Patents by Inventor David W. Blowers

David W. Blowers 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).

  • Treatment of contaminated agricultural run-off
    Patent number: 5330651
    Abstract: Nitrate-polluted run-off water from a field is conveyed via land drains to a reservoir. The reservoir is large enough to contain excess quantities of storm water from the field. From the reservoir, the run-off water enters a tank which contains wood or other organic carbon material. The wood is kept under water, i.e. under anaerobic conditions, whereby the nitrate is broken down by bio-chemical action. Sufficient wood is provided, and the flow rate is so adjusted, that the nitrate-polluted water spends many hours in contact with the wood.
    Type: Grant
    Filed: May 8, 1992
    Date of Patent: July 19, 1994
    Assignee: University of Waterloo
    Inventors: William Robertson, David W. Blowers, Carol J. Ptacek