View single post by Mike Kearns
 Posted: Sun Jan 23rd, 2022 11:26 pm
PMQuoteReplyFull Topic
Mike Kearns

Joined: Fri Nov 24th, 2006
1931 - May 29, 1931, Frederik Ljungstrom files for his American fan patent. Of possibly special interest, he proposes to use his flexible ribbon blade concept as a radiator fan replacement in automobiles, see figure 9:

Followed by U.S. Design Patent 84,642, Filed June 1, 1931 -

Last edited on Mon Jan 24th, 2022 01:25 am by Mike Kearns