1975: And the Changes To Come

Wash Dishes Ultrasonically. High frequency sound waves energize the water to wash the dishes in this ultrasonic dishwasher. A device called a transducer produces the high frequency sound waves (about 20,000 cycles per minute), pitched so high they cannot be heard by the human ear. Ultrasonic washers are more effective than existing types; they scour without scratching, remove baked-on matter readily, and wash much faster than any type now in general use. The same principle of ultrasonic cleaning will be applied to washing machines within another decade.


from 1975: And the Changes To Come by Arnold B. Barach

kartfamily, tbn97 and 2 more people faved this
  • Aaron T 7y

    20,000 cycles per minute, huh? Far from being inaudible, that's just E above middle C (333 Hz). But even 20,000 Hz would be audible to some people, particularly children.
  • mr. eihorn 7y

    aaaarrgghh.. i just imagined a device working for an hour in this pitch! i would easily go crazy there!
  • Derrick Bostrom PRO 7y

    I confirmed with the book -- it does indeed say "per minute." It seems like a typo, but it wasn't mine at least.

    Anyway, I just like the dishware patterns.
  • Anna PRO 7y

    That is a very sonic dishwasher...
    If it had 30 kHz+ ... I want one.
  • SergeiRichard 5y

    So whatever happened to the ultrasonic dishwasher? Oddly, I remember something from my childhood that may explain it.

    My father knew someone whose company was involved with research into ultrasonic dishwashers in the late 60s or early 70s. Apparently they gave up when they examined walls near the experimental machine, to find pulverized mortar was trickling from between the bricks...
  • Aonghais MacInnes 5y

    Might not clean the dishes, but it'll be sure to rid your home of pesky rodents!
  • parkan 5y

    Ultrasonic cleaners are very commonly used in lab settings, and they work great. In Japan, some eyeglass stores will set those out on the street (!) so passerby can clean their glasses, as a promotion. I'm really not sure why a dishwasher sized implementation isn't readily available, though it might be that designing a transducer to work in the large, relatively complex space is prohibitively expensive (the lab versions are very small and clean one thing at a time).
  • sputnikhousewares 5y

    Wow! Syracuse China in the Finesse pattern!
  • tbn97 PRO 5y

    Hmmm. Well the ultrasonic washingmachine was briefly around in the late 90s...
  • James Blah PRO 4y

    Just don't put your hands in it when it is working! those lab ones could pulverize your bones!
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Taken on December 31, 2007
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