Patents by Inventor William Patrick Ryan

William Patrick Ryan 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).

  • Method of preparing tobacco smoke filter
    Patent number: 3966912
    Abstract: A tobacco smoke filter element for use in cigarettes, cigarette holders, cigar holders or pipes is formed from a bonded non-woven fabric composed wholly or partly of wool fibers. It is preferred that the content of wool fibers shall be as high as is economically feasible. It is preferred that in the case of a filter for a cigarette the filter is made by converting a web of bonded non-woven fabric to a filter rod of substantially circular cross-section.
    Type: Grant
    Filed: August 1, 1975
    Date of Patent: June 29, 1976
    Assignees: Rothmans of Pall Mall (Australia) Limited, Lantor of Australia Pty. Ltd.
    Inventors: Graeme David Fair, Derek Lesley Arthur Hasmall, William Patrick Ryan, Edwin John Sellman