A new legal challenge in the US is targeting Samsung foldable phones, with claims that could have serious implications if they hold up in court.

Lepton Computing LLC has filed a patent infringement lawsuit (via SeoulWire) against Samsung Electronics and its US subsidiary in the US District Court for the Eastern District of Texas.

The complaint alleges that Samsung Galaxy Z Fold and Z Flip foldable phones, along with its new Galaxy Z TriFold, infringe on a portfolio of nine patents tied to foldable smartphone technology.

The patents cited in the filing cover a wide range of enabling technologies that define modern foldables. This includes hardware structure, hinge design, and display protection, but also software behavior.

One key example is App Continuity, where an app seamlessly transitions between the outer and inner displays depending on whether the device is folded or unfolded.

The complaint also details how internal components are arranged within tight spatial constraints. Sensors, magnets, cameras, and speakers must all coexist with a flexible OLED panel that bends within a controlled radius.

Lepton positions itself as an early pioneer in foldable devices. It also points to a prototype device called the “Lepton Flex,” which it describes as the first foldable smartphone developed in the US.

The company is targeting newer generations, starting from the Galaxy Z Fold 3 and later.

All of these remain allegations and requests. The court has not made any determination yet. For Samsung, this is another high-stakes legal battle in a category it effectively brought into the mainstream.

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