Digital abacus

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Description

FIG. 1 is a top, front perspective view of a digital abacus showing our new design;

FIG. 2 is a top plan view of the digital abacus shown in FIG. 1, the bottom view being substantially identical thereto;

FIG. 3 is a side view of the digital abacus shown in FIG. 1, the opposite side being substantially identical thereto; and,

FIG. 4 is an end view of the digital abacus shown in FIG. 1, drawn on an enlarged scale, the opposite side being substantially identical thereto.

Referenced Cited
U.S. Patent Documents
D181754 December 1957 Schott
D198847 August 1964 Mathison
D215004 August 1969 Oota
D282669 February 18, 1986 Conlee, Jr.
D284975 August 5, 1986 Kwok
3731401 May 1973 Kojima
4812124 March 14, 1989 Colodner et al.
5134692 July 28, 1992 Hiromori
Patent History
Patent number: D399522
Type: Grant
Filed: Nov 26, 1996
Date of Patent: Oct 13, 1998
Inventors: William S. Nye (Seattle, WA), William M. Pease (Seattle, WA)
Primary Examiner: Caron D. Veynar
Attorneys: Miller Nash Wiener Hager & Carlsen, Miller Nash Wiener Hager & Carlsen
Application Number: 0/62,820
Classifications
Current U.S. Class: Calculator (3) (D18/6)
International Classification: 1801;