United States Patent 4,158,285
Interactive Wristwatch Calculator
Jun. 19, 1979
Inventors:
- Edward A. Heinsen, Cupertino, Calif.
- Andre F. Marion, Palo Alto, Calif.
- Thomas E. Osborne, San Francisco, Calif.
Assignee: Hewlett-Packard Company, Palo Alto, Calif.
Appl. No.: 656,751
Filed: Feb. 9, 1976
Abstract:
An apparatus is disclosed comprising an electronic wristwatch and a
multifunction electronic calculator in a single wrist mountable case having a
common display and keyboard. The watch portion of the watch/calculator
includes time of day, calendar, stopwatch and alarm functions. Each of these
functions can be controlled from the keyboard on the watch/calculator. The
electronic calculator portion of the watch/calculator performs the four
standard arithmetic functions: add, subtract, multiply and divide; and has an
extra storage register. The calculator portion can perform calculations with
scalar quantities entered via the keyboard or stored in the calculator as well
as calculations with time interval and real time data from the watch portion.
During the time that calculations are not being performed the calculator goes
into a sleep or inactive mode in order to minimize the amount of battery
power used by the watch/calculator.
image of first page of this patent is
available (approximately 50 Kbytes).
It is a TIFF class F file at 300 DPI resolution using ITU-T Group 4 Facsimile
(T.6) coding.
Eric's notes:
This patent contains detailed technical information concerning the circuitry
and instruction set used in the HP-01, as well as the microcode ROM
listings of a pre-release version.
Back to the HP Calculator Patents page
Back to my home page
Last updated July 17, 1995
Copyright 1995 Eric Smith
eric@brouhaha.com
This page has been hit
times since 9/15/95.