Fast shutter for protection from electromagnetic radiation
Patent 5022742 Issued on June 11, 1991. Estimated Expiration Date: 
June 11, 2008. 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.
June 11, 2008. 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 1632069 3245315 3266370 3271578 3305863 3475609 3656836 3695747 3902061 Diffraction smoothing aperture for an optical beam Patent #: 3980397 InventorApplicationNo. 538617 filed on 10/03/1983US Classes:359/245, Electro-optic359/322Electro-optic crystal materialExaminersPrimary: LaRoche, Eugene R.Attorney, Agent or FirmForeign Patent References
International ClassG02F 001/01AbstractA solid state shutter for blocking EMP is disclosed. The shutter includes thin films of amorphous semiconductor material fro the Group V or VI elements deposited on a silicon dioxide substrate. An antenna senses incident EMP causing a trigger circuit to apply a voltage across the thin films. The thin films switch from a state of high resistance to a state of low resistance for blocking passage of the EMP.Other References
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