Been posted here before, several times.
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2168298&page=1
Reading that thread, at first glance the patch test appeared to be something that could be used to judge filters. Upon further review though, based on the results, the test validity and reliability were debunked.
Several filters using the exact same media, eg., Fram Extra Guard/High Mileage, Wix/NapaGold showed very different 'patch test' results.
Also Puro Classic showed significantly better results than P1. And as mentioned above, Pro Select showed better results than Napa Gold. Subjective uncontrolled patch test results don't invalidate ISO Testing done in a lab.
So, the best part of the testing is the dissection pics, excellent. The 'patch test' results, unreliable.
The best testing of filters I've seen done relatively recently was done by Bitog member river_rat. And interestingly, his results confirmed much of the ISO test results and performance ratings of oil filters. And, one of his testing results showed that oem filters deigned similar to Toyota oil filters,, no end cap type, aren't very efficient. A result that has been recently confirmed by the Amsoil test of oem filters.
Links to the testing thread and summary site link are posted below.
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1693153&page=1
Oil Filter Comparisons from the Workbench, Summary