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"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 7287751 | Barrier game display unit education system The invention is directed to an educational system for use in instruction of educational concepts while playing a game. The system consists of a game sheet having an illustration for use in instruction of an educational concept, a set of magnetic playing pieces asso... | 10/30/2007 |
| 7269912 | Methods and apparatuses for mounting a flat panel video display Mounting tools and methods for using mounting tools are disclosed herein. In one embodiment, a mounting tool includes a template having a body configured to be releasably attachable to a support medium. The mounting tool further includes a projecting member configur... | 09/18/2007 |
| 6983919 | Adjustable display device for computer monitors An adjustable display device for computer monitors includes a pair of panels that are slidably connected together such that the display device has a compact configuration and a plurality of extended configurations. The slidability of the panels allows the display de... | 01/10/2006 |
| 6962016 | Picture frame and hanger A picture frame and hanger bar together provide a picture hanging system that requires a single hanger bar in addition to the picture frame itself. The picture frame hanger has a wall mounting surface that during use is affixed to the wall or other vertical surface ... | 11/08/2005 |
| 6961073 | Method and system for displaying an image on a screen A public presentation system is presented comprising a display system that can be remotely changed, so that multiple different images are successively displayed with minimal interruption. The system utilizes ionography techniques for non-contact printing and imaging... | 11/01/2005 |
| 6955130 | Reading and writing center A teaching center is provided with first and second upstanding frame sections separated by two or more lateral connectors to form a generally “H” shaped frame. The second upstanding frame section is vertically oriented and the first upstanding frame section is i... | 10/18/2005 |
| 6948210 | Automated board eraser An automated erasure system that is suitable for erasure of non-permanent markings from boards is disclosed. The boards being erased can be whiteboards (whether electronic or not) or other boards (e.g., chalkboards). ... | 09/27/2005 |
| 6944904 | Chalkboard cleaning apparatus with a fluid reservoir The present invention 10 discloses a chalkboard cleaning device that is mountable to a conventional chalkboard 12 providing means for selectively cleaning parts thereof. The present invention 10 is comprised of a rail 18 mounted to the to... | 09/20/2005 |
| 6895627 | Blackboard eraser A blackboard eraser including a cube having two semi-cylindrical grooves symmetrically arranged in a longitudinal direction therein, and a central brush atop an elevated surface formed between the two grooves. A longitudinal groove is defined underneath each of the ... | 05/24/2005 |
| 6370720 | Apparatus and a method for automatically erasing a blackboard An automatic blackboard erasing apparatus reciprocates, or moves back and forth, horizontally on a blackboard. The automatic blackboard erasing apparatus incorporates a housing, right and left erasing elements each having one or more brushes and one or mo... | 04/16/2002 |
| 6266841 | Automatic erasing device for erasing chalk marks on a writing board by water An automatic erasing device is used for erasing chalk marks on a writing board, and includes an erasing mechanism having an elongated housing disposed frontwardly of and slidable relative to the writing board along a longitudinal axis. The housing extends... | 07/31/2001 |
| 6139331 | Board base apparatus A board base provides a storage and display unit for a plurality of markable white erasable presentation panels. Such presentation panels can be used with erasable marker pens. The board base can display one presentation panel and store four additional pr... | 10/31/2000 |
| 5957700 | Writing board Writing boards such as electric blackboards which can erase all information written thereon without wiping the board by hand. On a front surface of an endless recording medium provided in the electric black board letters, characters, etc. are written with... | 09/28/1999 |
| 5649828 | Writing board system A writing board system comprises a white board having a writing surface for receiving a written mark thereupon, a liquid tank filled with water liquid for erasing the written mark from the writing surface, an applicator for applying the liquid in the liqu... | 07/22/1997 |
| 5607312 | Writing board with an automatic erase device A writing board with an automatic erase device includes a frame, a driving roller and a supporting roller rotatably mounted on the frame in a parallel manner, an endless writing sheet trained around the driving and supporting rollers to form a front expos... | 03/04/1997 |
| 5430965 | Message display board A message display board includes: a writing board embedded on a base plate mounted on a fixing object such as a car, a pen clamped on a pen-holding portion formed on the base plate for writing purpose, a plurality of suction cups which are attached by vac... | 07/11/1995 |
| 5397091 | Blackboard A blackboard includes a rectangular board member, a protective frame member provided on each side of the board member, and a tray connected to a lowermost one of the frame members and movable between an unfolded position for receiving erasers and writing ... | 03/14/1995 |
| 5163845 | Portable free-standing visual aid A portable, free-standing visual aid designed to be used by coaches, teachers and other group leaders. The invention incorporates a large chalkboard, a chalk tray, sliding, two-sided inserts, a storage pocket for the inserts, and a smaller storage pocket ... | 11/17/1992 |
| 5131849 | Teaching board apparatus A board apparatus is arranged for educational presentation of inter-relationship relative to atomic particles and their associated energy levels relative to interaction of such particles, wherein the board structure includes a central ferrous metallic bas... | 07/21/1992 |
| 4941225 | Automatic chalk-powder collecting device for blackboard eraser This invention relates to an automatic chalk-powder collecting device for blackboard eraser; it mainly comprises a body portion, two symmetrical side covers, a powder box, and a powder-collecting assembly. By means of the aforesaid structure and a one-way... | 07/17/1990 |
| 4872237 | Chalk dust remover A chalk dust remover is disclosed to remove the chalk dust which has accumulated on the surface of a chalk board cleaner. The device has a housing, a perforated support member, and a sheet of porous, open cell foam material which extends over the support ... | 10/10/1989 |
| 4742594 | Blackboard eraser An improved blackboard eraser used for automatically erasing the chalk dust comprises a housing, in which several sets of brushes and rollers in number corresponding to the brushes are installed. The rollers are made of suitable chalk-erasing material and... | 05/10/1988 |
| 4596059 | Automatic dust-removing eraser of a rolling-friction type for blackboard An automatic dust-removing eraser of a rolling-friction type for use on a blackboard includes: a casing body having an open section or cavity in the central portion; a plurality of different guiding slots vertically formed at both ends of the side walls d... | 06/24/1986 |
| 4549327 | Cleaner and chalk dust receptacle for chalk board erasers A cleaner and chalk dust receptacle for chalk board erasers comprises a box shaped container which is received and supported within a wall mounted cover member. The container has an open top, a bottom wall, a back wall, a front wall, and a pair opposed si... | 10/29/1985 |
| 4462134 | Blackboard eraser A blackboard eraser comprising a base, an uppermost cover mounted on the base, two erasing rollers pivotedly mounted within the base, a controller and two scrapers wherein the controller normally engages with the rollers for erasing use and may be depress... | 07/31/1984 |
| 4437839 | Chalkboard with hinged chalk rail An indicia receiving board, such as a chalkboard, or marker board having a writing surface and a longitudinal folding rail hinged at its ends and projecting forwardly from the bottom of the board. The hinged arrangement provides a rail which may be folded... | 03/20/1984 |
| 4100684 | Holder device for paper articles and writing instruments A holder device for holding paper articles and writing instruments includes a housing having a pair of compartments therein. A permanent magnet is mounted on the housing and is removably received on a ferrous metallic bar which is mounted on a stationary ... | 07/18/1978 |
