Patents by Inventor Richard D. Crawford

Richard D. Crawford has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7834228
    Abstract: Synthesis of mono-substituted alkylcyclopentadienes by mixing alkyl iodides with cyclopentadienyl magnesium chloride in tetrahydrofuran is described.
    Type: Grant
    Filed: June 16, 2006
    Date of Patent: November 16, 2010
    Assignee: Boulder Scientific Company
    Inventors: Karin A. Voll Barclay, Richard D. Crawford, Dawn A. Arkin, Daniel A. Gately
  • Patent number: 6496549
    Abstract: An approved demodulator is disclosed for demodulating optical ASK data signals whose data bits are each characterized by either an absence of pulses or a burst of pulses at a predetermined frequency. The demodulator includes an amplifier tuned to this predetermined frequency, and it further includes an edge detector that produces an envelope of the amplified signal. A comparator then compares the envelope signal with a prescribed threshold, to produce a pulse signal for each received burst of pulses. The duration of this pulse signal is then stretched so as to correspond to the pulse burst's expected nominal duration. The demodulator is specially configured such that it can properly demodulate ASK data signals having power levels that vary over a range of several orders of magnitude.
    Type: Grant
    Filed: July 13, 1999
    Date of Patent: December 17, 2002
    Assignee: Hewlett-Packard Company
    Inventor: Richard D. Crawford
  • Patent number: 6388151
    Abstract: A method for synthesizing tetramethylcyclopentadiene from 2,3-dibromobutane is described. A 2-bromo-2-butene Grignard is reacted with an ethyl formate to produce a 3,5-dimethyl-2,5-heptadiene-4-ol magnesium bromide which is then quenched with acetic acid to produce 3,5-dimethyl-2,5-hepadiene-4-ol.
    Type: Grant
    Filed: November 24, 1998
    Date of Patent: May 14, 2002
    Assignee: Boulder Scientific Company
    Inventors: Jeffrey M. Sullivan, Richard D. Crawford
  • Patent number: 6175027
    Abstract: A method for producing an alkyl cyclopentadiene by reacting cyclopentadienyl Grignard with an alkyl halide and for converting the alkyl cyclopentadiene to a bis(n-alkyl cyclopentadienyl) Group IV metal dihalide is described.
    Type: Grant
    Filed: August 13, 1999
    Date of Patent: January 16, 2001
    Assignee: Boulder Scientific Company
    Inventors: Jeffrey M. Sullivan, Richard D. Crawford, Albert A. Hummel
  • Patent number: 5495358
    Abstract: An IR transceiver for use in low-power, low cost environments such as portable computers and hand-held calculators. The transceiver can transmit data at higher, selectable baud rates and at greater distances than previously possible. On the transmitting side the transceiver elements include a serial interface device, encoder circuitry and an IR transmitter with LEDS having fast turn-on and turn-off times. On the receiving side are decoder circuitry coupled to the serial interface device and an IR receiver designed specifically for a photo diode. A baud rate generator provided by the serial interface device sets the baud rate in the encoding and decoding circuitry. The receiver portion of the IR transceiver automatically sets itself to the baud rate of received data. Because of the baud rate selectability, the IR transceiver is compatible with prior IR transceivers that are limited to fixed baud rates.
    Type: Grant
    Filed: November 23, 1992
    Date of Patent: February 27, 1996
    Assignee: Hewlett-Packard Company
    Inventors: Kevin W. Bartig, Richard D. Crawford