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Re:Google's PageRank patent has expired (2019) by 988747 on Wednesday June 01, 2022 @10:05AM (#31581962)
From your linked Wikipedia page:

"it is executed at query time, not at indexing time, with the associated hit on performance that accompanies query-time processing" - for a search engine that planned to take over the Web that might have been a dealbreaker.

Re:Google's PageRank patent has expired (2019) by iamcurious on Wednesday June 01, 2022 @11:11AM (#31582980)
Seems like an obvious optimization though. Is that enough to grant a patent?