Patent Infringement: Real Cases That Changed Technology

Patent infringement is when someone makes, uses, sells, or imports a patented invention without authorization from the patent holder. It sounds straightforward. In practice, it's the subject of billion-dollar litigation campaigns that have shaped which products exist, which companies survived, and how entire industries are structured.

What infringement actually is

Literal infringement — Every element of a patent claim is found in the accused product. If claim 1 requires elements A, B, and C, and the product has A, B, and C, you have literal infringement. Remove any element, and you may escape literal infringement.

Doctrine of equivalents — Even if a product doesn't literally satisfy every claim element, infringement can still be found if the accused product performs substantially the same function in substantially the same way to achieve substantially the same result. This doctrine prevents infringers from making trivial design-arounds that don't capture the claimed elements in exact words but achieve exactly the same thing.

Willful infringement — If an infringer knew about the patent and infringed anyway, courts can award enhanced damages up to three times the actual damages. This creates the concept of the "efficient infringer" — a company that deliberately weighs licensing cost against infringement risk. It's a real, if legally risky, strategy.

Case 1: Apple v. Samsung — $1 billion and counting

The most expensive consumer technology patent dispute in history. Apple sued Samsung in 2011 for infringing both utility patents (rubber-band scrolling, tap-to-zoom, slide-to-unlock) and design patents (the iPhone's rounded-rectangle form, icon grid). Samsung cross-sued.

The first jury verdict in 2012: $1.05 billion for Apple. Samsung appealed. The Supreme Court took the case on the design patent damages issue, ruling that design patent damages should be calculated on the infringing component (the phone screen) rather than the entire product. The case went back for retrial multiple times.

The lasting impact: manufacturers globally redesigned their Android UIs to create distance from Apple's patented interface patterns. The case also forced a serious look at design patent scope — what is the "article of manufacture" for a design patent on a smartphone component?

Case 2: NTP v. Research In Motion — $612.5 million

NTP, an NPE, held patents on wireless email transmission. RIM's BlackBerry allegedly infringed. The district court ruled for NTP, and the threat of an injunction shutting down BlackBerry service for millions of US users — including federal government employees — created enormous pressure.

RIM settled for $612.5 million in March 2006, one day before the court was to rule on the injunction. The USPTO subsequently rejected NTP's patent claims on reexamination — meaning the patents RIM paid $612.5 million to avoid litigating were likely invalid.

The case demonstrated the asymmetric power of patent injunctions: the threat of shutting down a commercially essential service created settlement leverage far exceeding the intrinsic value of the patents.

Case 3: Qualcomm v. Apple — Billions in the balance

Qualcomm holds foundational patents on CDMA and LTE modem technology — the patents underlying cellular connectivity in virtually every smartphone. Apple paid Qualcomm royalties for years, then sued Qualcomm in 2017 alleging anticompetitive licensing practices and seeking to stop royalty payments. Qualcomm counter-sued for patent infringement.

At stake: Qualcomm sought royalties based on the entire device price (1–5% of the iPhone selling price), which Apple argued vastly exceeded the value of the modem component. The case involved parallel litigation in multiple countries, regulatory investigations in the US, EU, and Korea, and Intel's position as Apple's alternative modem supplier.

The 2019 settlement was announced the day Qualcomm's CEO was scheduled to testify. Intel immediately announced it was exiting the 5G modem business — removing Apple's alternative supplier and reinforcing Qualcomm's position. Financial terms weren't disclosed, but analysts estimated the settlement at approximately $4.5 billion.

Case 4: VirnetX v. Apple — $502 million

VirnetX holds patents on secure communications protocols — VPN and direct-connection technologies. After years of litigation, including multiple trial and retrial cycles, Apple was found to infringe and ordered to pay $502.6 million in damages.

VirnetX is a textbook NPE: it has no products. Its entire business is patent licensing litigation. Apple argued its FaceTime and VPN-on-Demand features didn't infringe, redesigned them during the litigation, then disputed whether the redesign eliminated infringement. As of the mid-2020s, portions of the litigation continue.

The case illustrates the durability of NPE litigation: even after Apple won one trial, VirnetX won a subsequent one. Patent litigation can span a decade.

Case 5: i4i v. Microsoft — $290 million and a Supreme Court ruling

i4i, a small Canadian company, held a patent on a method for editing documents that stored the markup separately from the content — a specific XML processing approach. Microsoft's Word 2003 allegedly infringed. A jury agreed and awarded $290 million.

Microsoft appealed all the way to the Supreme Court, arguing that the standard for invalidity in civil litigation should be a "preponderance of the evidence" rather than "clear and convincing evidence." The Supreme Court unanimously ruled for i4i in 2011: the clear and convincing evidence standard applies to invalidity challenges in court. This ruling, Microsoft Corp. v. i4i Limited Partnership, remains controlling law — it's harder to invalidate a granted patent in court than Microsoft argued it should be.

Microsoft ultimately removed the infringing XML functionality from Word and paid the damages.

What these cases teach

Documentation matters before the suit, not after. In every case where prior art was relevant, the parties that had documented their design processes, invention dates, and independent development had stronger defenses.

Continuation patents extend fights. Filing continuation applications — new applications claiming priority to a parent application — lets patent holders pursue additional claims after seeing how defendants respond. The continuation patent portfolio is a litigation strategy, not just a prosecution strategy.

Injunctions are the nuclear option. Post-eBay v. MercExchange (2006), courts apply a four-factor test before granting patent injunctions rather than granting them automatically on infringement findings. This reduced the settlement leverage of NPEs who couldn't demonstrate irreparable harm from infringement. But the threat of injunction in standard-essential patent cases remains powerful — as the Qualcomm dispute showed.

Design-arounds can win. Multiple defendants in these cases successfully modified products to eliminate infringement, then disputed whether damages applied to the redesigned version. A credible design-around is a litigation defense and a settlement lever.

Browse the patents central to these disputes — and thousands of others — in the PatentBrief patent explorer.

PatentBrief is not a law firm. Nothing here is legal advice.