Microscope with a condenser lens system having a tapered portion
Patent 5699197 Issued on December 16, 1997. Estimated Expiration Date: 
July 12, 2015. 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.
July 12, 2015. 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 2305760 2533371 2764061 3202049 3297393 3481665 3659924 Near field and solid immersion optical microscope Patent #: 5004307 InventorAssigneeApplicationNo. 501452 filed on 07/12/1995US Classes:359/661, Having less than four components359/368, Microscope359/389, With illumination and viewing paths coaxial at the image field359/656Microscope objectiveExaminersPrimary: Nelms, David C.Assistant: Bey, Dawn-Marie International ClassG02B 021/02Foreign Application Priority Data1993-01-08 JPAbstractA condenser lens system collects light from a light source to illuminate a sample, which comprises in the named order from the light source side a front group of positive refracting power having at least one lens and a rear group of positive refracting power at least having a positive lens for liquid immersion located closest to the sample and having a flat surface on the sample side.Other References
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