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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
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| Posted: Sun Jan 23rd, 2022 11:26 pm |
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Mike Kearns
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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 |
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