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US 3,973,113 AGranted
Electronic calculator for feet-inch-fraction numerics
OwnerAlan B. Goldsamtinventor
Life of this patent
Estimating the term…
Abstract
An apparatus is disclosed for automatically adding, subtracting, multiplying and dividing feet, inches and fractions of an inch and for the recordation of the results of said arithmetic functions on a visual display. The apparatus also automatically and directly converts feet, inches and fractions of an inch into decimal equivalents and into the metric system of measurement and, similarly, converts numbers in decimal numeric and in metric measurement automatically and directly into feet, inches and fractions of an inch.
Claims8
A computing apparatus contained within a housing, comprising:
- a display console consisting of three separate and distinct displays to record the results of specified computations;
- a first keyboard having a plurality of character keys representing the digits 0 through 9;
- primary function keys representing the arithmetic functions of addition, subtraction, multiplication and division;
- a key representing an "equals" function;
- a key representing a decimal point;
- a key representing a "clear all" function;
- a key representing a "clear last entry" function;
- a key representing a percent function;
- a key representing a square root function;
- a second keyboard having a plurality of character keys with the 12 character keys representing the digits 1 through 12 representing, respectively, 1 through 12 inches;
- a third keyboard having a plurality of character keys with the character keys representing the identified fractions of 1/8, 1/4, 3/8, 1/2, 5/8, 3/4 and 7/8;
- an array of switches, including an "on/off" switch, a constant switch, a decimal selector switch, an operation selector switch;
- conversion keys, including a feet-to-decimal conversion key, a decimal-to-feet conversion key, a feet-to-meters conversion key, a meters-to-feet conversion key, an inches-to-centimeters conversion key, a centimeters-to-inches conversion key;
- memory utilization means, including a plurality of keys representing the "memory" functions of entering positive numerics into memory, entering negative numerics into memory, recalling numerics entered into memory, clearing numerics entered into memory;
- an indicator light to indicate when numerics have been entered into a memory;
- an indicator light to indicate when numerics have been entered into another memory;
- and
- a power source for driving the computing apparatus.
15 more elements
Dependencies are inferred from the claim text.