4. Electrical transmission or interconnection systems
  5. Plural supply circuits or sources
  6. Substitute or emergency source

Edward Laird

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Barrier movement control safety method and apparatus

Movable or removable closures – Safety means responsive to obstruction to closure – Closure drive stopping or reversal
Reexamination Certificate

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Barrier movement operator speed control

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

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Barrier movement system including a combined keypad and...

Communications: electrical – Selective – Intelligence comparison for controlling
Reexamination Certificate

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Controlled torque drive for a barrier operator

Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate

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Obstacle detector-responsive movable barrier operator...

Communications: electrical – Traffic control indicator – Portable
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2631541

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