Which search engine patented the concept of “TrustRank” as a methodology to rank websites and webpages?

Which search engine patented the concept of “TrustRank” as a methodology to rank websites and webpages?

TrustRank is an algorithm that conducts link analysis to separate useful webpages from spam and helps search engine rank pages in SERPs (Search Engine Results Pages).
Similarly, Search engines have many different algorithms and ranking factors that they use when measuring the quality of webpages.
Yahoo! patented the concept of “ TrustRank ” to rank websites and webpages.

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