Double-refracting planar plate arrangement and deep ultraviolet λ/4-plate
Patent 6084708 Issued on July 4, 2000. Estimated Expiration Date: 
September 15, 2017. 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.
September 15, 2017. 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 2313349 2823491 Variable thickness double-refracting plate Patent #: 3957375 InventorAssigneeApplicationNo. 929913 filed on 09/15/1997US Classes:359/494, By birefringent element359/352, Having polarizing element359/500With particular material or mounting structureExaminersPrimary: Henry, Jon W.Attorney, Agent or FirmForeign Patent References
International ClassG02B 005/30Foreign Application Priority Data1996-09-14 DEAbstractThe invention is directed to a double refracting planar plate arrangement and a λ/4 plate suitable for deep ultraviolet light. The λ/4 plate or the like is configured as a planar plate with stress-induced birefringence. The planar plate 1 is made of high quality quartz glass and is torsion-free and uniformly loaded in tension via suitable construction having several parallel tension devices (3, 7).Other References
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