Patent US3560955A successfully refreshed from Google Patents.
US3560955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Birefringent display systems
Assignee: Teeg Research Inc
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Filing: 1968-12-30
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Granted: 1971-02-02
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Expires: 1988-12-30
Abstract
Abstract OPTICAL ELEMENTS FOR DISPLAY AND THE LIKE, UTILIZING A MATERIAL CAPABLE OF EXHIBITING OPTICAL BIREFRINGENCE WHEN PLACED UNDER STRESS OR STRAIN, PROVIDED WITH DIFFERENT ARRANGEMENTS FOR LOCALLY PLACING THE MATERIAL UNDER STRESS BY MEANS OF ELECTROSTRICTION, MAGNETOSTRICTION, HEAT DISTORTION, ETC., SUCH THAT THE STRESSED PORTIONS OF THE MATERIAL ACTS AS VARIABLE RETARDATION PLATE OR VARIABLE POLARIZER AND DISPLAY A DIFFERENT COLOR FROM THE COLOR DISPLAYED BY UNSTRESSED PORTIONS WHEN POLARIZED LIGHT IS PASSED THROUGH THE MATERIAL AND OBSERVED THROUGH AN ANALYZER.
Inventors
- 👤 Robert W Hallman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:38
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/11; G02F1/0009; G02F1/0128; G02F1/0131
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |