| Patents for B43L 1 - Repeatedly-usable boards or tablets for writing or drawing (5,148) |
|---|
| 11/06/1991 | EP0455147A1 Coordinate information input apparatus |
| 10/30/1991 | CN2087568U Frame-type double-face enamelled magnetic numerical drawing board |
| 10/29/1991 | US5060979 Information pad for checkbooks |
| 10/15/1991 | US5057363 Magnetic display system |
| 10/09/1991 | EP0450034A1 Three-dimensional drawing device |
| 10/09/1991 | CN2086210U 磁性黑板 Magnetic blackboard |
| 09/25/1991 | CN1054743A Board for writing and drawing |
| 09/18/1991 | CN2084882U Wearproof electric blackboad |
| 09/11/1991 | CN2084428U Children character copy board |
| 09/09/1991 | CA2019388A1 Memorandum device with tethered tool |
| 09/04/1991 | CN2084012U Board for writing of children |
| 09/04/1991 | CN2084009U Corona dusting blackboard |
| 08/28/1991 | CN2083547U Tool for magnetic pen writing |
| 08/28/1991 | CN2083546U 黑板 Blackboard |
| 08/28/1991 | CN1054036A Magnetic tracing board with music flasher |
| 08/21/1991 | CN2083118U Multi-functional reading or writing board capable of preventing myopia |
| 08/21/1991 | CN2083114U 彩色磁性书写板 Color magnetic writing board |
| 08/13/1991 | US5038482 Three-dimensional drawing device |
| 08/07/1991 | CN2082237U Automatic writing board |
| 07/24/1991 | CN2081347U Electric non-dust blackboard |
| 07/10/1991 | EP0435927A1 Message cover. |
| 07/10/1991 | CN2080467U Ring rotary rubber blackboard capable of auto-erasing |
| 07/10/1991 | CN2080466U Board type copybook for calligraphy in writing brush |
| 07/03/1991 | EP0435421A1 Copying apparatus |
| 07/03/1991 | CN2080029U Magnetic blackboard |
| 07/03/1991 | CN2080028U Automatic winding dust-suction blackboard |
| 06/11/1991 | US5023408 Electronic blackboard and accessories such as writing tools |
| 06/11/1991 | US5022170 Work surface information display pad |
| 06/05/1991 | CN2078235U Magnet board capable of picture sticking or writing |
| 05/29/1991 | CN2077800U Screen type dustfree blackboard |
| 05/29/1991 | CN2077799U Depictive copy board |
| 05/28/1991 | US5018979 Magnetic visual display |
| 05/22/1991 | CN2077377U Magnetic blackboard |
| 05/17/1991 | WO1991007287A1 Magnetic visual display |
| 05/15/1991 | CN1051327A Multi-coloured magnetic writing board |
| 05/08/1991 | CN2076492U Rotary type electric auto-erasing blackboard |
| 05/08/1991 | CN2076491U Rolled dual-purpose teaching blackboard |
| 05/08/1991 | CN2076490U Multipurpose blackboard with changeable lining board for practice of writing characters |
| 05/01/1991 | CN2076033U Teaching aid |
| 04/24/1991 | CN2075595U 多色彩磁性书写板 Multi-color magnetic writing board |
| 04/24/1991 | CN2075594U Automatic erasing blackboard |
| 04/24/1991 | CN2075593U Non steel made blackboard convenient for map hanging |
| 04/24/1991 | CN2075460U Stationery box capable of hard pen calligraphy exercise |
| 04/17/1991 | EP0422063A1 Erasable writing device |
| 04/17/1991 | CN2075146U 竹制黑板 Bamboo blackboard |
| 04/17/1991 | CN2075145U Multipurose dustless blackoard with auto-control life for teaching |
| 04/12/1991 | WO1991005669A1 Three-dimensional drawing device |
| 03/27/1991 | CN2073820U Magnetic dustless writting device |
| 03/27/1991 | CN2073819U Adjustable color and figure writing plate |
| 03/27/1991 | CN1050160A Exercise board for writing and drawing |
| 03/21/1991 | DE4026129A1 Height-adjustable blackboard on wall - has guide rails with stops and includes counterweight |
| 03/13/1991 | CN2072912U Multifunction roll blackboard |
| 03/06/1991 | CN2072481U Hand control intelligence drawing board |
| 03/05/1991 | US4998185 Use by driver in vehicle |
| 03/01/1991 | CA2023689A1 Multi-purpose navigation board |
| 02/26/1991 | US4996110 Having cleanliness, brightness, flexibility for rolling, high surface hardness |
| 02/13/1991 | CN2071134U Fordable adjustable nearsight-proof writing board |
| 02/12/1991 | CA1280074C Electronic print board system |
| 01/30/1991 | CN1048821A Fully automatic blackboard for handwriting, picture drawing and sound and picture coopreation |
| 01/29/1991 | US4988301 Luminescent writing and display device |
| 01/23/1991 | CN2069801U Multi-picture painted screen |
| 01/15/1991 | US4985302 Removable self-adhesive sheet with writable surface |
| 01/09/1991 | CN2068917U Writing board with display |
| 01/09/1991 | CN1048355A Double colour, permanent-magnetic writing board |
| 01/02/1991 | CN2068465U Multipurpose colour water writing board |
| 12/26/1990 | CN2068054U Belt-type cycle blackboard |
| 12/25/1990 | US4980776 Electronic copying machine having a line sensor in which the charge storage time is set based on image signals of the previous scan line |
| 12/19/1990 | CN1047829A Colour and light changeable writing plate |
| 12/18/1990 | US4978568 Having chalk dust collector; durability |
| 11/15/1990 | DE3925578C1 Invisible writing unit for temporarily recording information - provides writing surface of magnetisable plate or foil reacting to writing implement with magnet |
| 11/14/1990 | CN2065562U Dustless writing board |
| 11/07/1990 | CN2065150U Writing scroll |
| 11/07/1990 | CN2065149U Chart blackboard specially adapted for teaching |
| 10/31/1990 | CN2064714U 玻璃黑板 Glass blackboard |
| 10/24/1990 | CN2064306U Magnetic showning face and system thereof |
| 10/24/1990 | CN2064305U Writing board with cdour changing function |
| 10/24/1990 | CN2064304U Combined blackboard being able to suspend magnetic hanging chart |
| 10/10/1990 | CN2063483U Rotary belt type automatic dust-wiping blackboard |
| 10/03/1990 | EP0390270A1 A board, in particular a writing board |
| 10/03/1990 | CN1009813B Dustless and wearless writing-board |
| 10/02/1990 | USRE33363 Magnetic tracing apparatus |
| 09/29/1990 | WO1990011183A1 Re-usable writing material |
| 09/29/1990 | CA2048611A1 Re-usable writing material |
| 08/21/1990 | US4949466 Drawing device having indexable stylus turret |
| 07/05/1990 | DE3844000A1 Writing and drawing set |
| 07/03/1990 | US4939588 Electronic copying machine |
| 06/05/1990 | US4931019 Electrostatic image display apparatus |
| 05/30/1990 | CN2057621U Eraser for magnetic writing board |
| 05/30/1990 | CN2057618U Reading and writing posture correcting unit |
| 05/22/1990 | US4927748 Luminescent writing or display device |
| 05/02/1990 | EP0365712A1 Suspendable writing pad assembly |
| 04/18/1990 | CN1007666B Magnetic blackboard |
| 04/11/1990 | CN2055776U 黑板 Blackboard |
| 04/05/1990 | WO1990003277A1 Message cover |
| 03/27/1990 | US4911476 Information pad for checkbooks |
| 03/13/1990 | US4908742 Portable desk unit |
| 03/07/1990 | CN1040279A Electronic blackboard device and articles for writing thereof |
| 03/07/1990 | CN1040172A 无尘磁力黑板 Magnetic blackboard clean |
| 02/28/1990 | CN2053573U Blackboard without powder |
| 02/21/1990 | CN2053149U Magnetic display board |