Adjunct To An Existing Device

I have built an electrical device that screws on to the back end of a Maglite flashlight. Am I in any way in violation Maglite's patent on their flashlight? The threads are not standard. However, my device is not in anyway a competitor to the Maglight. I am in the state of CA.

TIA!

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Am I in any way in violation Maglite's patent on their flashlight?

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It's possible. There's no way for us to tell you for sure.

What you need to do is take your product to an attorney specializing in patent law and have him/her look it and MagLite's patent over.