Fox also purchased sound-on-film patents from Freeman Harrison Owens and Theodore Case and used these inventions to create the new sound-on-film system he dubbed Fox Movietone.

Righthaven's business model may have been inspired by patent-troll companies, who purchase patents for the sole purpose of suing and threatening to sue.

Defensive patent aggregation (DPA) is the practice of purchasing patents or patent rights to keep such patents out of the hands of entities that would assert them against operating companies.

To prevent such litigations, operating companies sometimes purchase patents in technologies which they use or develop.

Operating companies have also pooled their efforts and financial resources to purchase patents.

Gibbs purchased the ideas and patents of inventor Clement Payen to make the storage battery a commercial product.

Defensive patent aggregation, the practice of purchasing patents or patent rights from patent holders so they don't end up in the hands of an individual or enterprise that can assert them.

Their sons or grandsons purchased patents of nobility and their daughters married into the aristocracy.

An exception to this is purchased patents that may be amortized over the life of the patent.

In 1834, John Yount and William B. Scott, purchased patents on the lands in section sixteen on which the village of Hibernia and its river landing were situated.