EDUCATIONAL DISPLAY DEVICE AND METHOD

• US 3,584,401 A
• Filed: 07/01/1969
• Issued: 06/15/1971
• Est. Priority Date: 07/01/1969
• Status: Expired due to Term

• Current Assignee: Dively Lee Vaughn, William C. Cryer
• Original Assignee: Dively Lee Vaughn, William C. Cryer
• Inventors: Cryer, William C., DIVELY LEE VAUGHN
• Application Number:
  US04/842,433
• Time in Patent Office: 714 Days
• US Class Current: 434/425
• CPC Class Codes: G09B 29/00 Maps; Plans; Charts; Diagrams, e.g. route diagram star maps G09B27/04; devices for holding or supporting maps A47B97/02; for computing purposes G06G1/14, G09B1/16; display boards G09F

Abstract

AN EDUCATIONAL DISPLAY DEVICE AND METHOD OF MANUFACTURE ARE DISCLOSED INCORPORATING A NORMALLY DARK DEAD FRONT MATTE SURFACE OF PHOSOGRAPHIC FILM HAVING MULTIPLE SELECTED PATTERNS WHICH ARE REFLECTIVELY OPAQUE AND TRANSLUCENT TO A SELECTED BACKLIGHT AND WHICH ARE NORMALLY FRONTALLY VISUALLY INDISTINGUISHABLE FROM ADJOINING DARK OPAQUE BACKGROUND AREAS WHEN VIEWED UNDER LOW LEVEL REFLECTED ROOM LIGHT SUIABLE FOR READING AND WRITING AND AT A DISTANCE SUITABLE FOR CLASSROOM INSTRUCTIONAL PURPOSES. THE SELECTED PATTERN AREAS ARE DISPOSED IN REGISTRY WITH CORRESPONDING SELECTIVELY ILLUMINATABLE PATTERN FORMING CELLS SECUED BEHIND A BASE PANEL SHEET OF RIGID TRANSLUCENT LIGHT DIFFUSING MATERIAL.

Claims