Backseat: As far as I can tell, there is no US Patent owned by Intamin, Giovanola, or B&M for the 'box track' design.  Though there might be a european (Swiss) one, I would 
not be suprised if they shared it.  I did a little checking here at the job (I work at the US Patent Office) and there is at least one patent that Intamin and Giovanola share the rights too.  It's patent # 4,700,632, for a stand-up coaster restraint.  If you want to see it goto 
http://www.uspto.gov/patft/index.html   ,click on "Patent Number Search", enter the number, and hit search.  When the title comes up, click on the title, then select "images" and you will see a scanned copy of the document.  I have some other intersting pat nos but will contribute them via the news section.
 *** This post was edited by 2Hostyl on 11/22/2000. ***