Patent US3437401A successfully refreshed from Google Patents.
US3437401A
Expired / Lapsed
US
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Light-intercepting sheet for an illuminated display device
Assignee: Visorama Printed Motions Co
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Filing: 1964-05-25
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Granted: 1969-04-08
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Expires: 1984-05-25
Abstract
No abstract record available.
Inventors
- 👤 Anthony Siksai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:55
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/02; G02B27/08; B; B44; B44F; B44F1/00; B44F1/08; B44F1/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |