Weird Patent of the Day
Portable self-cleaning door mat
A self-cleaning door mat with a hollow frame and a substantially rigid top plate formed with depressed apertures. The crests of the depressions are covered with felt or other soft material to remove dirt from shoes. Spring-mounted valve members close the apertures and are unseated when stepped on.
Source: United States Patent and Trademark Office, www.uspto.gov. Official PDF: USPTO patent PDF. Also at Google Patents. The drawing on this page is a reduced copy of the official figure; see the original drawing.
