Patents Assigned to Esco, Inc.
  • Sign frame
    Patent number: 4441269
    Abstract: A sign structure of the type having a pluality of elongated sign frame elements defining a sign frame and a facing material covering at least one face of the sign frame. The improvement relates to an improved sign frame structure, an improved facing material gripping mechanism and an improved facing material tensioning device.
    Type: Grant
    Filed: March 9, 1982
    Date of Patent: April 10, 1984
    Assignee: Esco, Inc.
    Inventor: Byron M. Dahl
  • Sign frame
    Patent number: 3934365
    Abstract: A sign of the type generally intended for internal illumination having a sign frame, a flexible material covering at least one face of said sign frame, and means for supporting the flexible material over the face of the sign frame and for stretching and tensioning such flexible material.
    Type: Grant
    Filed: June 17, 1974
    Date of Patent: January 27, 1976
    Assignee: Esco, Inc.
    Inventors: Clinton L. Stein, Dennis D. Holien