# Billy F. Rankin — Patents explained on PatentBrief

Billy F. Rankin has 1 landmark patent explained in plain English on PatentBrief.

- [How Polystyrene Sulfonate Helps Treat Dry Eye Symptoms](https://patentbrief.org/patent/us/3987163/indomethacin) — granted 1976
  A 1975 patent for an eye drop solution that uses a specific polymer to lubricate and cushion the eye, especially for contact lens wearers.

**Full profile:** https://patentbrief.org/inventor/billy-f-rankin

---

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