Patents by Inventor Margaret Loudon Clachan

Margaret Loudon Clachan 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).

  • Process of making diazo-sensitized film products using halogen containing phenols as coating aid
    Patent number: 4014701
    Abstract: Process of producing diazo-sensitized film products which comprises pretreating the film surface with a halogen containing phenolic substance, coating with a plastics anchor layer and then coating with another plastics layer which includes or is impregnated with a light-sensitive diazonium compound.
    Type: Grant
    Filed: March 22, 1974
    Date of Patent: March 29, 1977
    Assignee: Imperial Chemical Industries Limited
    Inventors: Margaret Loudon Clachan, David Rankine Kennedy, Basil Robert Shephard, deceased, by Doreen Shephard, executrix