--- title: IP Business Intelligence Blog | Patent Blog | Intellectual Property Blog | IP Blog | Patent Assertion Entities description: Patent Assertion Entities | Business perspectives on patents, strategy, innovation, entrepreneurship and technology by IPVision leaders, corporate executives, and MIT faculty. --- [![logo](https://info.ipvisioninc.com/hs-fs/hubfs/ipvision-site/images/logo.png?width=200&name=logo.png "logo")](http://www.ipvisioninc.com/) - [Contact Us](http://www.ipvisioninc.com/about-us/contact-us/) - [Blog](https://info.ipvisioninc.com/IPVisions) ![IP vision blog banner](https://info.ipvisioninc.com/hs-fs/hubfs/ipvision-site/images/banner_blog-1.jpg?width=1400&name=banner_blog-1.jpg "IP vision blog banner") ## IPVision Blog Written by [Joseph Hadzima, Esq., Sr. Lecturer, MIT Sloan School of Management, President and Co-Founder of IPVision](https://info.ipvisioninc.com/blog/author/joseph-hadzima-esq-sr-lecturer-mit-sloan-school-of-management-president-and-co-founder-of-ipvision) ## [Twitter: Great IPO but are IP Storm Clouds on the Horizon?](https://info.ipvisioninc.com/ipvisions/bid/72202/twitter-great-ipo-but-are-ip-storm-clouds-on-the-horizon) [![](https://info.ipvisioninc.com/hs-fs/file-373424671-png/images/twitter_logo_blue-resized-600.png) ](https://info.ipvisioninc.com/ipvisions/bid/72202/twitter-great-ipo-but-are-ip-storm-clouds-on-the-horizon) The first day of Twitter's IPO was spectacular with the stock soaring [73% by the end of the first day of trading](http://www.reuters.com/article/2013/11/07/us-twitter-ipo-idUSBRE99N1AE20131107).  However, there are storm clouds on the horizon.  As reported by [Ingrid Lunden](http://http://techcrunch.com/author/ingrid-lunden/) in [TechCrunch](http://http://techcrunch.com/2013/11/04/ibm-claims-twitter-infringes-on-at-least-3-of-its-patents-according-to-twitters-latest-s-1-update/) IBM has alleged that Twitter infringes on "at least three U.S. patents" held by IBM.   To understand this situation [IPVision mapped](http://www.ipvisioninc.com/interactive-patent-mapping/) these IBM patents as well as Twitter's own patent portfolio. [Read More](https://info.ipvisioninc.com/ipvisions/bid/72202/twitter-great-ipo-but-are-ip-storm-clouds-on-the-horizon) Categories: [Patent Assertion Entities](https://info.ipvisioninc.com/blog/topic/patent-assertion-entities) [Comments (0) | Add a Comment](https://info.ipvisioninc.com/ipvisions/bid/72202/twitter-great-ipo-but-are-ip-storm-clouds-on-the-horizon#comments-listing) - [Tweet](https://twitter.com/share) Load More ### Follow IPVision - [**](https://www.linkedin.com/company/381481?trk=tyah&trkInfo=clickedVertical%3Acompany%2CclickedEntityId%3A381481%2Cidx%3A2-4-5%2CtarId%3A1457382100602%2Ctas%3Aipvision) - [**](https://twitter.com/ipvisioninc) ### Subscribe via Email ![landscape-map.png](https://info.ipvisioninc.com/hs-fs/hubfs/ipvision-site/images/landscape-map.png?width=103&name=landscape-map.png "landscape-map.png") ### Create a patent landscape map Patent citation analysis that makes it simple to explore complex relationships with a visual guide [Learn More](https://info.ipvisioninc.com/view-patent-landscape-map) ### Categories - 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