Patents by Inventor Chang-Hwa Chin

Chang-Hwa Chin 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).

  • Process for the destruction of by-product tetranitromethane
    Patent number: 4713232
    Abstract: A process for the management of by-product tetranitromethane (TNM) which avoids the hazards of the prior art isolation or extraction procedures. A selected in-plant liquid or vapor stream, or a reactor off-gas stream from nitration or nitric acid oxidation plant, which contains TNM, is heated to effectively pyrolyze the TNM without undue losses of nitric acid values.
    Type: Grant
    Filed: August 13, 1986
    Date of Patent: December 15, 1987
    Assignee: C-I-L Inc.
    Inventors: Chang-Hwa Chin, Anthony C. F. Edmonds, Colin M. Evans
  • Continuous method and apparatus for the preparation of explosives emulsion precursor
    Patent number: 4472215
    Abstract: A process and apparatus is provided for the continuous manufacture of a water-in-oil explosive emulsion precursor. Separate streams of the water phase component and the oil phase component are introduced into an in-line motionless mixer. A chosen portion of the output from the mixer is recirculated and returned to the motionless mixer for further emulsification. The process allows for the production of a very high phase ratio water-to-oil emulsion (up to 95% water phase) without phase inversion after long storage. The precursor is simply converted to a sensitive explosive by means of known density lowering techniques.
    Type: Grant
    Filed: March 24, 1983
    Date of Patent: September 18, 1984
    Assignee: C-I-L Inc.
    Inventors: Rejean Binet, Chang-Hwa Chin, Anthony C. F. Edmonds, Ming C. Lee, Roland Picard