Patents by Inventor Denis Pettigrew

Denis Pettigrew 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).

  • Tertiary system and process for treating a liquid effluent from an onsite domestic secondary treatment unit
    Patent number: 7790035
    Abstract: Described are a tertiary disinfection system and process for treating a liquid effluent from a domestic secondary treatment unit. The liquid effluent has pathogenic micro-organisms, remaining suspended solids and dissolved organic pollutants. The system has an inlet, a subterranean initial treatment zone filled with a filtering material for removing some suspended solids, dissolved organic pollutants and pathogenic micro-organisms. The initial treatment zone allows the liquid effluent to percolate downward. The system also has a subterranean polishing zone extending horizontally outward from the initial treatment zone, and filled with a filtering material having pore sizes allowing upward capillary dispersion of the liquid effluent. The system also has a subterranean aeration zone having an interface with the initial treatment zone and the polishing zone, to provide aeration enabling aerobic accommodation of microflora for disinfection of the effluent.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: September 7, 2010
    Assignee: Premier Tech Technologies LTEE
    Inventors: Jean-Pierre Dautais, Roger Lacasse, Denis Pettigrew, Pierre Talbot
  • TERTIARY SYSTEM AND PROCESS FOR TREATING A LIQUID EFFLUENT FROM AN ONSITE DOMESTIC SECONDARY TREATMENT UNIT
    Publication number: 20090230057
    Abstract: Described are a tertiary disinfection system and process for treating a liquid effluent from a domestic secondary treatment unit. The liquid effluent has pathogenic micro-organisms, remaining suspended solids and dissolved organic pollutants. The system has an inlet, a subterranean initial treatment zone filled with a filtering material for removing some suspended solids, dissolved organic pollutants and pathogenic micro-organisms. The initial treatment zone allows the liquid effluent to percolate downward. The system also has a subterranean polishing zone extending horizontally outward from the initial treatment zone, and filled with a filtering material having pore sizes allowing upward capillary dispersion of the liquid effluent. The system also has a subterranean aeration zone having an interface with the initial treatment zone and the polishing zone, to provide aeration enabling aerobic accommodation of microflora for disinfection of the effluent.
    Type: Application
    Filed: March 13, 2008
    Publication date: September 17, 2009
    Applicant: PREMIER TECH TECHNOLOGIES LTEE
    Inventors: Jean-Pierre Dautais, Roger Lacasse, Denis Pettigrew, Pierre Talbot
  • Coconut mesocarp-based biofilter material and its use in a wastewater treatment system
    Patent number: 7097768
    Abstract: A biofilter material for biofiltering a fluid is disclosed. This biofilter material comprises fragments of coconut mesocarp. A wastewater treatment system is also disclosed and comprises a filter bed and a water distribution system. The filter bed comprises fragments of coconut mesocarp as a biofilter material.
    Type: Grant
    Filed: September 22, 2003
    Date of Patent: August 29, 2006
    Assignee: Premier Tech 2000 LTEE
    Inventors: Pierre Talbot, Denis Pettigrew, Roger Lacasse, Ginette Bélanger, Yves Arcand, Jean-Pierre Dautais
  • Coconut mesocarp-based biofilter material and its use in a wastewater treatment system
    Publication number: 20040124139
    Abstract: A biofilter material for biofiltering a fluid is disclosed. This biofilter material comprises fragments of coconut mesocarp. A wastewater treatment system is also disclosed and comprises a filter bed and a water distribution system. The filter bed comprises fragments of coconut mesocarp as a biofilter material.
    Type: Application
    Filed: September 22, 2003
    Publication date: July 1, 2004
    Inventors: Pierre Talbot, Denis Pettigrew, Roger Lacasse, Ginette Belanger, Yves Arcand, Jean-Pierre Dautais