Louis Rosen was a prolific inventor, who obtained several patents for inventions between the years 1918 and 1969. Here are eight of these patents, available as Adobe™ PDF files.

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• An improvement in the film transport mechanism for a camera - 1918
  
  
• An improvement in the film transport mechanism for a camera - 1921
  
  
• An improved method for attaching electrical wires - 1930
  
  
• An improvement the design of a safety razor - 1934
  
  
• An improvement in the design of a campaign-type button - 1955
  
  
• An improvement in the design of a pin-on identification badge - 1960
  
  
• An improvement in the design of a pin-on identification badge - 1961
  
  
• A device to allow for the easy and clean disposal of tea bags - 1969