Patent US3928177A successfully refreshed from Google Patents.
US3941918A
Expired / Lapsed
US
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Electrical insulator including an insulation shell having hardware members secured thereto by cement containing graphite fibers
Assignee: Canadian Porcelain Co
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Filing: 1973-01-22
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Granted: 1976-03-02
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Expires: 1993-01-22
Abstract
Abstract A cement for mechanically and electrically joining metal hardware to an insulator shell having a semiconducting surface is made conductive by having graphite fibres and carbon black particles admixed therein.
Inventors
- 👤 Olaf Nigol
- 👤 Gordon Rosenblatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:15
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; H01B1/14; H01B1/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
121 words
An electrical insulator comprising, in combination: an insulator shell having a semiconducting glaze surface, first and second conductive hardware members disposed on opposite sides of said insulator shell, first and second cement layers securing said first and second hardware members to said insulator shell; said first and second cement layers being in electrical contact with said semiconducting glaze surface; said first and second cement layers having graphite fibres admixed therein and being electrically conductive and defining a current flow path from said first hardware member, through said semiconducting glaze surface, and to said second conductive hardware member; and a conductive tar coating disposed between said first and second cement layers and the surfaces of said insulator shell to which they adhere.
Claim 2
Dependent Claim
121 words
An electrical insulator comprising, in combination: an insulator shell having a semiconducting glaze surface, first and second conductive hardware members disposed on opposite sides of said insulator shell, first and second cement layers securing said first and second hardware members to said insulator shell; said first and second cement layers being in electrical contact with said semiconducting glaze surface; said first and second cement layers having graphite fibres admixed therein and being electrically conductive and defining a current flow path from said first hardware member, through said semiconducting glaze surface, and to said second conductive hardware member; and a conductive tar coating disposed between said first and second cement layers and the surfaces of said insulator shell to which they adhere.
Claim 3
Dependent Claim
20 words
The electrical insulator of claim 1 wherein said graphite fibres form less than about 2.0% by weight of said cement.
Claim 4
Dependent Claim
12 words
The electrical insulator of claim 1 wherein said cement includes carbon black.
Claim 5
Dependent Claim
16 words
The electrical insulator of claim 3 wherein said carbon black is a high structure carbon black.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |