Disclosed is an electronic calculator having a data entry unit for inputting numeric data, expressions
such as parentheses and hierarchal mathematical commands, an arithmetic unit for performing
arithmetic operations on the numeric data, a memory for storing the numeric data and associated
hierarchal mathematical commands inputted via the data entry unit and logic circuitry for enabling
the arithmetic unit to perform arithmetic operations on numeric data inputted via the data entry unit
within a pair of parentheses, the logic circuitry enabling the arithmetic unit to perform a higher order
hierarchal mathematical command before a lower order hierarchal command even though the
higher order command is received after the lower order hierarchal mathematical command.
The following patents are not listed on the calculator, which means that they may not include claims
which apply to the TI-89 and TI-92 Plus. However, it is good practice to mark the product with all
relevant patents, because this aids in proving willful infringement during litigation, with its attendant
treble damages.
4,521,868 Electronic data processing apparatus with equation operating system having
improved exponentiation operators
[possibly related to 89/92+/V200's entry line and numeric solver]
Inventor(s): Caldwell; David; Ferrio; Linda J.; Hunter; Arthur C.
Issued/Filed Dates: June 4, 1985 / February 29, 1984
The equation operating system is an improved data and command entry format together with a
compatible operation system for use with electronic data processing apparatuses, most particularly
with scientific calculators which provide an alphanumeric display of entered equations. This
invention provides a different set of commands and displayed characters for performing
exponentiation. An up arrow together with a down arrow serve to define the expression of the
exponent. The numeric data stored in a numeric display register upon implementation of the
exponentiation is raised to the power of the expression between the up arrow and the down
arrow. This invention also includes an integral power exponentiation command which enables easy
entry of single digit positive integral exponents, thereby eliminating the need for a completing
command.
4,823,311 Calculator keyboard with user definable function keys and with programmably
alterable interactive labels for certain function keys
[TI-95 keyboard, but also applies to an extent to 89/92+/V200]
Inventor(s): Hunter; Arthur C.; Ferrio; Linda J.
Issued/Filed Dates: 18 April 1989 / May 30, 1986
Calculator having a keyboard in which one or more keys have labels created by a display and
subject to changing interactively as the user desires. Typically, advanced scientific-programmable
calculators may have too many functions to be adequately included on the keys of the keyboard
associated therewith. In such calculators, certain functions require a plurality of keys to be actuated
in order to be performed. Thus, such keyboards tend to be cluttered an confusing to the user. Thus,
a keyboard is proposed having a small number of keys labeled with different functional labels as the
user proceeds through a menu or tree structure containing all the desired functions. Keys in a
certain group of keys on the keyboard are thereby subject to redefinition or relabeling so as to
provide a variety of functions.
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