Patents by Inventor David M. McEwen

David M. McEwen 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).

  • Navigational calculating device
    Patent number: 4347669
    Abstract: This disclosure relates to a new navigational calculating device which provides a mechanical means of solving position finding problems by solving a plane right triangle. It is an alternative to traverse tables, trigonometric formulas, and chart plotting for determining a dead reckoning position. It is particularly useful for small water-going craft in which conventional methods of navigation are difficult or impractical. A plotting board may be used to provide a visual application of calculation results.
    Type: Grant
    Filed: June 19, 1980
    Date of Patent: September 7, 1982
    Inventor: David M. McEwen
  • Navigational calculating device
    Patent number: 4208805
    Abstract: This disclosure relates to a new navigational calculating device which provides a mechanical means of solving position finding problems by solving a plane right triangle. It is an alternative to traverse tables, trigonometric formulas, and chart plotting for determining a dead reckoning position. It is particularly useful for small water-going craft in which conventional methods of navigation are difficult or impractical.
    Type: Grant
    Filed: June 25, 1979
    Date of Patent: June 24, 1980
    Inventor: David M. McEwen