Patents by Inventor Margaret A. Erdall

Margaret A. Erdall has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

Door mounted advertising display chime

Patent number: D306565

Type: Grant

Filed: March 2, 1987

Date of Patent: March 13, 1990

Inventors: James P. Pawlik, Margaret A. Erdall

Door mounted advertising display chime