4. Optics: measuring and testing
  5. Velocity or velocity/height measuring
  6. With light detector

William L. Chapman

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Apparatus for multi-channel induced polarization surveying

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent

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Arc-safe electrical receptacles

Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Reexamination Certificate

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Coarse and fine electronic bow correction for a writer

Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Reexamination Certificate

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Compound angle limiting device

Machine element or mechanism – Control lever and linkage systems – Elements
Patent

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Digital controlled low frequency power amplifier

Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent

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Profile ID: LFUS-PAI-P-88143

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