Light filtering arrangement for holographic displays
Patent 3944322 Issued on March 16, 1976. Estimated Expiration Date: 
March 16, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 16, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3653138 3811751 3838903 InventorAssigneeApplicationNo. 541608 filed on 01/16/1975US Classes:359/32, For reconstructing image359/31Focused image holographyExaminersPrimary: Stern, Ronald J.Attorney, Agent or FirmAbstractA holographic arrangement is provided with light filtering means for transmitting only those light rays to the hologram which are incident to the hologram at the prescribed angles required for substantial diffraction while at the same time operating to preclude the transmission of other light rays to the hologram which would otherwise be incident to the hologram at angles outside the prescribed range of angles required for substantial diffraction by the hologram. In this manner background light which would otherwise be transmitted through a hologram so as to degrade the quality of a stereoscopic image reconstructed from the hologram is precluded from ever reaching the viewing area.Other References
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