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Re:Building an E-Ink Laptop by Matrixik on Wednesday February 24, 2021 @01:28AM (#26247224)
They are constantly creating new patents:

https://patents.justia.com/assignee/e-ink-corporation

Re:Building an E-Ink Laptop by Nition on Wednesday February 24, 2021 @02:45AM (#26247627)
Man, I didn't expect that to be 36 pages long. Crazy amount of patents.