# Sidney N Rosenthal — Patents explained on PatentBrief

Sidney N Rosenthal has 1 landmark patent explained in plain English on PatentBrief.

- [How a Simple Felt-Tip Marker Works](https://patentbrief.org/patent/us/2713176/magic-marker-permanent-marker-rosenthal) — granted 1955
  A 1953 design for a handheld marking tool that uses a porous tip to deliver ink from an internal reservoir.

**Full profile:** https://patentbrief.org/inventor/sidney-n-rosenthal

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_Source: PatentBrief — https://patentbrief.org. Plain-English explanations of US patents._