Did You Know...
...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7000668 | System and method for sealing openings in response to smoke, noxious fumes, or contaminated air using a roll-down barrier A system and method for rapidly and reliably sealing off a selected opening from the passage of smoke, noxious fumes, or contaminated air includes a powered clutch and viscous governor that provides a fail-safe mode of operation. A curtain is positioned in a housing... | 02/21/2006 |
| 6283189 | Swinging folding door and a swinging folding gate; and a swinging folding door with an emergency opening device and a swinging folding gate with an emergency opening device An emergency opening device for a swinging folding door or a swinging folding gate, using an electric motor drive with a switchable electromagnetic coupling for closing and opening the door panels. The door has an emergency opening device, whereby the eme... | 09/04/2001 |
| 5855027 | Automatic bathroom door and toilet flushing system A new automatic bathroom door and toilet flushing system for automatically raising the door and flushing the toilet when a user is finished. The system includes a housing secured to a ceiling between a pair of walls. The housing has an opening in a lower ... | 01/05/1999 |
| 5671984 | Exhibition apparatus A protective member is disposed in a contracted state thereof within an exhibition case for an exhibition apparatus. When a larger shaking of the exhibition case than a predetermined level is detected by a detector, an actuation mechanism expands the prot... | 09/30/1997 |
| 4991350 | Electromagnetically controlled cat flap A pet door comprises a frame defining an aperture in which a flap is pivotally suspended so as to close the aperture when it hangs vertically. A pet such as a cat can push the flap either way to pass through the aperture when entering or leaving a house. ... | 02/12/1991 |
| 4664169 | Venetian blind construction A louvre assembly between two transparent covers of a housing comprises lightweight louvres suspended and pivoted by lightweight filaments. A counterbalanced beam for pivoting the louvres can be operated by an electrical driving arrangement such as one in... | 05/12/1987 |
| 4173721 | Window shade controls and method associated therewith A method and device according to which it becomes possible to operate a window shade automatically. Thus, by way of this method and device a window shade can be automatically closed during the night and automatically opened during the day. In this way it ... | 11/06/1979 |
| 4062146 | Shade producing system A shade producing system including a powered track having a novel power driven motor for drawing a shade cloth between a gathered and extended position. The system may include suspension tracks for holding th cloth spread. Splicing means for the powered a... | 12/13/1977 |
