Combined counting board and abacus

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Description

FIG. 1 is a top view of the combined counting board and abacus showing my new design, the bottom view being substantially identical thereto;

FIG. 2 is a side view of the combined counting board and abacus shown in FIG. 1, the opposite side being substantially identical thereto; and,

FIG. 3 is an end view of the combined counting board and abacus shown in FIG. 1, the opposite end being substantially identical thereto.

Referenced Cited
U.S. Patent Documents
D181754 December 1957 Schott
2228554 January 1941 Brown
2872742 February 1959 Schott
3076272 February 1963 Schott
3455034 July 1969 Schott
3633287 January 1972 Squires et al.
3688418 September 1972 Wilson
Foreign Patent Documents
11645 August 1898 GBX
732266 June 1955 GBX
Other references
  • Popular Science; How to use an Abacus by W.D. Loy; pp. 86-90, Aug. 1948.
Patent History
Patent number: D433055
Type: Grant
Filed: Jan 13, 2000
Date of Patent: Oct 31, 2000
Inventor: Philip Hanthorn (Vallejo, CA)
Primary Examiner: Caron D. Veynar
Application Number: 0/116,965
Classifications
Current U.S. Class: Calculator (3) (D18/6)
International Classification: 1801;