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The Federal Circuit, in HD Silicon Solutions LLC v. Microchip Technology, Inc., No. 2023-1397 (Fed. Cir. Feb. 6, 2025), reiterated that extrinsic evidence may be used only to assist in the proper understanding...
The Federal Circuit, in HD Silicon Solutions LLC v.
Microchip Technology, Inc., No. 2023-1397 (Fed. Cir. Feb. 6,
2025), reiterated that extrinsic evidence may be used only to
assist in the proper understanding of the disputed limitation; it
may not be used to vary, contradict, expand, or limit the claim
language from how it is defined, even by implication, in the
specification or file history.
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