| Patents for B43L 1 - Repeatedly-usable boards or tablets for writing or drawing (5,148) |
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| 05/04/1993 | US5207581 Writing apparatus including electret film |
| 04/28/1993 | CN2130700Y 多功能磁力黑板 Multifunctional magnetic blackboard |
| 04/28/1993 | CN2130699Y Dust obsorbing blackboard |
| 04/28/1993 | CN2130698Y Studying board for children |
| 04/28/1993 | CN2130697Y Multipurpose writing board foldable into file |
| 04/28/1993 | CN2130397Y Multifunctional stationery case |
| 04/21/1993 | CN2130056Y Straight back writing board |
| 04/20/1993 | US5203702 Writing board kit having light-sensitive self-illuminating drawing surface |
| 04/14/1993 | CN2129688Y Multiple picture dustless blackboard |
| 04/06/1993 | US5200853 Board for screening and writing and a method for the production thereof |
| 03/31/1993 | CN1070369A 消光塑料黑板 Extinction plastic chalkboard |
| 03/24/1993 | CN2128590Y Multi-layer blackboard |
| 03/17/1993 | CN2128204Y Magnetic writing and drawing board |
| 03/17/1993 | CN1069934A Blackboard |
| 03/10/1993 | CN2127842Y Health care board for reading and writing |
| 03/10/1993 | CN1069695A Magnetic blackboard and its attachments of magnetic pen and magnetic eraser |
| 03/03/1993 | CN1069452A Luminous writing board |
| 02/24/1993 | CN1069224A Plastic blackboard surface material and its production method |
| 02/16/1993 | US5186631 Magnetic display device |
| 02/10/1993 | CN2126827Y Exercise board for pupil |
| 01/20/1993 | CN1068066A Thermoplastic sheet specially for hard calligraphy depiction and production thereof |
| 01/13/1993 | CN1067850A Magnetic writing board and writing, erasing utensils |
| 01/12/1993 | US5178420 Reusable facsimile transmittal sheet and method |
| 01/05/1993 | US5176522 Erasable marker board assembly |
| 12/30/1992 | EP0500741A4 Magnetic visual display |
| 12/30/1992 | CN2126160U Transparent copying board for practising calligraphy |
| 12/30/1992 | CN1067406A Health-care blackboard for protecting vision and eliminating dust |
| 12/23/1992 | WO1992022434A1 A label |
| 12/23/1992 | CA2111194A1 Label |
| 12/16/1992 | CN2124823U Powder-coating metal blackboard |
| 12/16/1992 | CN1019465B Magnetic tracing board with music flasher |
| 12/09/1992 | CN2124142U 磁针式书写板装置 Magnetic stylus tablet device |
| 12/09/1992 | CN2124141U Permanent-magnet teaching blackboard |
| 12/02/1992 | CN2123435U Luminous writing board |
| 11/25/1992 | EP0515015A2 Method and apparatus for interacting with a computer generated projected image |
| 11/25/1992 | CN2122738U Enclosed full-automatic erasing dustless blackboard |
| 11/17/1992 | US5163846 Toy using water reactive paper |
| 11/04/1992 | CN2120687U Automatic dust removing blackboard |
| 10/21/1992 | CN2119333U Drawing board |
| 10/21/1992 | CN2119332U Handy writing and reading table |
| 10/14/1992 | CN2118638U Constructure of magnetic drawing board |
| 09/29/1992 | US5151032 Magnetophoretic display panel |
| 09/23/1992 | CN2116591U Two-face combined blackboard with box |
| 09/22/1992 | US5148601 Spherical drawing template |
| 09/09/1992 | CN2115225U Automatic dust abatement writing blackboard |
| 09/09/1992 | CN2115224U Rotary blackboard |
| 09/09/1992 | CN2115223U Multipurpose wrinting plate |
| 09/08/1992 | US5146345 Foldable electronic print board with centrally located printer for stability |
| 09/02/1992 | EP0500741A1 Magnetic visual display. |
| 09/02/1992 | CN2114572U Magnetic writing and painting board |
| 08/26/1992 | CN2113893U Dustless teaching aid |
| 08/19/1992 | CN2113167U Magnetic-inductive blackboard |
| 08/19/1992 | CN2113166U Polishing microdust blackboard |
| 08/19/1992 | CN1063642A High-resolution magnetic writing plate and making method thereof |
| 08/12/1992 | CN2112512U Xuan paper imitating drawing board |
| 08/12/1992 | CN2112498U Multi-use book keeping books with ability fo repeated use |
| 08/05/1992 | CN2111853U Multifunctional mathematics blackboard |
| 08/05/1992 | CN2111852U Blackboard made of glass fibre reinforced plastic |
| 08/05/1992 | CN2111851U Writing plate |
| 08/05/1992 | CN1063254A Dust-free blackboard, chalk and eraser installation |
| 07/08/1992 | CN2109314U Multi-colour magnetic writing board |
| 07/08/1992 | CN2109313U Teaching aid series of board, eraser and pen |
| 07/08/1992 | CN2109312U Screen type board for teaching aid |
| 07/01/1992 | CN1062317A Plastic sheet special for tracing calligraphy with hard-tip pen and productive method thereof |
| 06/17/1992 | CN1061937A Myopia-preventing board for doing assignment |
| 05/27/1992 | CN2105408U Magnetic blackboard |
| 05/27/1992 | CN2105407U Automatic lifting blackboard |
| 05/27/1992 | CN2105406U Automatic water erasing blackboard |
| 05/27/1992 | CN2105405U Rolling writing board |
| 05/27/1992 | CN2105404U Multi-purpose practising board for student |
| 05/20/1992 | CN2104762U Multi-paged blackboard |
| 05/20/1992 | CN1061185A Dust-collecting type chalk writing board |
| 05/19/1992 | US5115330 Liquid crystal writing slate |
| 05/13/1992 | CN2104133U Three-colour moved word-pieced plate |
| 05/12/1992 | US5112229 Magnetic visual display |
| 05/05/1992 | US5110295 Educational tracing device |
| 04/08/1992 | CN2100987U Magnetic coordinate drawing board |
| 04/08/1992 | CN2100986U Colour drawing board |
| 03/25/1992 | CN1059686A Easy erasing writing board |
| 03/18/1992 | CN2099033U Board for writing |
| 03/11/1992 | CN2098386U Praft board for student doing homework |
| 03/04/1992 | CN2097748U Automatic wipping no-dust blackboard |
| 02/26/1992 | CN2097097U Multifunctional recreation writing-underlay |
| 02/26/1992 | CN2097096U Dynamic simulating display board for quality administration of production |
| 02/12/1992 | CN2095776U 磁性玻璃黑板 Magnetic glass blackboard |
| 02/11/1992 | US5087079 Watertight note card assembly |
| 02/05/1992 | CN1058374A Roller-type blackboard |
| 02/05/1992 | CN1058373A Magnetophoretic display panel |
| 01/29/1992 | CN2094457U Dust removing health blackboard |
| 01/28/1992 | US5083925 Copying apparatus |
| 01/22/1992 | CN2093754U Impression eliminator |
| 01/22/1992 | CN2093753U Writing board and writing pen with a water-storage tube |
| 01/15/1992 | CN2092910U Adjustable table board |
| 01/14/1992 | US5079851 Notation area insert for a tape measure |
| 12/25/1991 | CN2091227U Two-purpose two-face blackboard with hanging chart |
| 12/25/1991 | CN1057231A Electrostatic blackboard dust collecting method and its equipment |
| 12/11/1991 | CN2090328U High clearness magnetic writing board |
| 11/27/1991 | CN2089413U Cloth curtain type blackboard |
| 11/13/1991 | CN2088485U Baby studying device |
| 11/13/1991 | CN2088366U 多功能文具盒 Multifunction stationery |