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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 |
| 7628248 | Apparatus and method for generating a seismic source signal A seismic source signal generator includes a mass, a primary accumulator and a secondary accumulator, the secondary accumulator having an internal volume smaller than an internal volume of the primary accumulator. A method for generating a signal using a seismic vib... | 12/08/2009 |
| 7518954 | Motion transducer A motion sensing transducer is disclosed that includes a case having an inner surface, a first cap that closes the case at a first end and a second cap that closes the case at a second end. The case inner surface, first cap and second cap define a space within the c... | 04/14/2009 |
| 7505369 | Geophone with mass position sensing A motion sensing element with position sensing includes a case, a magnet positioned within the case, a spring assembly having an electrically conductive member and a coil assembly coupled to the spring assembly. The coil assembly and magnet are moveable with respect... | 03/17/2009 |
| 7292943 | System and method for control of seismic data acquisition The present invention provides an interactive system for controlling seismic data acquisition. A central controller controls seismic sources, detectors and receivers. A user/operator is provided one or more views of the operational components over a graphical user i... | 11/06/2007 |
| 7274079 | Sensor design and process An accelerometer (305) for measuring seismic data. The accelerometer (305) includes an integrated vent hole for use during a vacuum sealing process and a balanced metal pattern for reducing cap wafer bowing. The accelerometer (305) also includes... | 09/25/2007 |
| 7236279 | Digital optical switch apparatus and process for manufacturing same The present invention provides a digital optical switch apparatus and process for manufacturing the apparatus. The apparatus includes a mirror assembly coupled to a top cap and to a bottom cap. The top and bottom caps each include one or more electrodes that, when e... | 06/26/2007 |
| 7223962 | Digital optical signal transmission in a seismic sensor array The invention describes a sensor array with digital signals transmitted over an optical fiber for seismic exploration systems. The seismic system includes a transducer for providing digital optical data signals and an optical interrogator for collecting the digital ... | 05/29/2007 |
| 7218890 | Seismic telemetry system A system for remotely controlling, acquiring and monitoring the acquisition of seismic data. The system includes remote equipment for collecting seismic data and for transmitting and receiving communication signals to and from a remote location. The system also incl... | 05/15/2007 |
| 7176589 | Electrical power distribution and communication system for an underwater cable An underwater cable arrangement includes systems and method for distributing and/or transferring power and/or data to internal devices and external devices disposed along an underwater cable. Under water coupling systems and underwater electrical devices may be used... | 02/13/2007 |
