Patents by Inventor Patrick Eugene Lien

Patrick Eugene Lien 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).

  • Vacuum waste pipe cleaning
    Patent number: 5873944
    Abstract: A method of and system for removing blockage from pipes in vacuum waste systems in which fouled pipes in the existing vacuum waste system are configured into a closed loop. A cleaning solution is added to the loop. The cleaning solution is recirculated through the loop by pumping it to the ends of the fouled pipes and drawing it through the fouled pipes using the existing system vacuum equipment. The vacuum waste system may remain operational during cleaning.
    Type: Grant
    Filed: May 13, 1997
    Date of Patent: February 23, 1999
    Assignee: H.E.R.C. Products Incorporated
    Inventors: Patrick Eugene Lien, Jerome H. Ludwig