Is there a patent on the sole of Birken shoes?

Yes According to official website query enterprise search network, Boken shoes created the first pair of comfortable shoes with Boken footprints in 1963, and Boken shoes developed foot paper and patented insoles that have been applied for in many countries. Therefore, the sole of Birken shoes is patented. Birken shoes appeared in the middle of18th century and were designed by German and British designers. At first, there was only one style of slippers. Later, after more than 200 years of development, it was derived.