equations: application of said peak voltage V to said device being effective to simultaneously create said maximum allowable stresses Ei in the respective layers.
Claim 2
Dependent Claim
185 words
A cylindrical electrical device, comprising: a cylindrical inner conductor having a radius RO, a plurality n of cylindrical layers of insulating material formed about said inner conductor and each having an outside radius R1, a maximum allowable dielectric stress Ei and a strength constant Mi equal to the product of the dielectric constant thereof and the maximum allowable dielectric stress Ei thereof, i being the identification number of the layer and being unity for the innermost layer and n for the outermost layer, said device being operable with a peak voltage difference V between said inner conductor and The outer surface of the outermost layer of insulating material, the product of the strength constant M1 and the inside radius of the first layer being approximately the same as the product of the strength constant and inside radius of each of the other layers, and the respective radii of said layers being approximately equal to the radii required to satisfy the following equations: application of said peak voltage V to said device being effective to simultaneously create said maximum allowable stresses Ei in the respective layers.
Claim 3
Dependent Claim
11 words
The device of claim 1 wherein said device is a capacitor.
Claim 4
Dependent Claim
11 words
The device of claim 1 wherein said device is an insulator.
Claim 5
Dependent Claim
11 words
The device of claim 1 wherein said device is a cable.
Claim 6
Dependent Claim
13 words
The device of claim 4 wherein the outermost insulating layer is a gas.
Claim 7
Dependent Claim
30 words
The device of claim 4 wherein the material of one insulating layer is selected from the group consisting of aluminum oxide powder filled polypropylene and aluminum oxide powder filled polyethylene.
Claim 8
Dependent Claim
36 words
The device in accordance with claim 1 wherein the first insulating layer is of cross-linked polypropylene mixed with alumina powder and the second insulating layer is of sulfur hexafluoride gas under pressure greater than 1 atm.
Claim 9
Dependent Claim
36 words
The device in accordance with claim 1 wherein the first insulating layer is of cross-linked polyethylene mixed with alumina powder and the second insulating layer is of sulfur hexafluoride gas under pressure greater than 1 atm.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |