Self-correcting abacus

Details Self-correcting abacus Self-correcting abacus

2006-06-08

2009-08-04

Veynar, Caron (Department: 2913)

Printing and office machinery

Typewriter or calculator

Calculator

Design Patent

active

D0597590

CLAIM:
The ornamental design for a self-correcting abacus, as shown and described.

REFERENCES:
patent: 2252678 (1941-08-01), McC. Beary
patent: 2494497 (1950-01-01), Trapnell
patent: D165550 (1951-12-01), Prouty
patent: 3321133 (1967-05-01), Okuda
patent: D249090 (1978-08-01), LaCelle
patent: 4629431 (1986-12-01), Sanders
patent: D309165 (1990-07-01), Kaplan et al.
patent: 5134692 (1992-07-01), Hiromori
patent: 5205747 (1993-04-01), Tan
patent: 6712614 (2004-03-01), Henderson
patent: D513762 (2006-01-01), Young
patent: 2003/0148250 (2003-08-01), Walker et al.

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