Patents by Inventor John Hamnett

John Hamnett 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).

  • Passive gravity-balanced assistive device for sit-to-stand tasks
    Patent number: 7601104
    Abstract: A passive gravity balancing assist device for human sit-to-stand motion is provided. The design combines the use of auxiliary parallelograms with springs to produce an orthotic device wherein the total potential energy of the system is constant during standing and sitting motion.
    Type: Grant
    Filed: April 21, 2006
    Date of Patent: October 13, 2009
    Assignee: University of Delaware
    Inventors: Sunil Agrawal, Abbas Fattah, Glenn Catlin, John Hamnett
  • Passive gravity-balanced assistive device for sit-to-stand tasks
    Publication number: 20060260621
    Abstract: A passive gravity balancing assist device for human sit-to-stand motion is provided. The design combines the use of auxiliary parallelograms with springs to produce an orthotic device wherein the total potential energy of the system is constant during standing and sitting motion.
    Type: Application
    Filed: April 21, 2006
    Publication date: November 23, 2006
    Inventors: Sunil Agrawal, Abbas Fattah, Glenn Catlin, John Hamnett