4. Radiant energy
  5. Photocells; circuits and apparatus
  6. Optical or pre-photocell system

Alfred Wuthrich

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Infrared intrusion detector

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

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Infrared intrusion detector

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

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Method of and apparatus for signalling an alarm

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Sabotage resistant light barrier wherein radiation is polarized

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

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Profile ID: LFUS-PAI-P-666151

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