It's like a patent for "a light bulb, but now with a thicker filament and a coating to make it more durable".
Compared to inventing the light bulb, it's a paltry invention. But it may well have been a big deal at the time, to customers who maybe couldn't use regular bulbs and had to resort to, I dunno, more durable acetylene lamps or something.
And of course it might have been tricky, figuring out just how to make an economical thicker filament, or finding an appropriate coating that didn't block too much light, and finding a way of applying it to lightbulbs in a mass-production context.
Compared to inventing the light bulb, it's a paltry invention. But it may well have been a big deal at the time, to customers who maybe couldn't use regular bulbs and had to resort to, I dunno, more durable acetylene lamps or something.
And of course it might have been tricky, figuring out just how to make an economical thicker filament, or finding an appropriate coating that didn't block too much light, and finding a way of applying it to lightbulbs in a mass-production context.