| US D597,590 S | ||
| Self-correcting abacus | ||
| Celia Anne Stone, Leeds (United Kingdom) | ||
| Assigned to Addacus Limited, Leeds (United Kingdom) | ||
| Filed on Jun. 08, 2006, as Appl. No. 29/247,261. | ||
| Claims priority of application No. 000492681 (EM), filed on Mar. 09, 2006. | ||
| Term of patent 14 Years | ||
| LOC (9) Cl. 18 - 01 | ||
| U.S. Cl. D18—6 |
| The ornamental design for a self-correcting abacus, as shown and described. |