The Educator® Canon FS-5   

Date of introduction:  1983 Display technology:  LCD
New price:   Display size:  8 (5 + 2)
Size:  5.2" x 2.8" x 0.25"
 132 x 70 x 6 mm3
Weight:  2.5 ounces, 70 grams Serial No:  
Batteries:  n.a. Date of manufacture:  
AC-Adapter:   Origin of manufacture:  Japan
Precision:  11 Integrated circuits:  Toshiba T6824S 
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

This "The Educator®" Overhead Calculator was born in Japan as plain Canon FS-5 Scientific Statistical calculator and modified by Stokes Publishing Company, Inc. based in California.

The label on the backside of the calculator sports some interesting information: "Covered by U.S. Patent No. 4,154,007". We were already aware of the US Patent Application U.S. Pat. No. 5,035,502 filed on July 30, 1991 by William T. Stokes with the title "Transparent calculator for overhead projection" describing a calculator with both the keyboard and the display made from translucent glass and plastics.

But this US Patent Application U.S. Pat. No. 4,154,007 was filed already on September 21, 1977 by Wallace P. Judd of Palo Alto, California. It described basically a standard calculator with a transmissive LC Display and an opening in the backside of the housing.

Overhead™ Calculator is a trademark of Stokes Publishing Company, Inc.

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© Joerg Woerner, February 2, 2011. No reprints without written permission.