The Cutting Edge II: Hummingbird Feeders
10,000 Birds
NOVEMBER 10, 2020
8,522,717 is titled “Top-Fill Hummingbird Feeder,” and it was issued in September 2013. This latter style suffers from the problem that it must be refilled very often, because the level of food is constantly being reduced by the feeding. The patent then identifies the problem: The so-called “vacuum-type” feeders also have problems.
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