# Wilhelm B Gruber — Patents explained on PatentBrief

Wilhelm B Gruber has 1 landmark patent explained in plain English on PatentBrief.

- [How the View-Master 3D Image Viewer Works](https://patentbrief.org/patent/us/2189285/view-master-stereoscope) — granted 1940
  A 1939 invention for a handheld device that uses two offset images to create the illusion of depth, famously known as the View-Master.

**Full profile:** https://patentbrief.org/inventor/wilhelm-b-gruber

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