US2754444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray tube comprising fluorescent screen
Assignee: Hartford National Bank and Trust Co
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Filing: 1952-04-30
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Granted: 1956-07-10
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Expires: 1972-04-30
Abstract
No abstract record available.
Inventors
- 👤 Zalm Pieter
- 👤 Klasens Hendrik Anne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:46
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/64; C09K11/646
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A FLYING SPOT SCANNER COMPRISING A CATHODE-RAY TUBE, SAID TUBE COMPRISING AN ELECTRON GUN AND A LUMINESCENT SCREEN RESPONSIVE TO ELECTRON BOMBARDMENT COMPRISING BLUE AND ULTRA-VIOLENT LUMINESCENT MATERIAL ACTIVATED BY ABOUT 0.05 TO 10 MOL. PER CENT OF TRIVALENT CERIUM, SAID MATERIAL HAVING A DECAY TIME OF FLUORESCENCE OF LESS THAN 10-6 SEC., SAID MATERIAL CONSISTING OF A CRYSTALLISED FIRED REACTION PRODUCT OF SILICON DIOXIDE, AND OXIDE OF AN ALKALINE EARTH METAL AND ALUMINUM OXIDE, SAID MATERIAL BEING IN THE PROPORTIONS AT WHICH THE FIRED REACTION PRODUCT LIES WITHIN A REGION OF THE TERNARY SYSTEM MO-SIO2-AL2O3 (M REPRESENTING THE ALKALINE EARTH METAL) DEFINED BY LINES AB, BC, CD, DE, EA, WHOSE END POINTS A, B, C, D AND E ARE DEFINED BY THE FOLLOWING COMPOSITIONS:
Claim 2
Dependent Claim
125 words
A FLYING SPOT SCANNER COMPRISING A CATHODE-RAY TUBE, SAID TUBE COMPRISING AN ELECTRON GUN AND A LUMINESCENT SCREEN RESPONSIVE TO ELECTRON BOMBARDMENT COMPRISING BLUE AND ULTRA-VIOLENT LUMINESCENT MATERIAL ACTIVATED BY ABOUT 0.05 TO 10 MOL. PER CENT OF TRIVALENT CERIUM, SAID MATERIAL HAVING A DECAY TIME OF FLUORESCENCE OF LESS THAN 10-6 SEC., SAID MATERIAL CONSISTING OF A CRYSTALLISED FIRED REACTION PRODUCT OF SILICON DIOXIDE, AND OXIDE OF AN ALKALINE EARTH METAL AND ALUMINUM OXIDE, SAID MATERIAL BEING IN THE PROPORTIONS AT WHICH THE FIRED REACTION PRODUCT LIES WITHIN A REGION OF THE TERNARY SYSTEM MO-SIO2-AL2O3 (M REPRESENTING THE ALKALINE EARTH METAL) DEFINED BY LINES AB, BC, CD, DE, EA, WHOSE END POINTS A, B, C, D AND E ARE DEFINED BY THE FOLLOWING COMPOSITIONS:
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) | 1959-07-10 | 1960-01-09 | 1960-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-10 | 1964-01-09 | 1964-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-10 | 1968-01-09 | 1968-07-10 | $7700.00 | Window Closed / Lapsed |