US3718383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic optical element having refractive index gradient
Assignee: Eastman Kodak Co
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Filing: 1971-04-19
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Granted: 1973-02-27
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Expires: 1991-04-19
Abstract
Abstract IN REFRACTIVE INDEX EXTENDING IN A DIRECTION SUBSTANTIALLY PERPENDICULAR TO THE OPTICAL AXIS OF THE ELEMENT. THE ELEMENT HAS LENS-LIKE PROPERTIES. THE INVENTION RELATES TO A TRANSPARENT ELEMENT FOR THE DEFLECTION OF INCIDENT ELECTROMAGNETIC RADIATION HAVING AN OPTICAL AXIS EXTENDING THERETHROUGH. THE ELEMENT INCLUDES A SHAPED POLYMERIC MATRIX HAVING AN ORGANIC DILUENT THEREWITHIN, THE DILUENT FORMING A CONTINUOUS GRADIENT
Inventors
- 👤 R Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:10
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/0087; B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00355; B29D11/00663; B29D11/00682; C; C08; C08J; C08J7/00; C08J7/02; G02B1/00; G02B1/04
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |