US3149281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent voltage measuring device
Assignee: International Standard Electric Corp
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Filing: 1961-03-01
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Granted: 1964-09-15
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Expires: 1981-03-01
Abstract
No abstract record available.
Inventors
- 👤 Lieb Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:03
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/40; G01R13/401; G01R13/402; H; H04; H04N; H04N3/00; H04N3/10; H04N3/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A DEVICE FOR INDICATING THE MAGNITUDE OF AN ELECTRIC VOLTAGE BY THE VARIATION IN EXTENT OF A LUMINOUS PATTERN, COMPRISING TWO ELECTRICALLY CONDUCTING COATINGS, OF WHICH AT LEAST ONE IS OPTICALLY TRANSPARENT, ONE OF SAID CONDUCTING COATINGS HAVING AN ELECTRICAL RESISTANCE RELATIVELY HIGHER THAN THE OTHER, A CONTINUOUS VOLTAGE-DEPENDENT RESISTANCE LAYER THE RESISTANCE OF WHICH CHANGES ABRUPTLY AT A PREDETERMINED VOLTAGE LEVEL TO GIVE A SHARP BOUNDARY BETWEEN THE LUMINOUS AND NON-LUMINOUS PATTERN, A LAYER OF ELECTROLUMINESCENT SUBSTANCE CONTINUOUSLY ADJOINING SAID VOLTAGE-DEPENDENT RESISTANCE LAYER, SAID ELECTROLUMINESCENT SUBSTANCE AND SAID RESISTANCE LAYER POSITIONED BETWEEN SAID COATINGS AND HAVING UNIFORM THICKNESSES THEREALONG, AND MEANS FOR APPLYING A VOLTAGE BETWEEN ONE END OF SAID RESISTANCE COATING AND THE OTHER COATING, WHEREBY UPON APPLICATION OF A PREDETERMINED VOLTAGE A LIGHT EMISSION WILL AT FIRST ONLY APPEAR SUBSTANTIALLY AT THE POINT OF APPLICATION, BUT WILL CONTINUOUSLY EXTEND TO FURTHER SURFACE AREAS OF THE LUMINOUS PATTERM AS THE VOLTAGE IS INCREASED.
Claim 2
Independent Claim
155 words
A DEVICE FOR INDICATING THE MAGNITUDE OF AN ELECTRIC VOLTAGE BY THE VARIATION IN EXTENT OF A LUMINOUS PATTERN, COMPRISING TWO ELECTRICALLY CONDUCTING COATINGS, OF WHICH AT LEAST ONE IS OPTICALLY TRANSPARENT, ONE OF SAID CONDUCTING COATINGS HAVING AN ELECTRICAL RESISTANCE RELATIVELY HIGHER THAN THE OTHER, A CONTINUOUS VOLTAGE-DEPENDENT RESISTANCE LAYER THE RESISTANCE OF WHICH CHANGES ABRUPTLY AT A PREDETERMINED VOLTAGE LEVEL TO GIVE A SHARP BOUNDARY BETWEEN THE LUMINOUS AND NON-LUMINOUS PATTERN, A LAYER OF ELECTROLUMINESCENT SUBSTANCE CONTINUOUSLY ADJOINING SAID VOLTAGE-DEPENDENT RESISTANCE LAYER, SAID ELECTROLUMINESCENT SUBSTANCE AND SAID RESISTANCE LAYER POSITIONED BETWEEN SAID COATINGS AND HAVING UNIFORM THICKNESSES THEREALONG, AND MEANS FOR APPLYING A VOLTAGE BETWEEN ONE END OF SAID RESISTANCE COATING AND THE OTHER COATING, WHEREBY UPON APPLICATION OF A PREDETERMINED VOLTAGE A LIGHT EMISSION WILL AT FIRST ONLY APPEAR SUBSTANTIALLY AT THE POINT OF APPLICATION, BUT WILL CONTINUOUSLY EXTEND TO FURTHER SURFACE AREAS OF THE LUMINOUS PATTERM AS THE VOLTAGE IS INCREASED.
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) | 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 |