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For questions relating to the legal requirements necessary for applications to be granted a patent. Please include a tag relating to the relevant type of intellectual property protection you are asking about. There are invention patents, design patents and utility models. For an explanation of the differences, read the full tag description.

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If I modify an existing product in a way that broadens its use, can I patent the whole thing...

In the case of attachment, you can only patent your modifications along with its other uses. Not the entire product (i.e. pet training gadget). I don't have much background in patents but, for what …
siez khan's user avatar