| Patents for B43L 21 - Blackboard or slate-cleaning devices (5,409) |
|---|
| 04/09/2003 | CN2543726Y 电动黑板擦 Electric eraser |
| 04/09/2003 | CN2543725Y Dust filter box |
| 04/09/2003 | CN2543724Y Dust-remover for blackboard |
| 04/09/2003 | CN2543723Y Dust proof blackboard eraser |
| 04/09/2003 | CN2543722Y Dust free blackboard eraser |
| 04/09/2003 | CN2543721Y Automatic switch for blackboard eraser |
| 04/02/2003 | CN2542464Y Electric chalk dust absorbing eraser |
| 04/02/2003 | CN2542463Y Chalk sleeve eraser |
| 04/02/2003 | CN2542456Y New blackboard |
| 03/26/2003 | CN2541205Y Automatic dust removing eraser |
| 03/26/2003 | CN2541204Y Dustless high efficiency automatic blackboard eraser |
| 03/19/2003 | CN2540291Y Electric eraser with chalk dust absorbing device |
| 03/19/2003 | CN2540290Y Eraser with device for absorbing chalk dust |
| 03/19/2003 | CN2540289Y Eraser |
| 03/19/2003 | CN2540284Y Flexible writing board with circulation rotation device for cleaning |
| 03/12/2003 | CN2539647Y Blackboard eraser |
| 03/12/2003 | CN2539646Y Retractable blackboard eraser |
| 03/05/2003 | CN2538566Y Multifunctional means for absorbing chalk dust |
| 03/05/2003 | CN2538565Y Blackboard eraser |
| 03/05/2003 | CN2538564Y Blackboard eraser |
| 03/05/2003 | CN2538555Y Automatic wiping environment protection blackboard using chalk |
| 02/27/2003 | US20030037404 Electronic blackboard eraser |
| 02/26/2003 | EP1285782A1 A dust collecting apparatus for eraser |
| 02/20/2003 | US20030033686 Dust collecting apparatus for eraser |
| 02/12/2003 | CN2535246Y Doube-roller dust-absorbing eraser for blackboard |
| 02/12/2003 | CN2535240Y Automatic-erasing writing board |
| 02/05/2003 | CN2534036Y Environment protection dust suction blackboard eraser |
| 02/05/2003 | CN2534035Y Dust-collecting blackboard eraser |
| 02/05/2003 | CN2534034Y Blackboard eraser box holder |
| 01/29/2003 | CN2532995Y Remote-controlled electric blackboard eraser |
| 01/29/2003 | CN2532994Y Dustless blackboard eraser |
| 01/29/2003 | CN2532993Y Cleaning device for student |
| 01/29/2003 | CN2532992Y 快洁黑板擦 Fast-cleaning eraser |
| 01/22/2003 | CN2531951Y Dust-suction blackboard erasor |
| 01/22/2003 | CN2531949Y Electric driven dustless blackboard |
| 01/15/2003 | CN2530818Y Dustless blackboard erazer |
| 01/09/2003 | WO2003002358A1 Eraser selectively openable and closable apertures |
| 01/08/2003 | CN2529774Y Dust collecting eraser |
| 01/02/2003 | US20030000042 Eraser having selectively openable and closable aperatures |
| 01/01/2003 | CN2528644Y Multifunctional eraser |
| 01/01/2003 | CN2528643Y Environmental protection eraser |
| 12/25/2002 | CN2527455Y Multilayer stripable board eraser |
| 12/18/2002 | CN2526188Y Electric blackboard duster |
| 12/18/2002 | CN2526187Y Dry cleaning machine for blackboard eraser |
| 12/18/2002 | CN2526186Y Blackboard eraser |
| 12/18/2002 | CN2526185Y Multifunctional simple blackboard erazer |
| 12/11/2002 | CN2524966Y 除尘黑板擦 Dust eraser |
| 12/11/2002 | CN2524965Y New Blackboard eraser |
| 12/11/2002 | CN2524964Y New spray blackboard eraser |
| 12/11/2002 | CN2524947Y New dust suction blackboard |
| 12/11/2002 | CN2524946Y Arch face writing board |
| 12/04/2002 | CN2523618Y Vacuum cleaner |
| 12/04/2002 | CN2523617Y Dustproof erasers |
| 12/04/2002 | CN2523616Y Blackboard erasers |
| 12/04/2002 | CN2523615Y Blackboard erasers |
| 12/04/2002 | CN2523611Y Water cleaned dustless blackboard |
| 11/27/2002 | CN2522269Y Dust-proof eraser |
| 11/20/2002 | CN2521065Y Health care blackboard eraser |
| 11/20/2002 | CN2521064Y Convenient blackboard eraser |
| 11/09/2002 | CA2346602A1 A dust collect device for an eraser |
| 11/06/2002 | CN2519739Y Chalk dust cleaner |
| 11/06/2002 | CN2519738Y Dust suction type blackboard eraser |
| 10/31/2002 | WO2001051277A9 Dry erase member |
| 10/30/2002 | CN2518708Y Pollutionless health eraser |
| 10/30/2002 | CN2518707Y Eraser without chalk dust |
| 10/30/2002 | CN2518706Y Eraser without chalk dust |
| 10/30/2002 | CN2518705Y New eraser |
| 10/30/2002 | CN2518704Y Eraser |
| 10/30/2002 | CN2518698Y Automatic erasing blackboard |
| 10/23/2002 | CN2517592Y Dust collecting eraser |
| 10/23/2002 | CN2517591Y Dustless eraser |
| 10/16/2002 | CN2516362Y Environmental protection eraser with device for absorbing chalk dust |
| 10/16/2002 | CN2516361Y Eraser with device for absorbing chalk dust |
| 10/16/2002 | CN2516360Y Expansion eraser |
| 10/16/2002 | CN2516359Y Blackboard cleaning brush with chalk dust container |
| 10/09/2002 | CN2515040Y Automatic chalk dust absorption type blackboard eraser |
| 10/09/2002 | CN2515036Y 滚珠式黑板 Ball blackboard |
| 10/02/2002 | CN2513787Y Dustless blackboard erazer |
| 10/01/2002 | US6457792 Method for effecting actions over vertical surfaces |
| 09/25/2002 | CN2512622Y Magnetic drawing board capable of wiping at will |
| 09/11/2002 | CN2510313Y Blackboard eraser with automatic dust-suction structure |
| 09/11/2002 | CN2510312Y New-type blackboard brush |
| 09/11/2002 | CN2510308Y Automatic-erasing dustproof blackboard for chalk writing |
| 09/11/2002 | CN1368436A Circulating blackboard without erasing it |
| 09/04/2002 | CN2508982Y Photo sensitive electronic blackboard and its writing & erasing accessories |
| 09/04/2002 | CN2508981Y Automatic removing dust blackboard |
| 09/04/2002 | CN2508980Y Blackboard |
| 09/04/2002 | CN1367090A Dustless blackboard |
| 08/28/2002 | CN2507659Y Dust-less board for teaching |
| 08/21/2002 | CN2506456Y Dust-suction blackboard eraser |
| 08/21/2002 | CN2506455Y Dust-suction blackboard eraser |
| 08/21/2002 | CN2506452Y Circulation type closed cleaing and dust collecting blackboard |
| 08/14/2002 | CN2505298Y Automatic eraser machine |
| 08/08/2002 | US20020104180 White board wiper |
| 08/07/2002 | CN2504093Y Dust absorbing electric eraser |
| 08/07/2002 | CN2504092Y Dust absorbing blackboard character removing device |
| 08/07/2002 | CN2504091Y Extension eraser |
| 08/07/2002 | CN2504087Y Full automatic wiping dustless teaching board |
| 07/31/2002 | EP1226979A1 A dust collecting device for an eraser and an eraser provided therewith |
| 07/31/2002 | CN2502915Y Eraser with device for absorbing chalk dust |