US3570157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display device for displaying illuminated symbols
Assignee: Saab Bofors AB
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Filing: 1968-10-07
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Granted: 1971-03-16
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Expires: 1988-10-07
Abstract
Abstract A DISPLAY DEVICE FOR DISPLAYING ILLUMINATED SYMBOLS HAS IN A SOLID OPAQUE BLOCK A PLURALITY OF BORES EXTENDING FROM ONE SIDE AND TERMINATING SHORT OF THE OPPOSITE SIDE. A PLURALITY OF GROOVES FORMED IN THIS OPPOSITE SIDE INTERSECT THE BORES OPENING INTO THE SAME AND ACROSS EACH OTHER AT POINTS OTHER THAN POINTS IN REGISTRY WITH THE BORES. AN OPAQUE PIN IS FITTED IN EACH CROSSING POINT. LIGHT BULBS FITTED IN THE BORES ILLUMINATE THE GROOVED SECTIONS INTERSECTING THE BORES AND LIMITED BY THE PINS. THE THUS ILLUMINATED GROOVE SECTIONS REPRESENT THE SYMBOLS TO BE DISPLAYED.
Inventors
- 👤 Axel Erik Ludvig Ohlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:32
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/307
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |