SK Hynix Challenges AMT Semiconductor Patent At PTAB

(Source: SK Hynix)

SK Hynix has filed a petition for inter partes review at the Patent Trial and Appeal Board, seeking to invalidate U.S. Patent No. 8,593,888, a "Semiconductor Memory Device" patent owned by Advanced Memory Technologies LLC. The petition was lodged on August 22, 2025. 

The move comes in response to litigation AMT filed in December 2024 in the Eastern District of Texas, where the Texas-based company accused SK Hynix of infringing five patents related to flash and DRAM circuit technologies. In an amended complaint filed on April 2, 2025, AMT alleged that SK Hynix's NAND flash and DRAM products — including Gold P31 and Platinum P41 solid-state drives, as well as LPDDR5x and DDR5 memory chips — practiced the asserted technologies. 

The patents at issue, issued between 2010 and 2013, cover innovations in booster circuits, voltage generation, and non-volatile memory design. Alongside the '888 patent, AMT's infringement suit also names U.S. Patent Nos. 7,777,557, 7,920,018, 7,969,231, and 8,400,835. 

AMT claims SK Hynix has directly and indirectly infringed by selling and supplying accused products to major U.S. technology companies, including Dell, NVIDIA, Microsoft, and AMD, and argues that the Korean chipmaker's conduct has been willful since at least 2022. The company is seeking damages, treble damages for willful infringement, attorneys' fees, and an injunction. 

The PTAB case is IPR2025-01449, and the district court case is Advanced Memory Technologies LLC v. SK Hynix Inc., case number 2:24-cv-01078, in the U.S. District Court for the Eastern District of Texas.

In a parallel front, AMT also filed suit against Micron Technology Inc. in June 2025 in the Western District of Texas, case number 1:25-cv-01036, asserting four patents: U.S. Patent Nos. 7,920,018, 7,969,231, 8,519,778, and 8,593,888. 

Notably, three of those patents — the '018, '231, and '888 — overlap with those asserted in the SK Hynix litigation, underscoring AMT’s broader enforcement campaign targeting memory chipmakers.

By PatenTrip