Keyless electronic calculating pen

Details Keyless electronic calculating pen Keyless electronic calculating pen

1977-08-08

1979-02-20

Malzahn, David H.

Boots, shoes, and leggings

3401463SY, 364709, G06F 302, G06F 738

Patent

active

041410734

ABSTRACT:
Keyless Electronic Calculating Pen comprises a portable combination of a pen and an electronic calculator. Signals generated by the pen tip through designated strokes of numerals and calculating symbols upon writing on any surface of any writing medium are input directly to the calculator to perform calculating and displaying functions. The written record can be kept for checking and future reference.

REFERENCES:
patent: 3617708 (1971-11-01), Bongiovanni
patent: 3937939 (1976-02-01), Frenkel
patent: 4007364 (1977-02-01), Ojima et al.
patent: 4029915 (1977-06-01), Ojima
patent: 4070649 (1978-01-01), Wright, Jr. et al.

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