Patents by Inventor David J. Leggett

David J. Leggett 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).

  • SMS communication during emergencies
    Patent number: 9301117
    Abstract: Systems and methods provide, to emergency operators at an emergency call center, the ability to communicate through textual messages with wireless mobile devices from which emergency voice calls have been placed. By virtue of such textual communication, callers using wireless mobile devices can receive emergency instructions and/or provide information about their current location.
    Type: Grant
    Filed: August 21, 2013
    Date of Patent: March 29, 2016
    Assignee: TRITECH SOFTWARE SYSTEMS
    Inventors: David J. Leggett, Christopher David Maloney, Scott Michael MacDonald, Mark David Hamilton, Erik Christian Loberg, Chen-Lu Meng, Ken D. Martin
  • SMS COMMUNICATION DURING EMERGENCIES
    Publication number: 20150056946
    Abstract: Systems and methods provide, to emergency operators at an emergency call center, the ability to communicate through textual messages with wireless mobile devices from which emergency voice calls have been placed. By virtue of such textual communication, callers using wireless mobile devices can receive emergency instructions and/or provide information about their current location.
    Type: Application
    Filed: August 21, 2013
    Publication date: February 26, 2015
    Applicant: TRITECH SOFTWARE SYSTEMS
    Inventors: David J. Leggett, Christopher David Maloney, Scott Michael MacDonald, Mark David Hamilton, Erik Christian Loberg, Chen-Lu Meng, Ken D. Martin
  • Recovery of metals from solutions containing chelants
    Patent number: 4846978
    Abstract: Metal chelates in solution are decomposed more effectively and completely by ozonation when magnesium hydroxide is added to the chelate solution prior to ozonation. The process is particularly applicable to waste streams from which it is desired to recover metals to avoid contamination of the environment and/or reuse them.
    Type: Grant
    Filed: November 16, 1988
    Date of Patent: July 11, 1989
    Assignee: The Dow Chemical Company
    Inventors: David J. Leggett, Joel G. Courtwright