Patents by Inventor Herwig J. Janssen

Herwig J. Janssen 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).

  • Preservative for ophthalmic solutions
    Patent number: 5200453
    Abstract: An ophthalmic formulation comprising a salt of sepazonium or a similar imidazolium compound as a preservative is provided.
    Type: Grant
    Filed: September 17, 1990
    Date of Patent: April 6, 1993
    Assignee: Iolab Corporation
    Inventor: Herwig J. Janssen