4. Measuring, testing, or signalling instruments
  5. Security or signal instrument or casing
  6. Alarm or control thereof

Joseph R. Perkins

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Infrared detector mirror

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Alarm or control thereof
Patent

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Optical system for use with color sorter or grader

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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Optical system to optimize field of view uniformity in a multi-c

Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent

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Wide angle ceiling mounted passive infrared intrusion detection

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent

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Profile ID: LFUS-PAI-P-596694

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