Patents by Inventor Petrus W. H. L. Tjan

Petrus W. H. L. Tjan 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 preparation of gas oil
    Patent number: 4201659
    Abstract: A process is disclosed for the conversion of asphaltines-containing mineral hydrocarbon oil to distillate gas oil by a processing sequence comprising thermal cracking, flashing, atmospheric fractionation, vacuum fractionation, thermal cracking, catalytic cracking or hydrocracking, and atmospheric fractionation with certain recycle of intermediate streams to achieve efficient, economic operations.
    Type: Grant
    Filed: May 29, 1979
    Date of Patent: May 6, 1980
    Assignee: Shell Oil Company
    Inventors: Pieter B. Kwant, Dirk Kanbier, Petrus W. H. L. Tjan, Mohammed Akbar
  • Process for the preparation of gas oil
    Patent number: 4200519
    Abstract: A process for the preparation of gas oil from residual oils by combination of two stages of thermal cracking, cyclone separation, vacuum distillation, deasphalting, atmospheric distillation, and recycling of certain streams.
    Type: Grant
    Filed: May 29, 1979
    Date of Patent: April 29, 1980
    Assignee: Shell Oil Company
    Inventors: Pieter B. Kwant, Dirk Kanbier, Petrus W. H. L. Tjan, Mohammed Akbar