Bass files 16th IPR petition as opposition continues to build

Managing IP is part of Legal Benchmarking Limited, 1-2 Paris Gardens, London, SE1 8ND

Copyright © Legal Benchmarking Limited and its affiliated companies 2026

Accessibility | Terms of Use | Privacy Policy | Modern Slavery Statement

Bass files 16th IPR petition as opposition continues to build

Kyle Bass has filed another IPR petition targeting a pharma company, taking aim again at the Vimovo pain reliever, while IPO has passed a resolution opposing the use of post-grant proceedings to manipulate the market

kyle20bass20150.jpg

The Coalition for Affordable Drugs has filed its 16th inter partes review (IPR) petition, taking aim for a second time at the Vimovo treatment made by Pozen and sold by Horizon Pharma in the US. Vimovo is an arthritis pain reliever.

Kyle Bass, who runs hedge fund Hayman Capital, and Erich Spangenberg, owner of nXn Partners, are behind the coalition. IP Nav is also involved.

I spoke to Bass last month for our June cover story and he made very clear that he is serious about taking on pharmaceutical and biotech companies through Patent Trial and Appeal Board proceedings and that he will not give up.

You can read the full story, including an analysis of Bass’s strategy, the response from IP practitioners and trade groups, and the potential action from Congress and the Board here (only available to subscribers and trialists – you can take out a trial to the site here).

Bass underlined that he is filing merit-based IPRs with the expectation of seeing the challenge through to a final decision by the PTAB. Hayman Capital says it will not accept settlement payments to drop its challenges.

Bass praised the IPR system. "It is very pro-competitive," he told me. "It was designed to mine-clear patent trolls in the tech space, and now it is allowing firms like ours to challenge patent squatters."

Pharma and bio patent owners have not taken lightly to Bass’s provocation. BIO labeled his strategy “a new door to abuse of the patent system”, and accused him of using PTAB proceedings to short sell stock.

Last week, the PATENT Act was reported to the full Senate and included a new provision allowed the PTAB to deny petitions “in the interest of justice”. This was likely drafted with PTAB strategies such as Bass's in mind. 

And this week IPO passed a resolution opposing the use of post-grant proceedings to manipulate the market.

The resolution said: “IPO believes it is an abuse to file AIA petitions for post grant proceedings by persons who have a significant bet against, or short, of the shares of the patent owners owning the patents challenged in the petitions; now, therefore, IPO urges the United States Patent and Trademark Office to use its discretion to deny petitions filed by such persons.”



Only 30% of our content is published on our blog – to access all of our content you need to be a subscriber.

We like to offer our loyal blog readers a special rate, so register your interest in coming on board as a subscriber and we will be in touch shortly.

  

more from across site and SHARED ros bottom lb

More from across our site

News of Nokia signing a licensing deal with a Chinese automaker and Linklaters appointing a new head of tech and IP were also among the top talking points
After five IP partners left the firm for White & Case, the IP market could yet see more laterals
The court plans to introduce a system for expert-led SEP mediation, intended to help parties come to an agreement within three sessions
Paul Chapman and Robert Lind, who are retiring from Marks & Clerk after 30-year careers, discuss workplace loyalty, client care, and why we should be optimistic but cautious about AI
Brantsandpatents is seeking to boost its expertise across key IP services in the Benelux region
Shwetasree Majumder, managing partner of Fidus Law Chambers, discusses fighting gender bias and why her firm is building a strong AI and tech expertise
Hady Khawand, founder of AÏP Genius, discusses creating an AI-powered IP platform, and why, with the law evolving faster than ever, adaptability is key
UK firm Shakespeare Martineau, which secured victory for the Triton shower brand at the Court of Appeal, explains how it navigated a tricky test regarding patent claim scopes
The firm’s managing partner said the city is an ‘exciting hub of ideas and innovation’
In our latest podcast, Deborah Hampton talks through her hopes for the year, INTA’s patent focus, London 2026, and her love of music
Gift this article