4. Optics: measuring and testing
  5. Refraction testing

Arnold Walkow

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Fiber optics head utilizing randomized fibers per sensor

Optical waveguides – Optical waveguide sensor
Reexamination Certificate

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Method and apparatus for a derivative spectrometer

Optics: measuring and testing – By shade or color – With color transmitting filter
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Method and apparatus for a downhole fluorescence spectrometer

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
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Method and apparatus for a downhole fluorescence spectrometer

Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
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Method and apparatus for a downhole refractometer and...

Optics: measuring and testing – Refraction testing
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Profile ID: LFUS-PAI-P-2691358

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