4. Automatic temperature and humidity regulation
  5. Motors
  6. Electric

Donald E. Charles

Inventor

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Battery charging and testing circuit

Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent

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Dosimeter for photometric applications

Radiant energy – Invisible radiant energy responsive electric signalling – Ultraviolet light responsive means
Patent

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Fail-safe electric actuator using high voltage capacitors

Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Reexamination Certificate

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Process and device for detecting frequency variations

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

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Room temperature sensor and thermostat control device

Automatic temperature and humidity regulation – With timing element – Timer other than clock
Patent

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Profile ID: LFUS-PAI-P-157190

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