United States Patent 4,035,627
Scientific Calculator
July 12, 1977
Inventors:
- Peter D. Dickinson, Monte Sereno, Calif.
- Thomas E. Osborne, San Francisco, Calif.
- France Rode, Los Altos, Calif.
- Allen J. Baum, Los Altos, Calif.
Assignee: Hewlett-Packard Company, Palo Alto, Calif.
Appl. No.: 566,142
Filed: Apr. 8, 1975
Abstract:
A battery powered, hand-held calculator for performing arithmetic,
triganometric (sic) and logarithmic functions and displaying the results
thereof is provided with a clock mode which performs the functions of a
clock and displays real time or the function of a stopwatch and stores and
displays the times at which recorded events have taken place.
33 Claims, 4 Drawing Figures
An image of first page of this patent is
available (approximately 37 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 describes the stopwatch function of the HP-45. HP didn't include
the stopwatch as a supported feature of the HP-45 product, but they did build
a similar feature into the HP-55.
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Last updated July 17, 1995
Copyright 1995 Eric Smith
eric@brouhaha.com
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