# Theophilus Van Kannel — Patents explained on PatentBrief

Theophilus Van Kannel has 1 landmark patent explained in plain English on PatentBrief.

- [How the Revolving Door Was Invented](https://patentbrief.org/patent/us/387571/revolving-door-van-kannel) — granted 1888
  The 1888 patent for the revolving door, designed to keep buildings warm while allowing people to enter and exit easily.

**Full profile:** https://patentbrief.org/company/theophilus-van-kannel

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