Texas-based shell company Lodsys has often been accused of being a patent troll for its various attempts to take legal action against app developers and companies that it claims uses its technologies. Most notably, the company last year attempted to get iOS and Android developers to pay royalties over in-app purchasing before Apple’s legal team eventually intervened on behalf of developers. Now, after recent threats from Lodsys to Oracle customers such as Walgreens over a web-chat technology, Oracle is suing Lodsys in an attempt to invalidate its patents. GigaOM reported:

Oracle has decided to weigh in because Lodsys “has repeatedly threatened numerous Oracle customers” such as Walgreens over the use of a web-chat feature Lodsys claims to own. Oracle is asking the court to declare that the four patents Lodsys is using to bully its customers are not new inventions. The patents, including US Patent  5,999,908 (“customer based design module”), came to prominence last year when Lodsys used them to sue Best Buy, Adidas and others.