History credits Edison and Bell for the modern illuminated world, but a self-taught draftsman made many of those ideas practical, patentable, and durable. This episode explores the life of Lewis Howard Latimer, who rose from teenage office boy to drafting the blueprints of the modern era. We begin with his parents' escape from slavery and the Fugitive Slave Act that shaped his relentless drive.

We trace his path from Navy landsman to head draftsman at a patent firm, where he learned high-stakes patent drawing by observation. We cover his work drafting Bell's telephone patent and, crucially, his invention of a process that made carbon filaments durable enough to mass-produce, effectively beating Edison at his own game while working for a rival.

• Why patent drafting was reverse-engineering cutting-edge mechanics on legally bulletpro ...