In 1942 Lamarr and composer George Antheil patented (US 2292387) a "secret communication system" designed to prevent enemies from jamming radio-controlled torpedoes. The invention was based on radio "frequency-hopping" and forms the basis of modern wireless communications systems. Lamarr's patent has been cited in 36 patents since 1976, including most recently in US 8031129, and in ~70 documents indexed in Google Scholar.
I'm the librarian for research services in the Engineering and Science Library at Queen's University in Kingston, Ontario. I've been working with patent information since 1991, including seven years at the U.S. Patent and Trademark Office. I believe that the dissemination of patent information is a public good and should be promoted, especially in the education of science and engineering students.