Title:
Mathematical educational device
United States Patent D322812


Inventors:
Harwin, Joan D. (Virginia Beach, VA)
Application Number:
07/435796
Publication Date:
12/31/1991
Filing Date:
11/13/1989
Assignee:
Harwin, Alec S. (Virginia Beach, VA)
Harwin, Taylor M. (Virginia Beach, VA)
Primary Class:
Other Classes:
D19/64
Field of Search:
D19/59, D19/60, D19/61, D19/62, D19/63, D19/64, D10/40, D18/7, D21/13, D14/114, D14/100, D14/124, D14/137, 434/224, 434/227, 434/308, 434/195, 434/335, 434/322, 434/323, 434/324, 434/228, 434/365
View Patent Images:
US Patent References:
D310094Electronic calculatorAugust, 1990NoguchiD18/7
D290815TimerJuly, 1987FenneD10/40
D269356Desk top electronic calculatorJune, 1983Yoshioka et al.D18/7
D283403Electronic timerApril, 1982ChanD10/40
D256028Case for an electronic learning aid, game or similar apparatusJuly, 1980Lawrence et al.D19/60



Primary Examiner:
Burke, Wallace R.
Assistant Examiner:
Schmidt, Pamela
Attorney, Agent or Firm:
Oldham & Oldham Company
Claims:
1. The ornamental design for a mathematical educational device, as shown anddescribed.

Description:

FIG. 1 is a perspective view of the mathematical educational device showing my new design, and having the lid to a storage compartment associated therewith shown in a semi-open position;

FIG. 2 is a rear elevational view thereof with the lid shown in the semi-open position;

FIG. 3 is a top plan view thereof with the lid shown in the closed position;

FIG. 4 is a right side elevational view thereof with the lid shown in the semi-open position with it being understood that the left side elevational view will be a mirror image thereof, and;

FIG. 5 is a front elevational view thereof with the lid shown in the semi-open position.