Your two main questions Murkz:
Does anyone here know who now owns TvT?
If no one owns TvT is it then abandonware?
The first question is the hard one, but the second one should be easier to figure out coz it's a straight legal question, any lawyers in the house?
According to the following link the title must be over 4 years old,
http://www.abandonwarering.com/?Page=FAQ
Wiki has a good article, here's a quote of relevance:
Enforcement of copyright
Old copyrights are usually left undefended. This can be due to intentional non-enforcement by owners due to software age or obsolescence, but sometimes results from a
corporate copyright holder going out of business without explicitly transferring ownership, leaving no one aware of the right to defend the copyright.
Even if the copyright is not defended, copying of such software is still unlawful in most jurisdictions when a copyright is still in effect. Abandonware changes hands on the assumption that the resources required to enforce copyrights outweigh benefits a copyright holder might realize from selling software licenses. Additionally, abandonware proponents argue that distributing software for which there is no one to defend the copyright is morally acceptable, even where unsupported by current law. Companies that have gone out of business without transferring their copyrights are an example of this; many hardware and software companies that developed older systems are long since out of business and precise documentation of the copyrights may not be readily available.
http://en.wikipedia.org/wiki/Abandonware