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

Paul J. VanDrunen

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Electric motor control circuit having reduced...

Electricity: motive power systems – Motor-reversing
Reexamination Certificate

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Motorized barrier operator system adaptable to different...

Electricity: motive power systems – Motor-reversing – Automatic and/or with time-delay means
Reexamination Certificate

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Pivoting and barrier locking operator system

Electricity: motive power systems – Automatic and/or with time-delay means
Reexamination Certificate

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Pivoting and barrier locking operator system

Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Reexamination Certificate

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Pivoting and barrier locking operator system

Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2352629

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