tying
n.β Β«The court will determine whether Illinois Tool Works (Research) violated antitrust laws under the Sherman Act by forcing consumers of its patented ink jet printer to buy a certain type of printer ink for use with its printerβa practice known as tying.Β» ββCheaper refills vs. patent profits” by Shaheen Pasha CNN Money Nov. 28, 2005. (source: Double-Tongued Dictionary)