Patents by Inventor Frank T. Hoffman

Frank T. Hoffman 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).

  • Portable Flexible and Extendable Drain Pipe
    Publication number: 20100170589
    Abstract: A flexible collapsible corrugated drain pipe has a corrugation structure that permits a tight bending radius and relatively facile collapsing and expansion of corrugations, thereby permitting convenient manipulation and installation of drain pipe and packaging, display, storage and transportation of the collapsed pipe sections.
    Type: Application
    Filed: March 16, 2010
    Publication date: July 8, 2010
    Inventors: E. Michael Boettner, Billy J. Hall, Frank T. Hoffman
  • Portable flexible and extendable drain pipe
    Patent number: 7677271
    Abstract: A flexible collapsible corrugated drain pipe has a corrugation structure that permits a tight bending radius and relatively facile collapsing and expansion of corrugations, thereby permitting convenient manipulation and installation of drain pipe and packaging, display, storage and transportation of the collapsed pipe sections.
    Type: Grant
    Filed: June 2, 2006
    Date of Patent: March 16, 2010
    Assignee: Cleveland Tubing Inc.
    Inventors: E. Michael Boettner, Billy J. Hall, Frank T. Hoffman