The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 22, 1977
Filed:
Apr. 08, 1975
Applicant:
Inventors:
Peter D Dickinson, Monte Sereno, CA (US);
Thomas E Osborne, San Francisco, CA (US);
France Rode, Los Altos, CA (US);
Allen J Baum, Los Altos, CA (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
364715 ;
Abstract
A battery-powered hand-held calculator for performing arithmetic, trigonometric, and logarithmic functions and displaying the results thereof is provided with the capability of automatically storing the last displayed number in an auxiliary storage register whenever the next succeeding function to be performed would destroy that number. That number may be recalled from the auxiliary storage register by simply depressing a prefix key and a Last-X function key.