Patents by Inventor Octavia Lehar

Octavia Lehar 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).

  • Use of mixtures of ethyl lactate and N-methyl pyrollidone as an edge bead remover for photoresists
    Patent number: 5814433
    Abstract: The invention provides a process for removing unwanted photoresist material from the periphery of a photoresist-coated substrate using a solvent composition of ethyl lactate and N-methyl pyrollidone, where the amount of N-methyl pyrollidone ranges from about 3% to about 20% by weight of the total composition, and where the solvent composition has a flash point of greater than 100.degree. F. (38.degree. C.), has an odor threshold value greater than 5000, is effective as both a backside and topside edge bead remover and can effectively remove the edge bead from an unbaked or baked photoresist film.
    Type: Grant
    Filed: April 3, 1997
    Date of Patent: September 29, 1998
    Assignee: Clariant Finance (BVI) Limited
    Inventors: William C. Nelson, Octavia Lehar