Tell that to the inventor of Algebra, Al-KhwarizmiTell that to my dead beat step kids.
Or to the guy who invented photography, Nicéphore Niépce.
Or the guy who invented Mormonism, Joseph Smith.
These guys didn't patent a product or build a lasting structure. They just had an idea that that took hold in the lives of people, and passed down. Their work is done, their history has been written; Their names will be the remembered as long as there continues to be written history. And where is the immortal object they created? There never was one. No need for it. But the name of Joseph Strauss, the engineer of the Golden Gate Bridge will fade from notoriety when the bridge gets condemned and torn down. Nobody cares who designed a bridge that isn't around anymore, no matter how many decades it stood.