Title:
Mathematical aid
United States Patent D317787


Inventors:
Davidson, William A. (73 Joel Terrace, Perth, AU)
Davidson, Silvia (73 Joel Terrace, Perth, AU)
Charters, John D. (280 Great Eastern Highway, Midland, AU)
Application Number:
07/482749
Publication Date:
06/25/1991
Filing Date:
02/21/1990
Primary Class:
Field of Search:
D19/59, D19/60, D19/61, D19/62, D19/63, D19/64, 434/211, 434/213, 434/214, 434/215, 434/216, 434/203, D21/65, D11/3, D11/4, D11/6
View Patent Images:
US Patent References:
D265666Educational toy rattleAugust, 1982Nakao et al.D19/59
D241856N/AOctober, 1976WilliamsD19/59
D231738N/AJune, 1974Brass434/214
D217770N/AJune, 1970GoldbergD19/59



Primary Examiner:
Burke, Wallace R.
Assistant Examiner:
Schmidt P.
Attorney, Agent or Firm:
Harness, Dickey & Pierce
Claims:
1. The ornamental design of a mathematical aid, as shown and described.

Description:

FIG. 1 is a top perspective view of a mathematical aid showing our new design; and

FIG. 2 is a bottom plan view thereof.