Almost not patent burdened

[eaglgenes101]

Four of the five patents cited in the original CTW page were filed in 1997, and thus expired in 2017:

https://www.google.com/patents/US6150966

https://www.google.com/patents/US5864308

https://www.google.com/patents/EP0913035B1

https://www.google.com/patents/EP0855803A1

And the last one is just a mere two weeks from expiring:

https://www.google.com/patents/US5986591

Further searching of the inventors/assignees yielded no further patents.

Unless I missed something, Context Tree Weighting will be free from patent encumbrance very soon!