US3562938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information display devices
Assignee: UNIVERSAL TELEWRITERS Pty Ltd
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Filing: 1968-09-16
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Granted: 1971-02-16
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Expires: 1988-09-16
Abstract
Abstract INFORMATION DISPLAY APPARATUS INCLUDES AN OPAQUE MEMBER WITH A MATRIX OF TRANSPARENT AREAS. AN INDIVIDUAL SHUTTER ASSOCIATED WITH EACH APERTURE IS MOVABLE BETWEEN TWO STABLE POSITIONS IN WHICH IT RESPECTIVELY EXPOSES AND OCCULTS THAT APERTURE. THE SHUTTER IS MOVED BY ELECTRICAL MEANS WHICH APPLIES DIRECTLY TO THE SHUTTER FORCES MOVING IT FROM ONE TO THE OTHER OF THE STABLE POSITIONS. THESE FORCES MAY BE ELECTROSTATIC OR ELECTROMAGNETIC.
Inventors
- 👤 Hassan Paddy Abdel Salam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:51
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/37; G09F9/375
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |