| Patents for B43L 21 - Blackboard or slate-cleaning devices (5,409) |
|---|
| 07/06/2005 | CN2707529Y Multifunctional blackboard eraser |
| 07/06/2005 | CN2707528Y Dust cleaner of blackboard eraser |
| 07/06/2005 | CN2707527Y Dust-absorbing blackboard eraser |
| 07/06/2005 | CN2707526Y Dust excluding hood of blackboard eraser |
| 06/29/2005 | CN2706335Y Environmental protection automatic blackboard eraser |
| 06/22/2005 | EP1543993A1 Device for cleaning a coated steal sheet board |
| 06/22/2005 | CN2705317Y Learning type blackboard eraser |
| 06/15/2005 | CN2704486Y Blackboard eraser |
| 06/15/2005 | CN2704485Y Dustproof blackboard eraser |
| 06/15/2005 | CN1626362A Blackboard brush capable of restraining dust |
| 06/09/2005 | WO2004096577A3 Writing assembly in combination with eraser assembly |
| 06/08/2005 | CN2703658Y Dustfree magnetic black board and blackboard eraser and pen matched with same |
| 06/01/2005 | CN2702866Y Automatic absorbing dust blackboard eraser |
| 06/01/2005 | CN1621244A Electric blackboard brush with blocked magnets |
| 05/25/2005 | CN2701652Y Dust-free blackboard eraser |
| 05/25/2005 | CN1618630A Dustless blackboard |
| 05/24/2005 | US6895627 Blackboard eraser |
| 05/18/2005 | CN2700129Y Electric dust collecting blackboard eraser |
| 05/18/2005 | CN2700128Y Novel blackboard eraser |
| 05/18/2005 | CN2700127Y Self chalk dust suction black-board eraser |
| 05/11/2005 | CN2698604Y Novel blackboard eraser |
| 05/11/2005 | CN2698603Y Dustproof roller case type blackboard eraser |
| 05/11/2005 | CN2698602Y Environmental protection blackboard eraser |
| 05/11/2005 | CN2698601Y Liquid blackboard eraser |
| 05/11/2005 | CN1613396A Gloves for teachers |
| 05/04/2005 | CN2696862Y Environment protective blackboard eraser |
| 05/04/2005 | CN2696861Y Blackboard eraser |
| 04/27/2005 | CN2695252Y Dust-collecting eraser |
| 04/27/2005 | CN2695251Y Dust-proof blackboard eraser |
| 04/27/2005 | CN2695250Y Automatic rotation type dust-proof blackboard eraser |
| 04/27/2005 | CN2695249Y Blackboard eraser with chalk box |
| 04/27/2005 | CN2695245Y Dust-proof blackboard |
| 04/27/2005 | CN2695244Y Self-cleaning type electric blackboard |
| 04/20/2005 | CN2693492Y Clean teaching aid |
| 04/20/2005 | CN1197718C 电动黑板 Electric blackboard |
| 04/13/2005 | CN2691890Y Environmental protection blackboard eraser |
| 04/13/2005 | CN2691883Y Teaching blackboard writing device |
| 04/13/2005 | CN2691882Y Multifunction blackboard |
| 04/06/2005 | CN2690174Y Novel multifunction teaching tool |
| 03/31/2005 | WO2004045782A3 An electromotive chalk eraser |
| 03/30/2005 | CN2688512Y Structural improvement of blackboard eraser machine |
| 03/30/2005 | CN2688511Y Dust-proof blackboard eraser |
| 03/30/2005 | CN2688510Y Simple dustproof blackboard eraser |
| 03/30/2005 | CN2688509Y Water blackboard eraser |
| 03/23/2005 | CN2686866Y Dust-free blackboard eraser |
| 03/23/2005 | CN1597340A Magnetic electronic blackboard display system |
| 03/23/2005 | CN1193901C Blackboard eraser with finger-pressed dust collector and its usage method |
| 03/09/2005 | CN2683406Y Novel dust-absorbing blackboard eraser |
| 03/09/2005 | CN2683405Y 多功能板擦 Multifunction eraser |
| 03/02/2005 | CN2681916Y 电动黑板擦 Electric eraser |
| 03/02/2005 | CN2681915Y Electric dust collecting blackboard eraser |
| 02/23/2005 | CN2680476Y Blackboard eraser with chalk |
| 02/23/2005 | CN2680475Y Blackboard eraser |
| 02/23/2005 | CN2680471Y Chalk ash free blackboard |
| 02/23/2005 | CN2680470Y Dust-suction type black/white board |
| 02/09/2005 | CN2677194Y Eraser |
| 02/09/2005 | CN2677193Y Eraser |
| 02/09/2005 | CN2677192Y Environmental protecion eraser |
| 02/09/2005 | CN2677191Y Eraser |
| 02/02/2005 | EP1181156A4 An apparatus and a method for automatically erasing a blackboard |
| 02/02/2005 | CN2675420Y Voltage stabilizing blackboard eraser with double dust collection function |
| 02/02/2005 | CN2675416Y Dustless blackboard |
| 01/26/2005 | CN2673673Y Blackboard eraser capable of collecting dust |
| 01/26/2005 | CN2673672Y Automatic dust collection blackboard eraser |
| 01/26/2005 | CN2673671Y Blackboard eraser |
| 01/26/2005 | CN2673670Y Dust collection blackboard eraser |
| 01/26/2005 | CN2673665Y Automatic blackboard erasing device |
| 01/20/2005 | US20050014125 Encapsulated tray, end caps, and method for making the same for a writing board |
| 01/19/2005 | CN2671821Y Automatic dust suction blackboard brush |
| 01/19/2005 | CN2671820Y 吸尘黑板擦 Eraser dust |
| 01/19/2005 | CN2671819Y Multifunction blackboard eraser dust remover |
| 01/13/2005 | WO2005002391A2 Encapsulated tray, end caps, and method for making the same for a writing board |
| 01/12/2005 | CN2670136Y Automatic dust suction blackboard eraser |
| 01/12/2005 | CN2670135Y Easily changing blackboard eraser |
| 01/12/2005 | CN2670131Y 环保黑板 Green blackboard |
| 01/11/2005 | CA2326490C Method for effecting actions over vertical surfaces |
| 01/05/2005 | CN2668410Y Dual-side blackboard eraser |
| 12/29/2004 | CN2666691Y Blackboard eraser with means for absorbing the chalk dust |
| 12/29/2004 | CN2666685Y Multifunction blackboard |
| 12/15/2004 | CN2663165Y Dustless blackboard brush complete equipment |
| 12/15/2004 | CN1554535A Dustless noreflection blackboard |
| 12/08/2004 | CN2661457Y Folding blackboard eraser |
| 12/08/2004 | CN2661448Y Blackboard with automatic eraser |
| 12/01/2004 | CN2659704Y Dust-proof eraser |
| 12/01/2004 | CN2659703Y Eraser |
| 12/01/2004 | CN2659698Y Rolling soft face blackboard |
| 11/25/2004 | DE202004014482U1 Blackboard wiper has cleaning cloth band which is driven over set of brushes to remove and trap dust in housing |
| 11/17/2004 | CN2656157Y Double-faced blackboard eraser |
| 11/17/2004 | CN2656156Y Double-faced blackboard eraser |
| 11/17/2004 | CN2656155Y Blackboard eraser |
| 11/11/2004 | WO2004096577A2 Writing assembly in combination with eraser assembly |
| 11/11/2004 | CA2521755A1 Writing assembly in combination with eraser assembly |
| 11/10/2004 | CN2654373Y Blackboard eraser |
| 11/10/2004 | CN2654372Y Back air exhausting high efficiency ash absorb blackboard eraser |
| 11/10/2004 | CN1544255A Dedusting method and device for vertical and horizontal plane |
| 11/03/2004 | CN2652676Y Blackboard eraser |
| 11/03/2004 | CN2652675Y Novel combined blackboard eraser |
| 10/28/2004 | US20040213627 Writing assembly with eraser assembly |
| 10/27/2004 | CN2651007Y Dustproof eraser |
| 10/27/2004 | CN2651006Y Dustproof device of teaching board |