Patent US2443028A successfully refreshed from Google Patents.
Patent US2755404A successfully refreshed from Google Patents.
US2755404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dark trace cathode-ray tube and method of manufacture
Assignee: White Consolidated Industries Inc
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Filing: 1954-03-25
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Granted: 1956-07-17
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Expires: 1974-03-25
Abstract
No abstract record available.
Inventors
- 👤 Levy Gustave
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:26
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A CATHODE-RAY TUBE COMPRISING IN COMBINATION, AN ENCLOSING EVACUATED ENVELOPE, MEANS TO DEVELOP A BEAM OF ELECTRONS, A SCREEN UPON WHICH SAID BEAM IMPINGES TO MAKE A RECORD, SAID SCREEN COMPRISING A LAYER OF SCOTOPHOR MATERIAL WHICH DEVELOPS OPACITY CENTERS WHEN SAID BEAM IMPINGES THEREON, AND MEANS TO ERASE SAID CENTERS, THE LAST-MENTIONED MEANS INCLUDING A LAYER OF ALUMINUM ON SAID SCOTOPHOR MATERIAL FACING SAID BEAM-DEVELOPING MEANS, AND AN INFRA-RED RADIATION GENERATOR WITHIN SAID ENVELOPE BETWEEN SAID BEAM-DEVELOPING MEANS AND SAID SCREEN, SAID GENERATOR BEING ESPECIALLY DESIGNED TO PRODUCE SUBSTANTIAL RADIATION AT WAVELENGTHS LESS THAN 25X10-4 CM., SAID ALUMINUM LAYER HAVING A THINNESS WHICH IS TRANSPARENT TO SAID BEAM BUT WHICH DEVELOPS HEAT BY CONVERTING SAID INFRA-RED RADIATION INTO WAVELENGTHS WHICH ARE SUBSTANTIALLY ABSORBED BY SAID SCOTOPHOR MATERIAL.
Claim 2
Dependent Claim
128 words
A CATHODE-RAY TUBE COMPRISING IN COMBINATION, AN ENCLOSING EVACUATED ENVELOPE, MEANS TO DEVELOP A BEAM OF ELECTRONS, A SCREEN UPON WHICH SAID BEAM IMPINGES TO MAKE A RECORD, SAID SCREEN COMPRISING A LAYER OF SCOTOPHOR MATERIAL WHICH DEVELOPS OPACITY CENTERS WHEN SAID BEAM IMPINGES THEREON, AND MEANS TO ERASE SAID CENTERS, THE LAST-MENTIONED MEANS INCLUDING A LAYER OF ALUMINUM ON SAID SCOTOPHOR MATERIAL FACING SAID BEAM-DEVELOPING MEANS, AND AN INFRA-RED RADIATION GENERATOR WITHIN SAID ENVELOPE BETWEEN SAID BEAM-DEVELOPING MEANS AND SAID SCREEN, SAID GENERATOR BEING ESPECIALLY DESIGNED TO PRODUCE SUBSTANTIAL RADIATION AT WAVELENGTHS LESS THAN 25X10-4 CM., SAID ALUMINUM LAYER HAVING A THINNESS WHICH IS TRANSPARENT TO SAID BEAM BUT WHICH DEVELOPS HEAT BY CONVERTING SAID INFRA-RED RADIATION INTO WAVELENGTHS WHICH ARE SUBSTANTIALLY ABSORBED BY SAID SCOTOPHOR MATERIAL.
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) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |