Patents by Inventor Daniel Franklin Harnish

Daniel Franklin Harnish 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).

  • Multiple solvent cleaning system
    Patent number: 6355113
    Abstract: A non-aqueous cleaning process uses an organic solvent for removing soil or surface contamination from contaminated articles such as printed circuit boards which are cleaned by immersion into a sump compartment of a cleaning tank containing the organic cleaning solvent. The organic solvent is preferably a hydrocarbon solvent. The cleaned articles, now coated with the organic cleaning solvent, are then disposed in a rinsing sump containing a fluorocarbon based rinsing solvent having an affinity for the organic cleaning solvent. The organic solvent is thus removed from the articles which are then dried without waste water as in a conventional solvent vapor degreasing solvent process.
    Type: Grant
    Filed: November 6, 1998
    Date of Patent: March 12, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: David Nalewajek, Rajat Subhra Basu, David Paul Wilson, Michael Van Der Puy, Ellen Louise Swan, Peter Brian Logsdon, Gary J. Zyhowski, Hepburn Ingham, Daniel Franklin Harnish, Joel Edward Rodgers