How many patents are in the name of Albert Einstein?

Some speculators say his patent count was over 20, but Einstein is recorded as having 12 patents. You would think he had more since he worked in the Bern Patent Office, but no. None of the 12 were just his though; every time, he had a co-inventor. And, interestingly enough, seven of the twelve were actually for the same invention...just patented in different countries and improvements to the invention (Kaeltemaschine).