And, don't read patent application publications and mistake them for patent publications. The USPTO labels the granted publication with a B after the number. In

And, don't read patent application publications and mistake them for patent publications. The USPTO labels the granted publication with a B after the number. In this case, the granted patent (https://patents.google.com/patent/US8595637B2/ https://patents.google.com/patent/US8595637B2/) has seen amendments to the claims during examination before grant.