Method for inspecting transparent rods
Patent 4168907 Issued on September 25, 1979. Estimated Expiration Date: 
December 30, 1997. 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.
December 30, 1997. 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 3777171 3879128 Optical thickness detecting and comparing method and apparatus Detecting optical fiber defects Method and apparatus for determining ratio of core radius to cladding radius in clad optical fibers Method for monitoring the properties of plastic coatings on optical fibers Patent #: 4042723 InventorAssigneeApplicationNo. 05/865977 filed on 12/30/1977US Classes:356/73.1, FOR OPTICAL FIBER OR WAVEGUIDE INSPECTION356/239.2Optical element (e.g., contact lens, prism, filter, lens, etc.)ExaminersPrimary: McGraw, Vincent P.Attorney, Agent or FirmInternational ClassesG01N 21/88 (20060101)G01M 11/00 (20060101) AbstractA sensitive, nondestructive method of viewing the internal structure of multilayered optical fiber preforms is described. The method comprises the steps of transversely illuminating the preform, and intercepting the light that traverses the preform on a viewing screen. To obtain a complete picture, the preform is rotated 360 degrees about its axis. The technique provides a detailed view of the core size and eccentricity, and of the structure of the multilayered core.Field of SearchFOR OPTICAL FIBER OR WAVEGUIDE INSPECTION | |
