Intellectual Property Law
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There were plastic Elizabethan collars in 1978 (at least) (see Patent 4,200,057) and as such, the 20 year period has long expired.
That means that you should not run into any patent issues if you have a standard cone collar connected with Velcro. I found a patent with Velcro connecting it filed in 1991, and even that's past 20 years.
So in short, any patent protection for that type of collar has run.
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