Patent US3746870A successfully refreshed from Google Patents.
US3746870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated light conduit
Assignee: CGEE ALSTHOM NORTH AMERICA Inc
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Filing: 1970-12-21
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Granted: 1973-07-17
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Expires: 1990-12-21
Abstract
Abstract A coating having uniform resistive properties is applied to the surface of a light-transmitting fiber or conduit which is supported by the wall of an insulating enclosure between regions of substantially different potentials. The same coating also covers the exterior surface of the supporting wall. Electrical discharge along the conduit surface, resulting from the breaking down of surface resistivity between localized areas of differing potential, is prevented by the presence of the coating which provides a resistive surface while allowing charge mobility sufficient to neutralize adjacent areas of differing potential.
Inventors
- 👤 D Demarest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:00
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4295; G02B6/44; G02B6/4401; G02B6/4415; G02B6/4416; G02B6/4417; H; H01; H01H; H01H33/00; H01H33/02; H01H33/42; H01H33/423
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
Apparatus for transmitting light energy between devices of different electrical potentials comprising: an insulating enclosure having an exterior surface, a plurality of spaced-apart conductors disposed on said surface and having different electrical potentials with respect to one another, a light conduit supported by said enclosure and extending between devices of different electrical potentials, said conduit being in contact with saiD exterior surface along an appreciable portion of its length, and a coating having substantially homogeneous resistive characteristics covering said conduit and all parts of said surface between said conductors and said conduit, said coating being in contact with said conductors and extending to said devices to form a continuous surface of substantially homogeneous resistive characteristics therebetween, whereby a substantially uniform voltage gradient along said conduit is obtained.
Claim 2
Dependent Claim
127 words
Apparatus for transmitting light energy between devices of different electrical potentials comprising: an insulating enclosure having an exterior surface, a plurality of spaced-apart conductors disposed on said surface and having different electrical potentials with respect to one another, a light conduit supported by said enclosure and extending between devices of different electrical potentials, said conduit being in contact with saiD exterior surface along an appreciable portion of its length, and a coating having substantially homogeneous resistive characteristics covering said conduit and all parts of said surface between said conductors and said conduit, said coating being in contact with said conductors and extending to said devices to form a continuous surface of substantially homogeneous resistive characteristics therebetween, whereby a substantially uniform voltage gradient along said conduit is obtained.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |