Patents by Inventor James P. Stokes

James P. Stokes 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).

  • Amicloamine derivatives of carboxylic and thiocarboxylic-functionalized hydrocarbon polymers
    Patent number: 5672573
    Abstract: Processes for preparing amidoamine products derived from hydrocarbon polymers containing carboxylic acid, thioacid, ester or thioester functional groups are disclosed. More particularly, a process is disclosed which comprises the steps of:(A) reacting (i) a hydrocarbon polymer functionalized to contain functional groups of formula --CO--Y--R.sup.3, the hydrocarbon polymer having a number average molecular weight of at least about 500 prior to functionalization, wherein Y is O or S, R.sup.3 is hydrogen, hydrocarbyl, or substituted hydrocarbyl and wherein at least 50 mole % of the functional groups are attached to a tertiary carbon atom of the polymer, with (ii) a volatile amine containing at least two reactive amino groups under conditions effective to amidate at least a portion of the --CO--Y--R.sup.3 functional groups and form a first amidoamine adduct containing at least one reactive amino group; and(B) reacting the first amidoamine adduct with an .alpha.,.beta.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: September 30, 1997
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Antonio Gutierrez, James P. Stokes
  • Derivatives of polyamines with one primary amine and secondary of tertiary amines
    Patent number: 5643859
    Abstract: A dispersant derivatized from a functionalized hydrocarbon and a polyamine having one primary amine and 1-10, preferably 3-8 secondary or tertiary amines; preferably where said functionalized hydrocarbon is a Koch-derived hydrocarbon.
    Type: Grant
    Filed: June 17, 1994
    Date of Patent: July 1, 1997
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Antonio Gutierrez, Jacob I. Emert, James P. Stokes, Warren A. Thaler, William D. Diana, Keith R. Gorda, William B. Eckstrom, David C. Dankworth, Joseph V. Cusumano
  • Automatic vehicle recognition and customer automobile diagnostic system
    Patent number: 5557268
    Abstract: The present invention is a system and method for identifying a vehicle for the purpose of displaying diagnostic information to the driver. Each vehicle includes a transponder that transmits an encoded character sequence that is unique to that vehicle. In this way vehicle diagnostic measurements made at the establishment entrance can be associated with the vehicle, and displayed to the customer when the vehicle is recognized again at a service area.
    Type: Grant
    Filed: February 24, 1995
    Date of Patent: September 17, 1996
    Assignee: Exxon Research and Engineering Company
    Inventors: Gerard J. Hughes, Leonard J. Duncan, David P. Goshorn, James P. Stokes
  • Frequency modulator and demodulator using material having sliding charge density waves
    Patent number: 4636737
    Abstract: The present invention is a method and a device for the frequency modulation and/or demodulation of a signal applied to materials that carry sliding charge density waves. A particular example of such a material is orthorhombic TaS.sub.3 that acts as a frequency modulator.
    Type: Grant
    Filed: July 8, 1985
    Date of Patent: January 13, 1987
    Assignee: Exxon Research and Engineering Company
    Inventors: Sabyasachi Bhattacharya, Aaron N. Bloch, James P. Stokes
  • Frequency modulator using material having sliding charge density waves
    Patent number: 4580110
    Abstract: The present invention is a method and a device for the frequency modulation and/or demodulation of a signal applied to materials that carry sliding charge density waves. A particular example of such a material is orthorhombic TaS.sub.3 that acts as a frequency modulator.
    Type: Grant
    Filed: July 26, 1984
    Date of Patent: April 1, 1986
    Assignee: Exxon Research and Engineering Co.
    Inventors: Sabyasachi Bhattacharya, Aaron N. Bloch, James P. Stokes