Patents by Inventor Nathaniel E. Welch

Nathaniel E. Welch 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).

  • Method and apparatus for refreshing carbon in a carbon filter canister
    Patent number: 7942954
    Abstract: Method and apparatus for refreshing carbon in a carbon filter system, preferably involving a plurality of canisters, wherein spent carbon is dumped from a filtering canister into a spent carbon container.
    Type: Grant
    Filed: October 15, 2008
    Date of Patent: May 17, 2011
    Inventor: Nathaniel E. Welch
  • Method and apparatus for refreshing carbon in a carbon filter canister
    Publication number: 20090145298
    Abstract: Method and apparatus for refreshing carbon in a carbon filter system, preferably involving a plurality of canisters, wherein spent carbon is dumped from a filtering canister into a spent carbon container.
    Type: Application
    Filed: October 15, 2008
    Publication date: June 11, 2009
    Inventor: Nathaniel E. Welch