Canon Patent Applications: Internal Camera ND filter
So no-one else can patent something close enough to what you have come up with, such that you would have to pay them if you choose to use it in an actual product in the future. Or to 'block' off the use (and patenting) of relatively small variations (which are relevant to patent attorneys) thereby preventing direct steals of your innovation by the opposition.I can't fathom how "so no one else will come up with it" comes into the picture.
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