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WRT your other "bagless" machine, I was informed that Dyson patented the cyclone dust seperation system for vacuum cleaners so well that no other brand can come even close to their efficiency. Every other "bagless" vacuum cleaner uses a paper or foam filter to stop the dust from leaving the machine, which of course clogs up and causes the machine to lose suction.....so basically instead of changing a full bag with the other brands you have to empty the cannister and then either change or clean a filter as well.
Hmm, but there is a few of them on the market. So I suspect the actual cyclone is not patentable, perhaps the method and application is and or design. This then allows for some variation or innovation design improvement/changes etc to get by the examiner.