US3254267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor-controlled, direct current responsive electroluminescent phosphors
Assignee: Westinghouse Electric Corp
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Filing: 1960-10-25
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Granted: 1966-05-31
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Expires: 1980-10-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Edgar A Sack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:10
CPC Classifications
G; G08; G08B; G08B5/00; G08B5/22; G08B5/36; H; H05; H05B; H05B33/00; H05B33/12; H05B33/26; H05B44/00; Y; Y02; Y02B; Y02B20/00; Y02B20/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A DISPLAY DEVICE COMPRISING A BODY OF PHOSPHOR MATERIAL HAVING THE PROPERTY OF EXHIBITING ELECTROLUMINESCENCE WHEN SUBJECTED TO A NON-VARYING ELECTRICAL FIELD, A SEMICONDUCTOR ELEMENT ELECTRICALLY COUPLED TO SAID BODY OF PHOSPHOR MATERIAL RESPONSIVE TO AN APPLIED ENERGY SIGNAL TO SWITCH FROM A FIRST STABLE STATE OF LOW CONDUCTIVITY TO A SECOND STABLE STATE OF HYPERCONDUCTIVITY WITH A TRANSITION REGION OF NEGATIVE RESISTANCE BETWEEN SAID FIRST AND SECOND STABLE STATES, AND MEANS TO APPLY AN ENERGY SIGNAL PULSE TO SAID SEMICONDUCTOR ELEMENT TO CAUSE SAID ELEMENT TO SWITCH TO SAID SECOND STABLE STATE AND TO REMAIN IN THAT STATE FOLLOWING THE TERMINATION OF SAID PULSE.
Claim 2
Dependent Claim
105 words
A DISPLAY DEVICE COMPRISING A BODY OF PHOSPHOR MATERIAL HAVING THE PROPERTY OF EXHIBITING ELECTROLUMINESCENCE WHEN SUBJECTED TO A NON-VARYING ELECTRICAL FIELD, A SEMICONDUCTOR ELEMENT ELECTRICALLY COUPLED TO SAID BODY OF PHOSPHOR MATERIAL RESPONSIVE TO AN APPLIED ENERGY SIGNAL TO SWITCH FROM A FIRST STABLE STATE OF LOW CONDUCTIVITY TO A SECOND STABLE STATE OF HYPERCONDUCTIVITY WITH A TRANSITION REGION OF NEGATIVE RESISTANCE BETWEEN SAID FIRST AND SECOND STABLE STATES, AND MEANS TO APPLY AN ENERGY SIGNAL PULSE TO SAID SEMICONDUCTOR ELEMENT TO CAUSE SAID ELEMENT TO SWITCH TO SAID SECOND STABLE STATE AND TO REMAIN IN THAT STATE FOLLOWING THE TERMINATION OF SAID PULSE.
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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) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |