Patents by Inventor John B. Holt

John B. Holt 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: 4998945
    Abstract: Transplanting equipment comprises a line of individual plant pick-up devices, first support means for transversely moving a first row of containers into vertical alignment with the pick-up devices, control means for bringing the pick-up devices into a plant-supporting or plant-releasing mode as appropriate, horizontal drive means operative to bring the pick-up devices into vertical alignment with the containers of a second row having a different center-to-center spacing to the containers of the first row, second support means for transversely moving the second row of containers out of vertical alignment with the pick-up devices, and vertical drive means for moving the pick-up devices towards or away from the first and second support means to allow the support or release of plants by the pick-up devices as determined by the control means.
    Type: Grant
    Filed: December 7, 1989
    Date of Patent: March 12, 1991
    Assignee: National Research Development Corporation
    Inventors: John B. Holt, Simon J. Miles, Arthur L. Wilkin
  • Patent number: 4229347
    Abstract: A liquid diphenylmethane diisocyanate composition which comprises diphenylmethane diisocyanate in which from 10 to 35% of the isocyanate groups have been reacted with a mixture of alkylene glycols each containing at least three carbon atoms, one of the glycols being dipropylene glycol, tripropylene glycol or a higher propylene glycol. The composition is made by heating together the reactants.
    Type: Grant
    Filed: March 28, 1979
    Date of Patent: October 21, 1980
    Assignee: Imperial Chemical Industries Limited
    Inventors: John B. Holt, Arthur Ibbotson