| Patents for B43L 21 - Blackboard or slate-cleaning devices (5,409) |
|---|
| 10/24/2001 | CN2455485Y Dust collector |
| 10/24/2001 | CN1318475A Cleaning dust-exhausting black-board eraser |
| 10/17/2001 | CN2454145Y Novel blackboard |
| 10/10/2001 | CN2452758Y Roller type electric eraser |
| 10/10/2001 | CN2452757Y Chalk dust collector of black board eraser |
| 10/10/2001 | CN2452756Y Roll-like black-board eraser able to collect chalk-dust |
| 10/10/2001 | CN2452755Y Multi-functional black board eraser |
| 10/10/2001 | CN1316341A Self-erasable electric blackboard |
| 10/03/2001 | CN2451354Y Netless type electric dust-sucking blackboard eraser |
| 10/03/2001 | CN2451353Y Teacher's pointer and blackboard erazer combination |
| 10/03/2001 | CN2451352Y Blackboard erazer |
| 09/27/2001 | US20010024720 Fluoropolymers or cellulose acetates |
| 09/26/2001 | CN2449939Y Environmentally friendly blackboard eraser |
| 09/19/2001 | EP1134032A1 Surface treating device |
| 09/19/2001 | CN2448583Y Electric chalk powder sucker for blackboard |
| 09/19/2001 | CN2448582Y Powder suction blackboard eraser |
| 09/19/2001 | CN2448581Y Electricity charging type electrostatic suction blackboard eraser |
| 09/19/2001 | CN2448580Y Powder suction blackboard eraser |
| 09/19/2001 | CN2448579Y Dust free floor cleaner |
| 09/19/2001 | CN2448578Y Electric dust free blackboard erasing machine |
| 09/19/2001 | CN2448568Y Multi-function blackboard for teaching |
| 09/12/2001 | CN2447189Y Board for scientific research and teaching |
| 09/12/2001 | CN1312172A 防尘板擦 Eraser dust |
| 09/05/2001 | CN2445940Y Electric guiding negtive pressure dusting eraser |
| 09/05/2001 | CN2445939Y Electric dust collecting eraser |
| 09/05/2001 | CN2445938Y Dual-purpose automatic blackboard eraser able to sectionally wip and remote control fast dustless noiseless wip |
| 08/29/2001 | CN2444784Y Blackboard eraser |
| 08/29/2001 | CN2444781Y Blackboard with automatic cleaning device |
| 08/22/2001 | CN2443858Y Automatic blackboard erasing machine |
| 08/22/2001 | CN2443857Y Magnet blackboard eraser |
| 08/15/2001 | CN2442850Y Automatic blackboard eraser |
| 08/08/2001 | CN2441654Y Blackboard eraser with dismantling rule rod |
| 07/31/2001 | US6266841 Automatic erasing device for erasing chalk marks on a writing board by water |
| 07/19/2001 | WO2001051277A1 Dry erase member |
| 07/18/2001 | CN1303781A Automatic blackboard eraser |
| 07/11/2001 | CN2438593Y Universal dust-cleaning blackboard eraser |
| 07/11/2001 | CN2438592Y Active charging dust-cleaning blackboard eraser |
| 07/04/2001 | CN2437504Y Chalk dust absorbing blackboard eraser |
| 07/04/2001 | CN2437503Y High-voltage electrostatic chalk dust absorbing blackboard eraser |
| 07/04/2001 | CN2437500Y Chalk dust concealed environment protection blackboard |
| 06/27/2001 | CN2436328Y Electric chalk powder sucking blackboard eraser |
| 06/20/2001 | CN2435248Y Multi-functional electric chalk dust absorbing eraser |
| 06/20/2001 | CN2435247Y Chalk dust absorbing eraser |
| 06/13/2001 | CN2434151Y Dust-proof eraser |
| 06/13/2001 | CN2434150Y Portable dustless eraser |
| 06/13/2001 | CN2434149Y Belt wheel eraser |
| 06/13/2001 | CN2434148Y Novel eraser device |
| 06/13/2001 | CN1298804A Curtain-type blackboard of plastic film |
| 06/06/2001 | CN2433092Y Eraser with chalk dust collecting |
| 05/30/2001 | CN2432056Y Dustless blackboard eraser |
| 05/30/2001 | CN2432055Y Dust-absorption blackboard eraser |
| 05/30/2001 | CN2432054Y Hand-holding board with dust-absorbing and washing functions |
| 05/23/2001 | CN2431124Y Blackboard wiper duster |
| 05/16/2001 | CN2430288Y Dust collector for blackboard eraser |
| 05/16/2001 | CN2430287Y 无尘黑板刷 Clean the blackboard brush |
| 05/10/2001 | DE19944400C1 Device for damp wiping of writing board; has horizontal sponge support extending across board, for axially rotating sponge, where support slides vertically on rails attached to board edge |
| 05/09/2001 | CN2429341Y Dust-collecting blackboard eraser |
| 05/09/2001 | CN2429340Y Electric dust collecting blackboard eraser with a cylinder |
| 05/09/2001 | CN2429339Y Dust-collecting blackboard eraser |
| 05/09/2001 | CN2429338Y Dust-collecting blackboard eraser |
| 05/09/2001 | CN2429337Y Blackboard eraser |
| 05/02/2001 | CN2428313Y Dust-free blackboard eraser |
| 05/02/2001 | CN2428312Y Dust-free blackboard eraser |
| 05/02/2001 | CN2428311Y Novel blackboard eraser |
| 05/02/2001 | CN2428310Y Novel blackboard eraser |
| 05/02/2001 | CN2428309Y Dust-free blackboard eraser |
| 05/02/2001 | CN2428308Y Dust-free black-board eraser |
| 05/02/2001 | CN2428307Y Dust-suction chalk eraser |
| 05/02/2001 | CN2428306Y Dust-suction black-board eraser |
| 05/02/2001 | CN2428305Y Novel chalk eraser |
| 04/25/2001 | CN2427346Y Electric and chalk-absorbing blackboard wiper |
| 04/25/2001 | CN2427345Y Arc shaped returning, semi-sealing and multi-functional type chalk-dust free blackboard wiper |
| 04/25/2001 | CN2427344Y Remote control, full automatic chalk-dust remover of blackboard wiper |
| 04/25/2001 | CN2427343Y Electric roller and chalf dust-proof type blockboard wiper |
| 04/25/2001 | CN2427283Y Vortex type electric dust suction brush |
| 04/11/2001 | CN2426419Y Chalk dust-absorbing blackboard eraser |
| 04/04/2001 | CN2425791Y Dust-sucktion blackboard eraser |
| 04/04/2001 | CN2425790Y Novel electronic blackboard easer |
| 04/04/2001 | CN2425789Y Novel blackboard eraser |
| 04/04/2001 | CN2425788Y Novel blackboard eraser |
| 03/29/2001 | WO2001021324A1 Surface treating device |
| 03/28/2001 | CN2424942Y Pollutionless and dustless cleaner |
| 03/24/2001 | CA2305485A1 Surface treating device |
| 03/21/2001 | CN2424027Y Dustless eraser |
| 03/21/2001 | CN2424026Y Navel eraser |
| 03/21/2001 | CN1287923A Black board eraser with chalk dust absorbing means |
| 03/20/2001 | US6203878 Bulletin board accessories and accessory attaching mechanism |
| 03/14/2001 | CN2423120Y Eraser without dust |
| 03/14/2001 | CN2423119Y Brush-type eraser |
| 03/14/2001 | CN2423118Y Blackboard cleaning device |
| 03/14/2001 | CN2423117Y Eraser |
| 03/07/2001 | CN2422152Y Blackboard eraser |
| 02/28/2001 | CN2421179Y Automatic device for wiping blackboard |
| 02/28/2001 | CN2421176Y Electric non-dust teaching blackboard |
| 02/28/2001 | CN1285264A Multi-function suction cleaner |
| 02/21/2001 | CN2420145Y Dust suction blackboard eraser |
| 02/21/2001 | CN2420144Y 吸尘黑板擦 Eraser dust |
| 02/14/2001 | CN2419055Y Electric dust collecting blackboard eraser |
| 02/14/2001 | CN2419054Y Rotary dust collecting blackboard |
| 02/07/2001 | CN2418017Y Dust-collecting eraser for blackboard |