Patents by Inventor Zadson d. Franco

Zadson d. Franco 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 thermo-chemical cleaning of storage tanks
    Patent number: 5580391
    Abstract: A process for the thermo-chemical cleaning of storage tanks which contain sludges from petroleum oil or related products. The process is carried out by the combined action of an organic solvent and the generation of nitrogen gas and heat, whereby produced heating in situ, agitation by turbulence and flotation of the fluidized sludge, which after being collected and transferred to tanks or desalting units can be reintroduced in the usual refining flow.
    Type: Grant
    Filed: October 13, 1994
    Date of Patent: December 3, 1996
    Assignee: Petroleo Brasileiro S.A. - Petrobras
    Inventors: Zadson d. Franco, Carlos N. Khalil, Oswaldo d. Pereira, Jr.
  • Mechanical system for diversion in the acidizing treatment of oil formations
    Patent number: 4881599
    Abstract: The invention concerns a mechanical system which permits the use of ball sealers as diversion agents in the acidizing of productive hydrocarbon formations, by associating the advantages of mechanical diversion to the advantages of the use of ball sealers, whatever their density.The mechanical system comprises a packer (7), a swivel (18), a centralized tail (9), a ball ejection port (10) and two cups (11).The mechanical system operation involves the adequate positioning of each of its components in such a manner as to permit the ball sealers to attain sufficient velocities to be driven mechanically to their targets.
    Type: Grant
    Filed: March 29, 1988
    Date of Patent: November 21, 1989
    Assignee: Petroleo Brasileiro S.A. - Petrobras
    Inventors: Zadson d. A. Franco, Demostenis A. W. Barreto