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. 19, 1991
Filed:
Jan. 31, 1990
Gabe L Eisenstein, Corvallis, OR (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A calculator programmed for displaying in textbook format a mathematical expression as it is entered. This format is the way the expression would appear if presented in a textbook or if written with pencil and paper. As a key is pressed, the associated object, such as an alpha character or mathematical symbol, appears on the display screen in textbook format. A cursor is provided which responds to currently entered objects for indicating where the next object to be entered will be displayed. In displaying objects, the calculator is also context sensitive. It responds to currently entered objects by controlling the display of the next object to maintain the textbook format of the expression. Other features include syntax checking of the mathematical expression as its objects are being entered, and implicit entering and displaying of objects in response to entry of a predetermined pattern of objects.