Patent US2525183A successfully refreshed from Google Patents.
Patent US3200525A successfully refreshed from Google Patents.
US3200525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid read-out device
Assignee: Individual
•
Filing: 1963-05-13
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Granted: 1965-08-17
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Expires: 1983-05-13
Abstract
No abstract record available.
Inventors
- 👤 Samuel A Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:59
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/007; H; H02; H02K; H02K27/00; H02K27/30; F04; F04C; F04C18/00; F04C18/30; F04C18/32; F04C18/34; F04C18/356; F04C18/3562; F04C18/3564; F04C23/00; F04C23/001; F04C29/00; F04C29/0042; F04C29/0085; G; G09; G09F; G09F9/00; G09F9/46; H02K41/00; H02K41/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A FLUID OPERATED VISUAL DISPLAY FOR INDICIA COMPRISING A BODY OF TRANSPARENT MATERIAL HAVING A PREDETERMINED INDEX OF REFRACTION, MULTIPLE SUPERIMPOSED CHAMBER MEANS WITHIN SAID BODY HAVING PORTIONS DEFINING THE EDGES OF INDICIA TO BE DISPLACED WHEN SAID BODY IS SUBJECTED TO EDGE LIGHTING, MEANS FOR ILLUMINATING THE EDGES OF THE INDICIA, MEANS FOR SUPPLYING A TRANSPARENT LIQUID HAVING AN INDEX OF REFRACTION SUBSTANTIALLY EQUAL TO THE INDEX OF
Claim 2
Dependent Claim
69 words
A FLUID OPERATED VISUAL DISPLAY FOR INDICIA COMPRISING A BODY OF TRANSPARENT MATERIAL HAVING A PREDETERMINED INDEX OF REFRACTION, MULTIPLE SUPERIMPOSED CHAMBER MEANS WITHIN SAID BODY HAVING PORTIONS DEFINING THE EDGES OF INDICIA TO BE DISPLACED WHEN SAID BODY IS SUBJECTED TO EDGE LIGHTING, MEANS FOR ILLUMINATING THE EDGES OF THE INDICIA, MEANS FOR SUPPLYING A TRANSPARENT LIQUID HAVING AN INDEX OF REFRACTION SUBSTANTIALLY EQUAL TO THE INDEX OF
References Cited (Backward Citations)
US1485772A
Cited
US2489751A
Cited
US2621430A
Cited
US2612078A
Cited
US2722762A
Cited
US2703547A
Cited
US2751584A
Cited
US2783692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |