| Patents for B43L 21 - Blackboard or slate-cleaning devices (5,409) |
|---|
| 04/19/2006 | CN1760041A Automatic device for wiping blackboard assorted with blackboard in type of push and pull up down, and method of application |
| 04/12/2006 | EP1644203A2 Encapsulated tray, end caps, and method for making the same for a writing board |
| 04/12/2006 | CN2770996Y Electric dust-absorption chalk eraser |
| 04/12/2006 | CN2770994Y Rotary blackboard |
| 04/05/2006 | CN2769088Y Electric dust-suction blackboard eraser |
| 04/01/2006 | CA2483422A1 Wireless blackboard eraser and dust collector |
| 03/30/2006 | DE102004045074A1 Board eraser, has cloth wrapped around rollers, and brush on bottom of housing in surface-contact with cloth |
| 03/29/2006 | CN2767198Y Anti-slip blackboard eraser |
| 03/29/2006 | CN2767197Y Multifunctional environment-friendly type blackboard eraser |
| 03/29/2006 | CN2767196Y Dust remover |
| 03/22/2006 | CN2765789Y Magnetic device for writing and drawing |
| 03/22/2006 | CN2765787Y Wiping-free blackboard |
| 03/22/2006 | CN1749031A Magnetic blackboard |
| 03/15/2006 | CN2764635Y Blackboard eraser with dust collector |
| 03/15/2006 | CN2764634Y Manual dust remover for blackboard eraser |
| 03/08/2006 | CN2763080Y Blackboard eraser |
| 03/08/2006 | CN2763079Y Cover of backboard eraser |
| 03/08/2006 | CN2763078Y Electric spraying type eraser |
| 03/08/2006 | CN2763076Y Electric, rotating and strip-like blackboard |
| 03/08/2006 | CN1743186A 板擦 Eraser |
| 03/08/2006 | CN1743185A Back-erasing automatic-cleaning backboard |
| 03/01/2006 | CN2761433Y Blackboard eraser with box for collecting chalk powder |
| 03/01/2006 | CN1739979A Dust-free black board eraser |
| 02/22/2006 | CN2759808Y Environment protection black board eraser |
| 02/15/2006 | CN2758092Y Fast blackboard eraser |
| 02/15/2006 | CN1733502A Dust-absorbing brush for blackboard |
| 02/08/2006 | CN2756463Y 除尘黑板擦 Dust eraser |
| 02/08/2006 | CN2756462Y Electric dust suction chalk erazer |
| 02/08/2006 | CN2756461Y Dust suction black board |
| 02/01/2006 | CN2754904Y Multifunctional assembled health-care blackboard eraser with dust collection |
| 02/01/2006 | CN2754903Y Dust-collecting eraser |
| 02/01/2006 | CN2754902Y Dust collector of blackboard eraser |
| 02/01/2006 | CN2754901Y Blackboard eraser |
| 02/01/2006 | CN2754899Y Dust-collecting blackboard |
| 01/25/2006 | EP1618008A2 Writing assembly in combination with an eraser assembly |
| 01/25/2006 | CN2753597Y 环保黑板擦 Environmental eraser |
| 01/25/2006 | CN2753596Y Dust-absorbing blackboard eraser |
| 01/18/2006 | CN2752075Y Dust-absorbing blackboard eraser |
| 01/18/2006 | CN2752074Y Blackboard eraser |
| 01/11/2006 | CN2750936Y Full-automatic blackboard eraser |
| 01/04/2006 | CN2749700Y 蓄水式黑板擦 Water type eraser |
| 01/04/2006 | CN2749699Y Dust-proof blackboard eraser |
| 01/04/2006 | CN1234546C Dust removing method and device for vertical and horizontal plane |
| 12/28/2005 | CN2748290Y Dust absorbing blackboard eraser |
| 12/28/2005 | CN2748289Y 自动黑板擦 Automatic eraser |
| 12/28/2005 | CN2748288Y Clean blackboard eraser |
| 12/28/2005 | CN2748287Y Blackboard rapid cleaning device |
| 12/21/2005 | CN2747071Y Electric chalk-dust sucking eraser |
| 12/07/2005 | CN2744534Y 电动板擦 Electric eraser |
| 12/07/2005 | CN2744533Y Blackboard eraser with pointer function |
| 11/30/2005 | CN2743149Y Special suction eraser head for dust collector blackboard eraser |
| 11/30/2005 | CN2743148Y Environmental protection dust less blackboard eraser |
| 11/23/2005 | CN2741792Y 板擦 Eraser |
| 11/23/2005 | CN2741791Y Eraser for blackboard text |
| 11/17/2005 | US20050251942 Holder device |
| 11/16/2005 | CN2740433Y Sanitary blackboard erazer with adjustable height |
| 11/16/2005 | CN2740432Y Erazer |
| 11/16/2005 | CN2740431Y Blackboard erazer |
| 11/16/2005 | CN2740430Y Environmental protective dust collector of blackboard sponge |
| 11/16/2005 | CN2740429Y Dustproof blackboard sponge |
| 11/09/2005 | CN2739013Y Water-bag-type blackboard eraser |
| 11/09/2005 | CN1693098A Pneumatic blackboard eraser |
| 11/02/2005 | CN2737577Y Blackboard brush |
| 11/02/2005 | CN2737576Y Two-purpose self-cleaning dust-absorbing wet blackboard eraser without using electric power |
| 10/27/2005 | WO2005002391A3 Encapsulated tray, end caps, and method for making the same for a writing board |
| 10/19/2005 | CN2734514Y Electric dust collecting chalk brush |
| 10/19/2005 | CN2734513Y Blackboard eraser |
| 10/19/2005 | CN2734512Y Highly effective blackboard eraser with a rough side and a fine side |
| 10/12/2005 | CN2732501Y Electric rotating type automatic erasing board device |
| 10/12/2005 | CN2732500Y Multifunctional teaching aid |
| 10/12/2005 | CN2732495Y 自净式黑板 Self-purification blackboard |
| 10/12/2005 | CN2732494Y 电动书写黑板 Electric blackboard writing |
| 09/28/2005 | CN2728791Y Eraser with chalkbox and mirrow |
| 09/28/2005 | CN2728790Y Eraser cleaning device |
| 09/28/2005 | CN2728782Y Automatization teaching board |
| 09/27/2005 | US6948874 Apparatus for erasing and cleaning a marker board |
| 09/27/2005 | US6948210 Automated board eraser |
| 09/21/2005 | CN2726912Y Electric dust-collecting blackboard eraser |
| 09/20/2005 | US6944904 Chalkboard cleaning apparatus with a fluid reservoir |
| 09/14/2005 | CN2725039Y Dust retaining blackboard eraser |
| 09/14/2005 | CN2725038Y Improved structure of multifunction blackboard eraser |
| 09/07/2005 | CN2723221Y Full automatic blackboard |
| 08/24/2005 | CN2719603Y Circulating self-erasing dust-proof blackboard |
| 08/24/2005 | CN2719602Y Instant adhesive type magnetic plastic writing board |
| 08/23/2005 | US6932531 Writing assembly with eraser assembly |
| 08/17/2005 | CN2717718Y Dust-absorbing blackboard eraser |
| 08/17/2005 | CN2717717Y 电动黑板擦 Electric eraser |
| 08/10/2005 | CN2716024Y Double adjusting dust collection blackboard eraser without energy resource |
| 08/10/2005 | CN2716023Y Blackboard erase |
| 08/10/2005 | CN2716015Y Blackboard eraser |
| 08/03/2005 | EP1559578A2 White board eraser |
| 07/27/2005 | CN2712657Y Chalk dust-absorbing blackboard eraser |
| 07/27/2005 | CN2712656Y 自动吸粉笔灰尘的黑板擦 Automatic suction chalk dust eraser |
| 07/20/2005 | CN2710923Y Dust-sucking type eraser |
| 07/14/2005 | DE10360585A1 Vorrichtung zum Reinigen einer beschichteten Tafel aus Stahlblech Device for cleaning a coated sheet of steel plate |
| 07/13/2005 | CN2709200Y Dust collecting blackboard eraser |
| 07/13/2005 | CN2709199Y Blackboard eraser |
| 07/13/2005 | CN2709198Y Easy erasing blackboard |
| 07/13/2005 | CN2709197Y Blackboard eraser |
| 07/06/2005 | CN2707530Y Blackboard eraser |