# Spencer Ferguson Silver — Patents explained on PatentBrief

Spencer Ferguson Silver has 1 landmark patent explained in plain English on PatentBrief.

- [Sticky, Tiny Plastic Balls Made from Acrylates](https://patentbrief.org/patent/us/3691140/post-it-repositionable-adhesive) — granted 1972
  This 1972 patent describes how to make tiny, sticky, and durable plastic balls (microspheres) using a specific mix of acrylate chemicals and a special water-based process.

**Full profile:** https://patentbrief.org/inventor/spencer-ferguson-silver

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