Patents by Inventor Donald B. Hazen

Donald B. Hazen 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).

  • Swivel trailer
    Patent number: 11407263
    Abstract: A swivel trailer is described that can include a swivel hitch and swivel axle configuration which prevents a vehicle and trailer from jackknifing.
    Type: Grant
    Filed: April 20, 2021
    Date of Patent: August 9, 2022
    Inventor: Donald B. Hazen
  • Double-castered wheel trailer having lockable caster wheels
    Patent number: 6626449
    Abstract: A double-castered wheel trailer having a pair of lockable caster wheels. The lockable caster wheels are adapted to be locked for a trailing mode of operation and a backing mode of operation. The double-castered wheel trailer further includes a multi-planar adapting hitch-to-trailer coupler. The multi-planar adapting hitch-to-trailer includes a horizontal pivot member adapted to be secured to a pair of hitch balls and pivot in a horizontal plane about the towing vehicle. Further included is a vertical swivel member coupled to the horizontal pivot member and the trailer frame to independently rotate the trailer frame about said horizontal pivot member.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: September 30, 2003
    Inventor: Donald B. Hazen
  • Double-castered wheel trailer having lockable caster wheels
    Publication number: 20020109333
    Abstract: A double-castered wheel trailer having a pair of lockable caster wheels. The lockable caster wheels are adapted to be locked for a trailing mode of operation and a backing mode of operation. The double-castered wheel trailer further includes a multi-planar adapting hitch-to-trailer coupler. The multi-planar adapting hitch-to-trailer includes a horizontal pivot member adapted to be secured to a pair of hitch balls and pivot in a horizontal plane about the towing vehicle. Further included is a vertical swivel member coupled to the horizontal pivot member and the trailer frame to independently rotate the trailer frame about said horizontal pivot member.
    Type: Application
    Filed: February 9, 2001
    Publication date: August 15, 2002
    Inventor: Donald B. Hazen
  • Universal single-wheel single beam trailer having adjustable bed
    Patent number: 5368325
    Abstract: A trailer for towing by an automotive type vehicle includes a single longitudinal beam. A plurality of adjustable transverse cradle support members are mounted along the beam. A single castered wheel is mounted near the back end of the beam. A hitch for attachment to a towing vehicle at the front end of the beam maintains the beam aligned with a longitudinal axis of the towing vehicle. Various types of loads may be accommodated by attaching appropriate type cradles to the cradle support members, and the spacing of support members may be adjusted to accept the load.
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: November 29, 1994
    Inventor: Donald B. Hazen