Patents by Inventor John D. Alt

John D. Alt 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).

  • Patent number: 7082879
    Abstract: The invention is a method of coordinating the movement of a plurality of oppositely directed tramcars operating along a single guidelane. This includes positioning a plurality of fixed stop-boarding areas along the guidelane. By-pass lanes enabling oppositely moving tramcars to pass each other are located in association with at least some of the stop-boarding areas. A predetermined arrival time for each tramcar at each stop-boarding area is calculated such that oppositely moving pairs of tramcars approaching a common stop-boarding area will arrive at approximately the same time. A processor onboard each tramcar calculates the distance and time remaining to the next stop-boarding area. With a known time and distance remaining to the next stop-boarding area, each on-board processor adjusts the speed of the tramcar such that it arrives at approximately the predetermined arrival time.
    Type: Grant
    Filed: June 14, 2004
    Date of Patent: August 1, 2006
    Inventor: John D. Alt
  • Patent number: 5611282
    Abstract: The method and apparatus includes a single dedicated lane, multiple trams moving in both directions along the dedicated lane, multiple tram stop-boarding areas, each with an associated by-pass lane, disposed at intervals along the dedicated lane, a terrestrial guide which guides bidirectional steering assemble associated with the steerable wheels of the trams, and sensor and communication devices which coordinate the movement of the trams. The multiple trams are disposed along the route so there is always an odd number of tram stop-boarding areas between oppositely moving trams such that, as they approach each other, they can be coordinated to meet, without having to stop or wait, at a common tram stop-boarding area at substantially the same moment, the associated by-pass lane at each boarding area allowing the trams to then pass each other after passengers have disembarked and embarked.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: March 18, 1997
    Inventor: John D. Alt