Patent EP0595237A1 successfully refreshed from Google Patents.
US3552048A
Expired / Lapsed
US
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Display device
Assignee: Pitney Bowes Inc
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Filing: 1968-07-01
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Granted: 1971-01-05
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Expires: 1988-07-01
Abstract
Abstract A FLUID OPERATED DISPLAY DEVICE WHEREIN A 7 X 5 MATRIX OF MOVABLE DISPLAY ELEMENTS ARE SELECTIVELY MOVED BY FLUID PRESSURE TO FORWARD DISPLAY POSITIONS AND REARWARD INVISIBLE POSITIONS. EACH FLUID OPERATED DISPLAY ELEMENT IS MAGNETICALLY RETAINED IN ITS RETRACTED POSITION AND IS SIMILARLY YIELDABLY RETAINED IN ITS FORWARD DISPLAY PORTION EITHER BY THE ACTION OF GRAVITY OR BY ANOTHER MAGNETIC MEANS.
Inventors
- 👤 Robert F O'keefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:21
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/37; G09F9/377
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |