Educational apparatus for learning math
The broken lines illustrating text in
Claims
The ornamental design for an educational apparatus for learning math, as shown and described.
| 378866 | March 1888 | Clark et al. |
| 1099009 | June 1914 | Bennett |
| 1144487 | June 1915 | McGinley |
| 1441323 | January 1923 | Barber |
| 2228554 | January 1941 | Brown |
| 2646631 | July 1953 | Lazar |
| 2654164 | October 1953 | Seidenberg |
| 2655737 | October 1953 | Dero |
| D181754 | December 1957 | Schott |
| 2872742 | February 1959 | Schott |
| 3076272 | February 1963 | Schott |
| 3508348 | April 1970 | Harada |
| 3633287 | January 1972 | Squires |
| 3688418 | September 1972 | Wilson |
| 3731401 | May 1973 | Kojima |
| D248332 | June 27, 1978 | Bailey |
| 4295832 | October 20, 1981 | Karell |
| 4812124 | March 14, 1989 | Colodner |
| 4884973 | December 5, 1989 | Pak |
| 4993952 | February 19, 1991 | Yeh |
| D674441 | January 15, 2013 | Rule |
| 20070166673 | July 19, 2007 | Frieman |
| 20080280273 | November 13, 2008 | Lee |
| 20120028229 | February 2, 2012 | Harte |
| 20120251986 | October 4, 2012 | Silas-Martin |
| 20130052617 | February 28, 2013 | Harte |
| 20130236864 | September 12, 2013 | Harte |
Type: Grant
Filed: Apr 3, 2015
Date of Patent: Feb 26, 2019
Assignee: LEARNTOOLS INC. (Westlake, OH)
Inventor: Raymond J. Herrmann (Westlake, OH)
Primary Examiner: Ian Simmons
Assistant Examiner: Lauren D McVey
Application Number: 29/522,910