Sidney Rosenthal

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Sidney N. Rosenthal ( 1906 or 1907 , † 1979 ) from Richmond Hill, New York City , was an American inventor . In 1952 he invented the felt-tip pen , which he then called “Magic Marker”.

He put waterproof ink in a small glass container and attached a piece of felt to the opening. A cap protected the felt tip from drying out. Forerunners (without a glass tank) had been around since the 1940s.

From 1952 Rosenthal's company Speedry Chemical Products in Richmond Hill, Queens , manufactured the Magic Marker . This invention was later modified several times by others (e.g. plastic tip instead of felt tip). In 1958 , Carter Inc. began marketing slimmer felt-tip pens with an aluminum body instead of glass. Speedry went to court for patent infringement, but lost the process.

When competitors used water-soluble inks, business began to deteriorate. In 1965 Rosenthal sold his shares in the listed Speedry , five years later he sold the naming rights to Magic Marker . Rosenthal died at the age of 72.

Individual evidence

  1. ^ A b c Marc Siegelaub: Indelibly Devoted; Marker-maker's widow fights for his fame . In: Newsday . January 14, 2003, p. B03 ( online ).
  2. http://inventors.about.com/library/inventors/blpen.htm