Did Lewis Latimer invent the light bulb? His 1882 patent made its filament for Edison’s rival
Patent US 252,386 covers a cardboard-envelope method for baking carbon filaments, and Latimer assigned it to Hiram Maxim's company before joining Edison's.
Thomas Edison
Edison’s ‘10,000 ways that won’t work’ began as a 1910 battery story, not a light bulb
The earliest record, a 1910 biography, has Edison telling associate Walter S. Mallory he knew "several thousand things that won't work" after a decade-long battery hunt.