At a Glance
The Patents at Stake
The '906 patent claimed a method for a browser to automatically launch an external application — a plug-in or applet — to display and run interactive content embedded in a hypermedia document. Eolas argued this covered how browsers handle embedded media, from ActiveX controls to plug-ins.
A later continuation of the same invention, asserted in the 2009 campaign against a who's-who of web companies. Together the two patents were used to claim ownership of the interactive web itself.
The Timeline
1994
The invention at UCSF
Michael Doyle and colleagues at the University of California demonstrate embedding interactive objects in a web browser and file for a patent. The work predates the commercial web most people would come to know.
1998
The '906 patent issues
US 5,838,906 is granted to the University of California and exclusively licensed to Eolas Technologies, Doyle's company.
1999
Eolas sues Microsoft
Eolas and UC sue Microsoft, alleging that Internet Explorer's handling of embedded objects — plug-ins and ActiveX controls — infringes the '906 patent.
2003
Jury: ~$521 million
A Chicago jury awards roughly $521 million. The verdict alarms the entire web industry, because the patent appears to read on something every browser does.
2003–2006
The web fights back — and IE changes
The W3C and Tim Berners-Lee urge the Patent Office to reexamine the '906 patent, citing the earlier Viola browser as prior art. To design around it, Microsoft alters Internet Explorer so embedded controls require a 'click to activate' — a change millions of users felt.
2005–2007
Award vacated, then a settlement
The Federal Circuit vacates the $521 million award and remands. In 2007 Microsoft and Eolas settle on undisclosed terms, ending that chapter.
2009
Eolas sues the rest of the web
Armed with the '906 and a new continuation, Eolas sues some two dozen companies — Apple, Google, Amazon, Yahoo, and more — in the Eastern District of Texas, effectively claiming to own interactive web pages.
2012–2013
Berners-Lee testifies; the patents fall
At trial, the inventor of the web himself testifies about pre-1994 prior art. The jury finds the Eolas patents invalid, and the Federal Circuit affirms — erasing the claim to the interactive web.
The Outcome
From a $521M win to invalid — with the web's inventor on the stand.
Eolas got the headline verdict and a confidential settlement from Microsoft, and for a while looked unstoppable. But when it tried to convert one win into a tax on the entire web — suing the largest internet companies at once — it provoked a defense those companies could fund and the technical community would back.
At the 2012 trial, Tim Berners-Lee testified about the Viola browser and other work that predated the patent. The jury found the patents invalid, and the Federal Circuit affirmed in 2013 — ending the claim to own interactive web pages. The verdict against Microsoft had been real; the underlying patents, in the end, were not upheld.
What It Changed
A patent visibly changed how the web felt
To avoid the '906 patent, Microsoft made Internet Explorer require an extra click before embedded content — Flash, ActiveX, applets — would run. For a couple of years 'click to activate' was a small daily friction for millions of users, one of the clearest cases of a patent reshaping software people use every day.
Community prior art beat a billion-dollar claim
The patents ultimately fell to prior art the web's own pioneers surfaced — the Viola browser, demonstrated before the patent's 1994 priority date — with Tim Berners-Lee testifying in person. It's a landmark example of the technical community, not just a defendant's lawyers, defeating an overbroad patent.
Overreach triggered the collapse
Eolas won half a billion dollars from one company, then tried to tax the entire web by suing everyone at once. That overreach is exactly what drew the coordinated invalidity attack that wiped out the patents. The recurring lesson of these battles: the broadest assertion often invites the ruling that destroys it.
From PatentBrief
What is prior art — and how does it kill a patent? →
The Viola browser sank Eolas. See how a single earlier reference can invalidate a patent — and how to search for it before you file.