It was first commercialized by the Swiss company Büchi , and the Büchi '' Rotavapor '' continues to be the most widely used rotary evaporator , so much so that '' Rotavap '' has become a synonym for such instruments .
It was first commercialized by the Swiss company Büchi in 1957 , and patented in 1964 . 
 Patent GB1039709 The Büchi '' Rotavapor '' continues to be the most widely used rotary evaporator , so much so that '' Rotavap '' has become a synonym for such instruments .