Patents Assigned to Standard Telephones and Cables Public Limited Company (STC)
  • Controlled release system
    Patent number: 4866097
    Abstract: A device for the controlled release of an active material into an aqueous medium comprises a water soluble capillary tube (11) the bore (12) of which contains an active material (13). Dissolution of the active material is diffusion limited during a delay period while the capillary is dissolving. When dissolution of the tube is complete rapid dissolution of the remaining active material then takes place.
    Type: Grant
    Filed: September 6, 1984
    Date of Patent: September 12, 1989
    Assignee: Standard Telephones and Cables Public Limited Company (STC)
    Inventors: Cyril F. Drake, Alfred J. Arch