Patent US3345459A successfully refreshed from Google Patents.
US3345459A
Expired / Lapsed
US
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Information display systems utilizing a metachromic display screen
Assignee: Ferranti International PLC
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Filing: 1965-05-27
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Granted: 1967-10-03
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Expires: 1985-05-27
Abstract
No abstract record available.
Inventors
- 👤 Dudley Michael Duke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:02
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/74; H04N5/7416; H04N5/7425; G; G01; G01S; G01S1/00; G01S1/02; G09; G09G; G09G3/00; G09G3/02; H04N5/222; H04N5/257
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
AN INFORMATION DISPLAY SYSTEM, COMPRISING A SCREEN OF SHORT-PERSISTENCE METACHROMIC MATERIAL, MEANS FOR PROJECTING AN IMAGE ONTO SAID SCREEN IN THE FORM OF A SYMBOLIC DISPLAY, A FLYING-SPOT SCANNER FOR REPEATEDLY SCANNING THE IMAGE ON THE SCREEN, SAID FLYING-SPOT SCANNER COMPRISING A CATHODE-RAY TUBE ARRANGED TO EMIT LIGHT OF WAVE LENGTHS WHICH CAUSE SAID SCREEN TO BECOME OPAQUE AND A LIGHT-RESPONSIVE DEVICE LOCATED ON OPPOSITE SIDES OF THE SCREEN AND CAPABLE OF REPEATEDLY SCANNING THE IMAGE ON THE SCREEN, AND A CONTROL CIRCUIT HAVING AN INPUT ELECTRICALLY CONNECTED TO THE LIGHT-RESPONSIVE DEVICE AND AN OUTPUT ELECTRICALLY CONNECTED TO THE CATHODE RAY TUBE OF THE FLYING-SPOT SCANNER, SAID CONTROL CIRCUIT BEING OPERABLE TO MODULATE LIGHT EMITTED BY THE CATHODE-RAY TUBE SO THAT THE INTENSITY OF THE LIGHT VARIES IN DIRECT PROPORTION TO OPACITY OF THE METACHROMIC SCREEN.
Claim 2
Dependent Claim
136 words
AN INFORMATION DISPLAY SYSTEM, COMPRISING A SCREEN OF SHORT-PERSISTENCE METACHROMIC MATERIAL, MEANS FOR PROJECTING AN IMAGE ONTO SAID SCREEN IN THE FORM OF A SYMBOLIC DISPLAY, A FLYING-SPOT SCANNER FOR REPEATEDLY SCANNING THE IMAGE ON THE SCREEN, SAID FLYING-SPOT SCANNER COMPRISING A CATHODE-RAY TUBE ARRANGED TO EMIT LIGHT OF WAVE LENGTHS WHICH CAUSE SAID SCREEN TO BECOME OPAQUE AND A LIGHT-RESPONSIVE DEVICE LOCATED ON OPPOSITE SIDES OF THE SCREEN AND CAPABLE OF REPEATEDLY SCANNING THE IMAGE ON THE SCREEN, AND A CONTROL CIRCUIT HAVING AN INPUT ELECTRICALLY CONNECTED TO THE LIGHT-RESPONSIVE DEVICE AND AN OUTPUT ELECTRICALLY CONNECTED TO THE CATHODE RAY TUBE OF THE FLYING-SPOT SCANNER, SAID CONTROL CIRCUIT BEING OPERABLE TO MODULATE LIGHT EMITTED BY THE CATHODE-RAY TUBE SO THAT THE INTENSITY OF THE LIGHT VARIES IN DIRECT PROPORTION TO OPACITY OF THE METACHROMIC SCREEN.
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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) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |