Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7158802 | Method and apparatus for providing a highly reliable ACK/NACK for time division duplex (TDD) and frequency division duplex (FDD) An ACK/NACK method and system for use in time division duplex (TDD) and frequency division duplex (FDD) systems. In high speed downlink packet access (HSDPA), based on the assignment of timeslots for the high speed shared information channel (HS-SICH), each user equ... | 01/02/2007 |
| 7139595 | Transit vehicle wireless transmission broadcast system A transit vehicle wireless transmission broadcast system for wirelessly transmitting multimedia content from one transit vehicle to another transit vehicle for broadcast of the multimedia content to passengers traveling in the transit vehicles. Each transit vehicle ... | 11/21/2006 |
| 6535138 | HVAC network verification system A system for verifying the operability of one or more HVAC devices in a communication network includes a network control device that sends a particular type of message to the HVAC devices. Each HVAC device receiving the message will initiate a clearly vis... | 03/18/2003 |
| 6317047 | Firefighter's safety device A fire fighter's safety device, comprising a hollow body having a sidewall, a top end and a bottom end and an arm connected to the body and extending parallel to the sidewall. There is a light source disposed at one of the top and bottom ends and an audib... | 11/13/2001 |
| 6090056 | Resuscitation and alert system A resuscitation device for automatic compression of victim's chest using a compression belt which exerts force evenly over the entire thoracic cavity. The belt is constricted and relaxed through a motorized spool assembly which repeatedly tightens the bel... | 07/18/2000 |
| 5392771 | Underwater monitoring and communication system A monitoring device for portable breathing apparatuses having a manometer by means of which the pressure in the pressure container of the breathing apparatus is detected, and having a transmitter by means of which a signal corresponding to the pressure is... | 02/28/1995 |
| 5086391 | Remote controller for activating speech messages and for contacting emergency services A medical alert system for domestic use wherein the system is comprised of two major components, a device worn about the neck and a home computer. The device worn about the neck and the home computer reciprocally communicate with one another to provide th... | 02/04/1992 |
| 4137530 | Digital radar display smoothing A digital radar including (i) a digital memory whose stored array of digital words represents radar searched space and (ii) display smoothing apparatus receiving the memory data and quadrupling the number of digital words available for display. Typical of... | 01/30/1979 |
| 4040013 | Citizens alarm system A combined police and fire alarm system has provision for voice communication between street corner boxes and a central station via existing telegraphic cables. The boxes automatically transmit identification signals to the central station upon being acti... | 08/02/1977 |
| 3991412 | Multi-subscriber alarm system with central receiving and transmitting installation An alarm system for a number of individual subscribers connected to a central installation in which each subscriber can signal the central installation when help is needed and the central installation can signal back to the subscriber indicating receipt o... | 11/09/1976 |
