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Class Information
Number: 40/459
Name: Card, picture, or sign exhibiting > Changing exhibitor > Door operated
Description: Device wherein the movement of a closure such as a gate or a door causes movement of the display device.

Patents under this class:

Patent Number Title Of Patent Date Issued
8169317 Hands-free door opening system and method May. 1, 2012
7571694 Occupancy indication device and method Aug. 11, 2009
7068179 Hands-free door opener and method Jun. 27, 2006
6967587 Hands-free door opener and method Nov. 22, 2005
5014472 Tombstone May. 14, 1991
4881335 Door sign device Nov. 21, 1989

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