Wheel calculator

Details Wheel calculator Wheel calculator

2005-08-09

2005-08-09

Frech, Karl D. (Department: 2876)

Registers

Calculators

Single axis

C235S077000, C235S487000

Reexamination Certificate

active

06926198

ABSTRACT:
A wheel chart having at least one rigid disk formed by a compact disk which, in addition to having a mirrored or reflective layer capable of carrying reproducible information, has legible matter on an obverse side which cooperates with a member such as a transparent rigid disk which can also bear indicia to enable calculations to be made by relative rotation of the disks.

REFERENCES:
patent: 3778766 (1973-12-01), Rapp
patent: 4680453 (1987-07-01), Pugh
patent: 4754125 (1988-06-01), Penn
patent: 5470627 (1995-11-01), Lee et al.
patent: 5678862 (1997-10-01), Hughes et al.
patent: 5875171 (1999-02-01), Albrecht et al.
patent: 6460762 (2002-10-01), Bromberg et al.

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