Fred Douglas Alexander

US Patent:

47440449, May 10, 1988

Filed:

Jun 20, 1986

Appl. No.:

6/876488

Inventors:

Howard H. Stover - Pasadena CA
Kenneth E. Alexander - Villa Park CA
Fred P. Alexander - Stateline NV

Assignee:

Electronic Teacher's Aids, Inc. - Orange CA

International Classification:

G06F 1100
G06F 738

US Classification:

364737

Abstract:

The specification discloses a hand-held calculator particularly adapted for dimensional or measurement calculations. The calculator includes keys for indicating a different dimension system (e. g. feet, yards, meters) associated with each number inputted, enabling calculations to be performed on numbers from mixed dimension systems. All inputted measurements are converted to decimal feet internally to simplify calculations and simplify conversion structure and routines. Preferably, a dimension power (e. g. square or cubic) can also be associated with each input number as necessary; and the calculator calculates and displays the proper dimension power resulting from any calculation. Further preferably, the calculator includes a keyboard enabling lumber dimensions to be easily inputted for board feet calculations.