US3149262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current cold cathode vacuum lamp
Assignee: Tung Sol Electric Inc
•
Filing: 1959-02-04
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Granted: 1964-09-15
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Expires: 1979-02-04
Abstract
No abstract record available.
Inventors
- 👤 Albert M Skellett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:24
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J17/066; H01J2893/00; H01J2893/0064; H01J2893/0065; H01J2893/0066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A DIRECT CURRENT COLD CATHODE VACUUM LAMP COMPRISING AN EVACUATED ENVELOPE OF TRANSPARENT INSULATING MATERIAL, CATHODO-LUMINESCENT PHOSPHOR MATERIAL SUPPORTED ON THE INNER WALL OF SAID ENVELOPE, A CATHODE WITHIN THE ENVELOPE COMPRISING A METALLIC CONDUCTOR HAVING A POROUS SPONGE-LIKE COATING THEREON, SAID COATING BEING ADAPTED TO EMIT A COPIOUS SELF-SUSTAINING STREAM OF ELECTRONS ONCE ELECTRON EMISSION THEREFROM IS INITIATED, AND AN ELECTRODE WITHIN THE ENVELOPE ADAPTED TO BE MAINTAINED AT A POTENTIAL ABOVE THAT OF THE CATHODE AND POSITIONED TO DIRECT ELECTRONS EMITTED BY SAID COATING TO SAID PHOSPHOR MATERIAL TO CAUSE LUMINESCENCE THEREOF, THE LIGHT EMITTED BY SAID LAMP WHEN ENERGIZED BEING SUBSTANTIALLY ENTIRELY THAT GIVEN OFF BY THE PHOSPHOR MATERIAL.
Claim 2
Dependent Claim
112 words
A DIRECT CURRENT COLD CATHODE VACUUM LAMP COMPRISING AN EVACUATED ENVELOPE OF TRANSPARENT INSULATING MATERIAL, CATHODO-LUMINESCENT PHOSPHOR MATERIAL SUPPORTED ON THE INNER WALL OF SAID ENVELOPE, A CATHODE WITHIN THE ENVELOPE COMPRISING A METALLIC CONDUCTOR HAVING A POROUS SPONGE-LIKE COATING THEREON, SAID COATING BEING ADAPTED TO EMIT A COPIOUS SELF-SUSTAINING STREAM OF ELECTRONS ONCE ELECTRON EMISSION THEREFROM IS INITIATED, AND AN ELECTRODE WITHIN THE ENVELOPE ADAPTED TO BE MAINTAINED AT A POTENTIAL ABOVE THAT OF THE CATHODE AND POSITIONED TO DIRECT ELECTRONS EMITTED BY SAID COATING TO SAID PHOSPHOR MATERIAL TO CAUSE LUMINESCENCE THEREOF, THE LIGHT EMITTED BY SAID LAMP WHEN ENERGIZED BEING SUBSTANTIALLY ENTIRELY THAT GIVEN OFF BY THE PHOSPHOR MATERIAL.
References Cited (Backward Citations)
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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) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |