score:16
The phrasing is a bit unfair, I think (and probably a misquote, as it turns out). The first important international patent agreement didn't exist until 1883, and the United States signed on 4 years later. Before that, all countries were free to discriminate against foreigners in patent applications. Even with that agreement, a person wanting patent protection in a member country had to file for it in that country. Thus the USA did still "ignore" British patents, just as the British ignored USA patents. There's nothing unique about the United States in this regard. It wasn't until 1970 that there was such thing as an International Patent
Now it may be true that the 1880's roughly coincides with the period of industrialization in the USA, but only at the very beginning of it. A person could argue that the USA joining the patent convention was a sign of its industrialization starting to, er, pick up steam. Before that, things were just not progressing on a scale where patents were an issue. In 1870 there were only about 100,000 US patents in place. By 1911 this had grown to over a million.
Now China is currently a signatory to both the agreements I mentioned above. As such their citizens, in theory at least, enjoy the benefits if they patent something.
Note that if you go back further in history, patents and copyrights were originally merely favors The King bestowed upon his favorites to help them prosper, regardless of who actually first invented/wrote the thing in question. In that environment, it would have been entirely appropriate for a patent or copyright to be ignored outside the issuing country. The general public having access to them on some kind of a merit basis is a relatively modern development.
It is possible that somebody is confusing the situation with Copyright, where the USA did have a bit of a piratical history.