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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7303282 | Multimedia display device A multimedia display device includes a docking station having speakers and a media drive, wherein the docking station is configured to structurally and communicatively couple an image projection device to the docking station. ... | 12/04/2007 |
| 7144114 | Systems and methods for displaying simulated images The invention provides systems and methods for generating a visual image that is made to appear to be situated behind an architectural structure, such as a wall of a building, and is viewed through windows thereof. The image appears as an oversize object relative to... | 12/05/2006 |
| 7097307 | Systems and methods for displaying simulated images The invention provides systems and methods for generating a visual image that is made to appear to be situated behind an architectural structure, such as a wall of a building, and is viewed through windows thereof. The image appears as an oversize object relative to... | 08/29/2006 |
| 7055956 | Image-rendering device The present invention provides an image-rendering device for an image projector. The image-rendering device includes a body having an image receiver adapted to alternatively receive a first interchangeable data transfer device and a second interchangeable data trans... | 06/06/2006 |
| 6962417 | Keystone correction system and method The invention relates to a keystone correction system and method. The system includes a projector for projecting an image on a projection surface and a platform to allow a user to vertically rotate the projector before horizontally rotating the projector. The projec... | 11/08/2005 |
| 6550922 | Audio-video recording of overhead projector based presentations The present invention relates to the audio-video recording of overhead projector based presentations. The apparatus (1) comprises an audio microphone (29), a logging element (20, 21, 27) for logging when a presenter changes a viewable object such as an ov... | 04/22/2003 |
| 5812099 | Portable audio-visual virtual-reality system An audio-visual, virtual-reality system making it possible for a user to see, during successive time periods, a still image of a particular subject while listening to a program relating to that subject. The system consists of a standard record player coup... | 09/22/1998 |
| 5424790 | Projection apparatus A projection apparatus comprising a holding section for holding a film cassette having an exposed magnetic-zoned film therein, motors for automatically drawing out the leader portion of the film from the film cassette and for forwardly feeding the film wi... | 06/13/1995 |
| 5266980 | Synchronized audio visual story-telling toy An audio visual story-telling toy projects pictures on a surface such as a ceiling or a wall while a story recorded on an audio cassette is played. The toy is a small, self-contained unit which includes a tape player and a synchronized picture strip proje... | 11/30/1993 |
| 4884885 | Microfilm aperture card, in particular camera card A microfilm aperture card having a window for mounting a microfilm, and an adhesive tape which extends around the opening in the card, and covering the edges of the microfilm and the window opening, the adhesive tape being adapted to carry identification ... | 12/05/1989 |
| 4791496 | System for presenting audiovisual information to an audience With an audiovisual information presentation system, pictorial image data, drawn on paper sheets in advance and to be optically projected on a screen using an optical projector, is sequentially sensed by a TV camea. Speech corresponding to the image data ... | 12/13/1988 |
| 4765734 | Digitally encoded alpha-numeric projector slide and systems for using the same The present invention includes an information projector slide comprising a planar member having a central window for holding a photographic film image and at least one border adjacent the window. A magnetic medium for storing selected digitally encoded al... | 08/23/1988 |
| 4758485 | Slides and recording method for audiovisual slide show An audiovisual slide show is recorded by collecting a set of slides having pictures dealing with a broad topic. A strip of laser recording material is disposed on each slide. A laser writes a data pattern corresponding to spoken words on the strip. The wo... | 07/19/1988 |
| 4473280 | Audio-visual cartridge and combined audio player and visual viewer An audio-visual cartridge containing two coplanar adjacent rotatable discs, a visual disc carrying a plurality of picture transparencies mounted in a ring for successive viewing and an audio disc having sound recording tracks on a face thereof for individ... | 09/25/1984 |
| 4277152 | Controls for synchronizing audio signals with film advancement in a projector A synchronized audio visual system including an audio program source capable of producing a film advance signal at predetermined intervals and a projector interconnected therewith. The projector has a source of light for passing light through an aperture ... | 07/07/1981 |
| 4272167 | Projector cartridge for a filmstrip and a tape cassette A cartridge is disclosed for an audiovisual filmstrip projector. The cartridge holds a filmstrip and a standard magnetic tape cassette. Spring hooks are provided on a mounting plate of the cartridge for releasably attaching the cassette by a single motion... | 06/09/1981 |
| 4122613 | Operator responsive audio-visual teaching apparatus A programmable, operator responsive, audiovisual teaching apparatus includes a rear screen projector for displaying visual information and an audio reproduction unit providing correlated audiovisual presentations in a sequence corresponding to a branched ... | 10/31/1978 |
| 4067647 | Dual film strip projector A dual film strip projector projects images onto at least one screen from a pair of film strips, each of which is advanced in programmed timing independently of the other. The film strips are contained in a cartridge that is readily insertable in the proj... | 01/10/1978 |
| 4043651 | Audio-visual device An audio-visual reproducing device is disclosed which utilizes a program unit having a structure for producing an audio signal and carrying a plurality of visual representations. The program unit is mounted in the device so that a rotatable pick-up is mov... | 08/23/1977 |
| 4037951 | Audio-visual cartridge and player A film cartridge having a film to be projected, a magnetic tape with a sound signal and film feeding signals, a housing for accommodating therein the film and tape separately therein, a reflector for projecting light passing the film and a locking mechani... | 07/26/1977 |
| 4020503 | Still image slide with sound track control Means for providing stationary images from slides and sound related to these images include a retainer for insertion of a slide, an endless taut magnetic tape mounted within the retainer, and stationary magnetic heads that impose sound tracks on the tape ... | 04/26/1977 |
| 4014604 | Sound slide There is disclosed sound slide assemblages which comprise a generally rectangular body incorporating an image bearing portion and a magnetic sound track portion. The image bearing portion is adapted to receive either a mounted or unmounted transparency. T... | 03/29/1977 |
| 4010491 | Automatically retractable tape in sound-slide means A slide and magnetic tape retainer provides capability of insertion of a mounted transparency and has a spiral spring type tape that is self retractable, after being transported, to its original position. The tape is guided for non-interference with the s... | 03/01/1977 |
| 3999848 | Audio-visual cartridge A cartridge having a film handling portion and an audio tape cassette storing portion for use with an audio-visual system. The film storing portion includes a supply and take-up reel which are coupled by an intermediate gear so that the rotation of one re... | 12/28/1976 |
| 3999845 | Mechanical sound reproducing means for an audio-visual device A tone-arm generally in the form of a unitary right-angle member has first and second arms extending at approximately 90° to each other. A needle is supported by one of the arms, the other arm being connected to a stem which is in turn connected to the s... | 12/28/1976 |
| 3973842 | Magazine for slides for the simultaneous projection of pictures and reproduction of sound This invention relates to camera apparatus having a mechanism containing transparent slides for projection, and, with this, there is provided a mechanism for including with these slides related sound records for reproduction concurrently with the pictoria... | 08/10/1976 |
| 3953118 | Reset mechanism for an audio-visual device An audio-visual unit includes a disc mounting a plurality of discrete image transparencies arranged in a continuous pattern for successive visual display; a record co-axially mounted on the disc includes separate recorded messages corresponding to respect... | 04/27/1976 |
| 3942269 | Audio-visual system including audio-visual slides An audio-visual system for providing correlated audio and visual presentations from audio-visual slides in a sequence corresponding to a branched learning format. Upon an operator selecting a presented response choice, a projected program containing first... | 03/09/1976 |
