Patents by Inventor Chuka H. Ejiofor

Chuka H. Ejiofor 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).

  • Halohydrocarbon sensing chemistry with base modifier
    Patent number: 5457056
    Abstract: A base modifier is added to a pyridine/base reagent composition to improve the ability to detect halogenated hydrocarbons like TCE and chloroform. The base modifier is an organic base which facilitates formation of a stable final reaction product. New bases are also combined with pyridine.
    Type: Grant
    Filed: July 6, 1993
    Date of Patent: October 10, 1995
    Assignee: FiberChem, Inc.
    Inventors: Dileep K. Dandge, Kishology Goswami, Stanley M. Klainer, Chuka H. Ejiofor
  • Solid state sensor for carbon monoxide
    Patent number: 5405583
    Abstract: A solid state optical sensor for CO has a sensing material which includes a molybdenum, tungsten or vanadium color forming agent; a palladium, ruthenium or osmium catalyst; and an iron, chromium or cesium reversing agent. A redox property modifier and/or an interference suppressing agent may also be included. The chemistry is contained in a polymer embedding matrix, with permeation enhancer, if required. Solubility of the chemistry in the polymer matrix is enhanced by lipophilic counterions. The matrix with embedded sensing chemistry is coated on an optical substrate to form an optical transducer.
    Type: Grant
    Filed: February 25, 1993
    Date of Patent: April 11, 1995
    Assignee: FCI - FiberChem, Inc.
    Inventors: Kisholoy Goswami, Devinder P. S. Saini, Stanley M. Klainer, Chuka H. Ejiofor
  • Method and composition for halohydrocarbon detection
    Patent number: 5358875
    Abstract: A sensing chemistry for halogenated hydrocarbons includes pyridine or a pyridine derivative and a strong organic alkoxide base. The sensing chemistry may be in a nonaqueous organic solvent or in a solid state matrix. The base reacts with the halohydrocarbon to produce a carbene intermediate reaction product, which in the absence of water preferentially reacts with the pyridine to form a colored and/or fluorescent product.
    Type: Grant
    Filed: June 25, 1993
    Date of Patent: October 25, 1994
    Assignee: FIC - FiberChem, Inc.
    Inventors: Kisholoy Goswami, Dileep K. Dandge, Stanley M. Klainer, Chuka H. Ejiofor
  • Specific and reversible carbon monoxide sensor
    Patent number: 5346671
    Abstract: A molybdenum, tungsten or vanadium salt-palladium, ruthenium or osmium salt solution for CO detection is made reversible by addition of ferric, chromium (VI) or cerium (IV) ion. The system is made more CO specific by adding an interference control salt which forms white or colorless precipitates with interfering species. The operational and shelf life are extended by a mixture of counterions; the acetate counterion is particularly useful.
    Type: Grant
    Filed: February 25, 1993
    Date of Patent: September 13, 1994
    Assignee: FCI - FiberChem, Inc.
    Inventors: Kisholoy Goswami, Devinder P. S. Saini, Stanley M. Klainer, Chuka H. Ejiofor
  • Specific and reversible carbon monoxide sensor
    Patent number: 5302350
    Abstract: A molybdenum salt-palladium salt solution for CO detection is made reversible by addition of ferric ion. The system is made more CO specific by adding an interference control salt which forms white or colorless precipitates with interfering species. The operational and shelf life are extended by a mixture of counterions; the acetate counterion is particularly useful.
    Type: Grant
    Filed: January 26, 1993
    Date of Patent: April 12, 1994
    Assignee: FCI - FiberChem, Inc.
    Inventors: Kisholoy Goswami, Devinder P. S. Saini, Stanley M. Klainer, Chuka H. Ejiofor