Dear Rich: I wonder if you can help. My great-grandfather patented several steel inventions back in the early 20th century in the U.S. How do I find these and what happened to them after he died in 1941? Do the next of kin have any rights to them? I'm so glad you asked. The short answers to your questions are: (1) you can find out more about the patents at the
Google Patents site, (2) anything patented in the early 20th century is in the public domain now, and (3) there are no rights in public domain inventions. The
Dear Rich staff recommends
Google Patents instead of the
U.S. Patent and Trademark Office searching site because Google is easier to use and more comprehensive. Try the
Advanced Search feature to search by inventor name. Prior to 1995, U.S. patents had a duration of 17 years, after which the invention is
free for anyone to use or manufacture. We wonder if your great-grandfather was one of those early 20th Century steel pioneers who gave us
stainless steel, modern
dry-blasting, or a revolutionary method of making
rails. (Digression Dept.: Speaking of steel, the
Dear Rich staff learned today that it takes 7 kg (15 lbs.) of steel to manufacture a bicycle and 816 kg (1800 lbs) to manufacture a car. No wonder H. G. Wells
said, "When I see an adult on a bicycle, I do not despair for the future of the human race.")