U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

"Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible."

Simon Newcomb, astronomer ; Said in 1902, less than two years before the first flight at Kitty Hawk

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Class D07/554.4 - Symmetrical

Subclass of Class D07 - Equipment for preparing or serving food or drink not elsewhere specified
Definition: Design that shows identical halves if divided through
No. of patents: 4
Last issue date: 03/08/2011