Halide fibre with high numerical aperture
Patent 4836643 Issued on June 6, 1989. Estimated Expiration Date: 
February 2, 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.
February 2, 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 ReferencesMulticonstituent optical fiber Patent #: 4666247 InventorsAssigneeApplicationNo. 07/151677 filed on 02/02/1988US Classes:385/142, Of waveguide core385/123, OPTICAL FIBER WAVEGUIDE WITH CLADDING385/144Of waveguide claddingExaminersPrimary: Lee, John D.Assistant: Ngo, John Attorney, Agent or FirmInternational ClassesC03C 13/00 (20060101)C03C 13/04 (20060101) C03C 3/32 (20060101) Foreign Application Priority Data1987-02-16 GBAbstractA high numerical aperture optical fibre, e.g. for use in remote spectroscopy, has a cladding of a halide glass which contains Hf and a core of a halide glass which contains Pb. Preferably both glasses contain ZrF4, BaF2, LaF3, AlF3 and NaF. In addition the cladding contains HfF4 but no PbF2 and the core contains PbF2 but no HfF4.Other References
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