Patent US3235799A successfully refreshed from Google Patents.
US3235799A
Expired / Lapsed
US
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Electroluminescent frequency sensitive visual indicator
Assignee: Individual
•
Filing: 1954-12-27
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Granted: 1966-02-15
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Expires: 1974-12-27
Abstract
No abstract record available.
Inventors
- 👤 Hurvitz Hyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:06
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/20; H05B33/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
30 words
IN COMBINATION, A LAYER OF PIEZO-ELECTRIC MATERIAL, A LAYER OF DIELECTRIC MATERIAL SECURED TO SAID LAYER OF PIEZOELECTRIC MATERIAL, AND A QUANTITY OF ELECTROLUMINESCENT MATERIAL DISPERSED THROUGH SAID DIELECTRIC MATERIAL.
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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) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |