My grandfather had a patent. He build a milk container with a bag around it that would sweat water. This would keep the milk cooler. But around 1935 the Rural Electric Administration (REA)and refrigeration put a dent in his sales.
I thought it would be convenient if typewriters had a buffer of, say, ten keypresses before they actually struck keys to paper. Then an experienced typist could have erased the wrongly struck key instead of having to fuss with erasers and other correction methods.
Typing used to be not dissimilar from typesetting.
I guess you all know what happened. Time eroded the value of my idea. Other techniques and technologies made it obsolete.
Good thing, too. It wouldn't have lasted long.
Time is eroding my other ideas too. But some of them still have currency. And you never know what I may come up with next. I'm very inventive. It's the plus side of being lazy.