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Another Example of Claim Differentiation

Claim differentiation was one factor that led the Federal Circuit to affirm the PTAB’s claim construction in the appealed IPR in Realtime Data, LLC v. Iancu (Fed. Cir., Appeal No. 2018-1154, decided Jan. 10, 2018).  This case also involves an interesting issue regarding obviousness and motivation to combine, and Dennis Crouch has summarized that issue on his blog at  This quick post below focuses on the claim construction of the phrase “maintaining a dictionary.” By way of background, the opinion notes that “dictionary encoding is a form of lossless data compression that assigns a code word to a particular data string, maps that code word to an index, and replaces every matching data string with the corresponding code word…This assignment would be mapped to an index, or dictionary.” The independent claim at issue reads: 1. A method for compressing input data comprising a plurality of data blocks, the method comprising…

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