B43L 21 - Blackboard or slate-cleaning devices

Patents for B43L 21 - Blackboard or slate-cleaning devices (5,409)
01/2001
01/31/2001	CN2417033Y Water-washing type automatic blackboard eraser
01/24/2001	CN2415941Y 电动黑板擦 Electric eraser
01/17/2001	CN2414924Y Blackboard eraser
01/17/2001	CN2414923Y Blackboard cleaner
01/10/2001	CN2413919Y 吸尘黑板擦 Eraser dust
01/03/2001	CN2412761Y Electric chalk dust-absorbing eraser
01/03/2001	CN2412760Y Eraser purifier
01/03/2001	CN2412759Y Chalk dust absorbing eraser
12/2000
12/27/2000	CN2411906Y Blackboard eraser
12/27/2000	CN2411905Y 自洁式书写板 Self-cleaning tablet
12/27/2000	CN2411904Y Electric eraser of large magnetic demonstration writing board
12/26/2000	US6164976 Creativity center apparatus and method for use
12/20/2000	EP0786358B1 Writing board
12/20/2000	CN2411131Y Electric dust-proof eraser
12/20/2000	CN2411130Y Eraser
12/06/2000	CN2409064Y Dust-absorbing blackboard eraser
12/06/2000	CN2409063Y Dust-absorbing blackboard eraser
12/06/2000	CN2409062Y Dust-absorbing blackboard eraser
12/06/2000	CN2409060Y Self-cleaning blackboard
11/2000
11/22/2000	CN2406833Y Dust collecting blackboard eraser
11/22/2000	CN2406832Y Air purifying device for classroom
11/22/2000	CN2406831Y 磁性黑板擦 Magnetic eraser
11/16/2000	WO2000068025A1 An apparatus and a method for automatically erasing a blackboard
11/16/2000	CA2368143A1 An apparatus and a method for automatically erasing a blackboard
11/15/2000	CN2405768Y Automatic dust-collection blackboard eraser
11/15/2000	CN2405767Y Blackboard eraser
11/08/2000	CN2404718Y Electric chock-dust absorbing wiper for blackboard
11/08/2000	CN2404717Y Means for sucking and removing chock-dust
11/08/2000	CN2404716Y Chock-dust absorbing wiper for blackboard
11/08/2000	CN2404715Y Static chock-dust absorbing wiper for blackboard
11/08/2000	CN2404710Y Magnetic displaying type black-board
11/01/2000	CN2403594Y Chalk dust-absorbing eraser
11/01/2000	CN2403593Y Eraser with means for absorbing the chalk dust
11/01/2000	CN2403592Y Charging automatic absorbing chalk dust blackboard eraser
11/01/2000	CN2403591Y Electric dust-suction blackboard eraser
10/2000
10/25/2000	CN2402500Y Dust-suction blackboard eraser
10/25/2000	CN1057733C Writing board device
10/18/2000	CN2401379Y Blackboard eraser without pollution
10/18/2000	CN2401378Y Electrostatic adsorbed writing board
10/18/2000	CN2401377Y Dust remover for blackboard eraser
10/11/2000	CN2400292Y Dust-proof eraser
10/04/2000	CN2399228Y Dust removing erazer
09/2000
09/27/2000	CN2398107Y Multifunction eraser
09/20/2000	CN2396984Y Telescopic all plastic blackboard eraser
09/13/2000	CN2395905Y Electric dust-absorbing blackboard erazer
09/13/2000	CN2395904Y Remote-controlled electric lift-right reciprocating dust-free blackboard erazer
09/13/2000	CN2395903Y Multifunctional blackboard erazer
09/06/2000	CN2394797Y Closed dust collection blackboard erazor
09/06/2000	CN2394796Y Dust suction blackboard erazor
09/06/2000	CN2394795Y Dust-free blackboard erazor
08/2000
08/30/2000	CN2393730Y Electric dust collecting eraser
08/30/2000	CN2393729Y 电动黑板擦 Electric eraser
08/16/2000	CN2391751Y Remote control and chalk-dust suction type wiper mechanism for blackboard
08/16/2000	CN2391750Y Electric suction wiper for blackboard
08/10/2000	WO2000046042A1 Creativity center apparatus and method of use
08/09/2000	CN2390764Y Blackboard eraser
08/02/2000	CN2389792Y 无尘黑板擦 Clean eraser
07/2000
07/26/2000	CN2389074Y Low presure dust-removing eraser for blackboard
07/19/2000	CN2388056Y Electrostatic dust-removing blackboard cleaner
07/19/2000	CN2388055Y Full-automatic blackboard-cleaning machine
07/19/2000	CN2388054Y New eraser
07/19/2000	CN2388053Y Dustless eraser
07/19/2000	CN2388052Y 自动无尘黑板 Automatically clean the blackboard
07/19/2000	CN2388051Y Dust-suction eraser
07/13/2000	WO1999053466A3 An apparatus and a method for automatically erasing a blackboard
07/12/2000	CN2386972Y Electric dusting eraser
07/12/2000	CN2386968Y Teaching blackboard able to be automatically cleaned
07/05/2000	CN2385904Y Electric dustless blackboard
06/2000
06/28/2000	CN2384791Y Automatic dust-collecting blackboard eraser
06/28/2000	CN2384790Y Electric dust-collecting blackboard eraser
06/28/2000	CN2384789Y Electroless self-dust-collecting brush
06/21/2000	CN2383703Y Remote-controlled dust-absorbing blackboard erazer device
06/21/2000	CN2383702Y Blackboard erazer
06/21/2000	CN2383701Y Dust absorbing blackboard erazer
06/21/2000	CN2383700Y Rolling blackboard erazer
06/14/2000	CN2382574Y Dust sucking blackboard eraser
06/14/2000	CN2382573Y Chalk-dust filtering blackboard eraser
06/13/2000	US6073297 Automatic erasing device for erasing chalk marks on a writing board
06/07/2000	CN2381509Y Automatic electrostatic dust collector for blackboard
06/07/2000	CN2381506Y Magnetic dust collecting blackboard and eraser thereof
05/2000
05/31/2000	CN2380407Y Dust-collecting blackboard eraser
05/31/2000	CN2380406Y Remote-controlled electric blackboard eraser
05/24/2000	CN2379327Y 电动黑板擦 Electric eraser
05/24/2000	CN2379326Y Electric and dust-absorbing blackboard eraser
05/24/2000	CN2379325Y Blackboard eraser
05/17/2000	CN2378212Y Dustproof chalk eraser
05/17/2000	CN2378211Y Dust-collecing electric blackboard eraser
05/17/2000	CN2378210Y Electric absorbing chalk dust eraser
05/10/2000	CN2377106Y Hand chalk dust-absorbing and -less blackboard eraser
05/10/2000	CN2377105Y Automatic blackboard erasing machine
05/10/2000	CN2377102Y Electric chalk dust-less teaching board
05/03/2000	CN2376387Y Dust-collecting blackboard eraser
05/02/2000	US6056468 Eraser for whiteboard marker
04/2000
04/26/2000	CN2375482Y Eraser capable of collecting chalk dust
04/26/2000	CN2375481Y Eraser capable of collecting chalk dust
04/26/2000	CN2375480Y Chalk dust collecting eraser
04/26/2000	CN2375479Y Automatic eraser
04/19/2000	CN2374367Y Multipurpose eraser
04/19/2000	CN2374366Y Automatic dust sucking eraser
04/19/2000	CN2374365Y Hygienic dust sucking eraser

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