Can you take someone''s free product information from their website and reformat it and sell it on your own site?

The absence of a copyright notice does not mean that the work is no subject to copyright. As a general matter, there is always a copyright in any work of authorship, unless the work is so old that it has passed into the public domain, or it was created under circumstances where no copyright protection is possible. You should assume that someone owns the copyright in this work and that you will be sued if you reproduce it for a commercial purpose.