I think you are correct about the time of the original revolution. Marx's philosophy may have evolved from that. I thought 1848 sounded late but I was to ignorant to know and too lazy to research it. Thanks.
Still haven't had time to read the article, but it is accepted by many political philosophers, F.A. Hayek among them, that socialism and communism are both outgrowths of the rationalism of the French Revolution of the 18th century. IMO, it is no coincidence that the French Revolution included such things as a Reign of Terror.