| Patents for B43L 1 - Repeatedly-usable boards or tablets for writing or drawing (5,148) |
|---|
| 02/07/1990 | CN2052355U Tape-type rotary blackboard |
| 01/24/1990 | CN2051568U Dustless rolling blackboard capable of automatic erasing |
| 01/03/1990 | CN2050384U Vertical electric dust-proof blackboard |
| 12/28/1989 | WO1989012556A1 Erasable writing device |
| 12/27/1989 | EP0347725A2 Electronic blackboard and accessories such as writing tools |
| 12/27/1989 | CN2050008U Fast-speed self-wipping aspirating blackboard |
| 12/26/1989 | US4888874 Drawing device having mobile stylus tracing lines on glass plate |
| 11/15/1989 | CN2047633U Copying tablet for writing |
| 11/08/1989 | CN2047229U Revolving-belt type no dust blackboard |
| 09/27/1989 | CN2044935U Film-type copy exercise book |
| 09/27/1989 | CN2044934U Self-cleaning dustless blackboard |
| 09/13/1989 | EP0332518A2 Method of producing magnetic sign boards, and sign boards so obtained |
| 09/05/1989 | US4863537 Tracing paper with light tack adhesive coating |
| 09/05/1989 | US4863113 Measuring device |
| 08/23/1989 | CN2043188U Winding type multipurpose blackboard |
| 08/23/1989 | CN2043187U Screen-face negative pressure box type dust catching blackboard |
| 08/16/1989 | EP0327665A2 Removable self-adhesive sheet with writable surface |
| 08/16/1989 | CN2042798U Magnetism blackboard |
| 08/16/1989 | CN2042797U Magnetic blackboard without dust |
| 08/15/1989 | US4858021 Electronic blackboard capable of providing hardcopy |
| 08/15/1989 | US4856197 Drawing device having retractable stylus |
| 08/02/1989 | CN2042018U Reusable writing plate |
| 08/01/1989 | US4853495 Electronic blackboard and electronic blackboard system |
| 08/01/1989 | US4852282 Magnetic calendar frame |
| 07/12/1989 | CN2040852U Composite blackboard |
| 06/29/1989 | WO1989005734A1 Work surface information display pad |
| 06/21/1989 | EP0321113A2 Imaging apparatus fo scanning projected and written images |
| 06/21/1989 | CN2039628U Hand or power operated blackboard without dust |
| 06/14/1989 | CN2039266U 黑板 Blackboard |
| 06/07/1989 | CN2038845U Civilized writing board |
| 05/31/1989 | CN2038452U Over a wall learning board to be hung |
| 05/31/1989 | CN1033171A 黑板 Blackboard |
| 05/30/1989 | US4834334 Turn and tilt easel |
| 05/24/1989 | CN2038055U Multifunction plate display device |
| 05/16/1989 | CA1254161A1 Herpes virus specific immunological materials and methods |
| 05/10/1989 | CN2037318U Vertical dustless writting blackboard |
| 05/10/1989 | CN2037317U Writting and painting board for child |
| 05/09/1989 | US4828502 Convertible dry wipe board |
| 04/19/1989 | CN2036113U Moving blackboard |
| 04/05/1989 | CN2035320U Portable blackboard |
| 04/05/1989 | CN2035319U Automatic blackboard for teaching |
| 04/04/1989 | US4819078 Electronic print board system |
| 03/29/1989 | CN2034910U Permanent copy book of model writing |
| 03/22/1989 | CN2034526U Caterpillar revolving blackboard |
| 03/14/1989 | US4812914 Electronic print board apparatus |
| 03/08/1989 | CN2033749U 树脂黑板 Resin blackboard |
| 03/01/1989 | CN2033344U Large-scale push-type machine blackboard |
| 03/01/1989 | CN1031349A Dust-absorbing blackboard |
| 02/15/1989 | CN2032552U Rotable aromatic magnetic writing board and pen |
| 02/15/1989 | CN2032551U Rotary dust-free blackboard |
| 02/14/1989 | US4804327 Magnetic tracing apparatus |
| 02/07/1989 | US4803564 Electronic blackboard system |
| 02/01/1989 | CN2031764U Fragrant magnetic blackboard |
| 01/31/1989 | US4801266 Irridescent drawing or sketching device |
| 01/25/1989 | CN2031355U Dustless blackboard |
| 01/18/1989 | CN2030947U Up and down movable blackboard |
| 01/18/1989 | CN1030382A Dustless and wearless writing-board |
| 01/12/1989 | DE3820940A1 Wall board with panel use |
| 01/04/1989 | CN2030149U Electric soft blackboard |
| 01/04/1989 | CN2030148U Rhombus magnesium blackboard |
| 12/28/1988 | EP0296867A2 Electronic blackboard and electronic blackboard system |
| 12/21/1988 | CN88201190U 可动式黑板 Movable blackboard |
| 11/22/1988 | US4786010 Tape measure |
| 11/16/1988 | CN87209703U Auto-wiping blackboard |
| 11/09/1988 | CN88200189U Multipurpose educational board |
| 11/03/1988 | DE3712984A1 Device for cleaning rolls of film |
| 11/02/1988 | CN87215232U Blackboard made of high molecular composite |
| 10/11/1988 | CA1242879A1 Electronic print board |
| 10/05/1988 | CN87204778U Magnetic blackboard |
| 09/27/1988 | US4773786 Board for writing with pen producing erasable marking, the board having a header in the upper part, hooked to the board by means of a special attachment |
| 09/14/1988 | CN87216990U Electrical teaching plate for writing |
| 09/07/1988 | CN87209288U Intelligence learning board (ball) |
| 09/07/1988 | CN87200955U Rolling-up curtain type black board |
| 08/16/1988 | US4763929 Erasable marker system |
| 08/16/1988 | CA1240505A1 Electronic print board |
| 08/10/1988 | CN87212265U Automatic erasing dustless blackboard |
| 08/02/1988 | US4761139 Drawing board type amusement device |
| 07/27/1988 | CN88210028U Exercise-plate for calligraphy |
| 07/20/1988 | CN87216170U Writing board for teaching |
| 07/20/1988 | CN87210732U Electromagnetic writing unit |
| 07/13/1988 | CN87215717U Roll-up type self-cleaning dustless blackboard |
| 07/05/1988 | US4755882 Electronic blackboard capable of providing hardcopy |
| 06/29/1988 | CN87204323U Rotary three-view blackboard |
| 06/22/1988 | EP0272102A2 Electronic print boards |
| 06/22/1988 | CN87209843U Arithmetic exercise board |
| 06/22/1988 | CN87207991U Showing board with magnetic material |
| 06/21/1988 | US4752803 Board recording apparatus |
| 06/15/1988 | CN87210927U 橡胶黑板 Rubber blackboard |
| 06/15/1988 | CN87206746U Magnetic teaching aids |
| 06/14/1988 | US4751584 Display-reproducing apparatus |
| 06/08/1988 | CN87206621U Dual purpose magnetic blackboard for plain and arc surface |
| 06/01/1988 | CN87212100U Blackboard with a layer of fluid |
| 06/01/1988 | CN87205216U Stationery case with writing board |
| 05/24/1988 | US4746576 Writing screen |
| 05/18/1988 | CN86107623A Multi-functional equipment for erasing hand-writings on the magnetic writing board |
| 05/17/1988 | US4745286 Luminous sheet and indicia |
| 05/17/1988 | US4745182 Herpes virus specific immunological materials and methods |
| 05/11/1988 | CN87207805U Multipurpose pocket blackboard |
| 05/05/1988 | DE3635735A1 Device for, and method of, setting up design plans |
| 05/04/1988 | CN87214322U 磁性塑料片 Magnetic plastic sheet |