This is the patent:


It appeared in an episode of Shark Tank.

This is the actual product sold on amazon:


This is one knockoff that I can find:


The only real difference between the Moki Doorstep and the knockoff is that the knockoff is foldable.

Why isn't the knockoff infringing upon the Moki Doorstep?

  • 1
    Do you know that it is not a licensee of the patent ?
    – George White
    Commented Sep 21, 2022 at 4:12
  • I do not know that. However, why license out your invention when you are already manufacturing and selling it yourself? Commented Sep 21, 2022 at 4:19
  • 1
    @BigCatPublicSafetyAct If the foldable would cost more, or substantially the same, I'd say: Maybe because it's cheaper to sign a piece of paper and get free money than deal with manufacturing, sale administration, shipping, implied warranties, returns, refunds etc. But the more compact solution is 3 times less. I'd find it extremely unlikely the patent holder would have licensed for say, $2 a unit for the mockup company to manufacture for a dollar or two, then turn maybe a dollar profit while cannibalizing the original product that could probably turn +$10-15 profit each sale. Commented Sep 21, 2022 at 6:47
  • Amazon is the new flee market... Commented Sep 21, 2022 at 6:47

1 Answer 1


It is an infringement. However, unless a patent infringement notification is served on Amazon and the mockup company (or less plausibly the buyers), the infringement would not provide for a basis of a suit unless the fact is established by the of-jurisdiction court that the infringer knew about the invention, and willfully infringed. (see also the question: "Can you safely do anything without infringing patents?")

Although the mockup company may obtain a patent on the improvement if filed for, and found non-obvious, but that would not protect them from the infringement of the cited U.S. patent (#10,155,479 B2). It would merely mean that if the manufacturer of the original also wanted to start a foldable one, now they would need to deal with getting a license from the mockup company if they would have obtained a patent on the foldable invention.

  • 1
    This is a good answer, but perhaps you could try to avoid using legalese.
    – Eric S
    Commented Sep 21, 2022 at 21:08
  • @EricS Thank you for the feedback; I'll include a less legalese summary from now on. Commented Sep 22, 2022 at 2:17
  • Even though the answer is accepted, there is nothing keeping you from editing it if you want to add some polish. Thanks for the contribution.
    – Eric S
    Commented Sep 22, 2022 at 18:46

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .