Complex sentence: Application for Czechoslovak patent was filed on 8 November 1990, the patent was approved on 26 October 1992, and ut was patented in USA on March 16,1993, with patent number US5,193,809.
Split into simpler sentences: Application for Czechoslovak patent was filed on 8 November 1990, the patent was approved on 26 October 1992. On March 16,1993, it was patented in the USA with patent number US5,193,809.