Patent USD293239S successfully refreshed from Google Patents.
US3445666A
Expired / Lapsed
US
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Electro-optical device with concentric arrangement of layers
Assignee: APT FINANCAL CORP A CORPOF NV
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Filing: 1964-10-26
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Granted: 1969-05-20
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Expires: 1984-10-26
Abstract
No abstract record available.
Inventors
- 👤 Alvin A Snaper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:36
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/047
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3274388A
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US2912592A
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US3235736A
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US3011157A
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US3046540A
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US3056031A
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US3083262A
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US3047867A
Cited
US3215846A
Cited
US3310681A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |