Also not sure about a name, but in Greek mythology, there's Daedalus. He built a massive maze, which was then used against him to imprison him & his son. Daedalus crafted wings out of feathers & beeswax to escape the island of Crete, but his son Icarus flew too close to the sun. Melting the wax, destroying the wings, and drowning in the sea.
To be fair, he gave adequate warning to Icarus. The fault with the wax wings doesn't lie in the inventor or invention, but pure simple user error not following the directions.
Didn't own the company just the sole British distribution rights
edit to add: He lived on the south coast, used and enjoyed the product, and was moving out of the way for a pedestrian on a narrow path and went backwards over the cliff edge. A tragedy that doesn't belong in this thread.
It would only be ironic if it were a lifesaving device, for instance, if the creator of the defibrillator went into cardiac arrest by an accidental misfiring of the defibrillator on him.
Irony requires a reasonable expectation of an opposite outcome.
A solar eclipse happening on a cloudy day is not ironic, it's merely unfortunate. A song about things claiming to be ironic actually containing nothing that will qualify as ironic is ironic.
Irony can be used in many situations. I want a German word that specifically refers to this situation. Something like Erfinderhybris; I just slammed Inventor and Hubris together.
Alfred Nobel might be considered a runner up, but I feel he recovered his reputation. That and I don't think anyone but himself really was upset with the path his invention took.
I know you wanted a word, but I nominate "Midgley" to be the new word for that. "To midgley something" is to attempt to create something of value that instead only makes things worse. It's an improvement in the negative direction.