In reference to the patent US6754472:

Does the claim of sending electrical signals from the transmitter also encompass electromagnetic signals?

2 Answers 2


IANAL: In my opinion as an electrical engineer I'd say no. Electromagnetic implies the transmission of energy through a non-conductive or low-conductive medium over some distance.

There is a also the case where energy can be induced from a power source to a power receiver through inductance and/or capacitance over a close distance.

The way I read "electrical" in the patent claims and the drawings is energy that is "conducted" to the load via electrical wiring.

It seems the patent focuses on attached wiring so to me that implies only conductive passing of "electrical" energy.


This particular patent looks to be expired. So the answer would be no.

  • What a patent claim encompasses is independent of whether the patent is still in force. Your pointing out the status of the patent is relevant and useful, but your answer isn't necessarily correct. Also one sentence answers are discouraged. Perhaps if you could edit the answer to address only the patent's expiration state and describe how you determined it, the answer would be better.
    – Eric S
    Jul 30 at 0:00
  • Doesn't exactly answer this 6 year old question. Late answers are encouraged if they add to previous answers.
    – George White
    Aug 3 at 16:51

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