Patents by Inventor David C. Williams

David C. Williams 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).

  • Freeze-drying process
    Patent number: 4001944
    Abstract: A process is provided for freeze-drying an aqueous liquid product which comprises distributing the liquid product in containers closely fitted in cavities of a tray-shaped heat-conducting solid metal block having relatively high heat transfer, subjecting the block to accelerated cooling such that the liquid in each container is frozen thereby freezing the liquid in each container at substantially the same rate, and drying the frozen product under vacuum while in the block so that the frozen product in each container is dried at substantially the same rate.
    Type: Grant
    Filed: August 25, 1975
    Date of Patent: January 11, 1977
    Assignee: Parke, Davis & Company
    Inventor: David C. Williams