Electronic calculator

Details Electronic calculator Electronic calculator

1979-08-30

1981-06-09

Smith, Jerry

Boots, shoes, and leggings

364705, 364710, 368 10, G06F 302, G06F 1502, G04B 1930

Patent

active

042728266

ABSTRACT:
An indirect entry calculator having a digit section and a function section connected in an X-Y matrix and not more than three input keys including a digit key, a function key and an intermediate key. The digit section displays numerical indicia which is arrayed along only one of the axes of the matrix, while the indicia in the function section is arrayed along both axes. The digit key is employed to select the individual digits, and each successive digit is then entered in the calculator logic by means of the function key. Conversely, the functions are selected by the function key and are entered by the digit key. The intermediate key serves both to skip particular digits and functions and to step the matrix in the reverse direction. In some embodiments the calculator is additionally provided with a time-keeping function and may be used both as a calculator and as a wrist-watch or similar timepiece.

REFERENCES:
patent: 3852952 (1974-12-01), Vittoz et al.
patent: 3892958 (1975-07-01), Tung
patent: 3928960 (1975-12-01), Reese
patent: 3955355 (1976-05-01), Luce
patent: 4109315 (1978-08-01), Pan
patent: 4120036 (1978-10-01), Maeda et al.
patent: 4120040 (1978-10-01), Aihara
patent: 4152768 (1979-05-01), Kuriya

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