Patents by Inventor Lawrence R. Hagner

Lawrence R. Hagner 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 for electrical assembly cleaning using a non-azeotropic solvent composition
    Patent number: 5482563
    Abstract: A distillable, non-azeotropic solvent mixture for electronic assembly cleaning in order to adequately remove solder flux and other residues traditionally removed using CFC-based azeotropes. The mixture is heated to at least the boiling point of component A but less than the boiling point of component B. Component A vaporizes (102), forming a vapor layer above the mixture (103). Condensing elements (101) near the top of the cleaning apparatus condense the vapor (102), returning it to the heated mixture (103) to be vaporized again. The assembly (104) to be cleaned is lowered through the vapor and then immersed in the mixture (103) before being positioned in the vapor (102).
    Type: Grant
    Filed: November 10, 1994
    Date of Patent: January 9, 1996
    Assignee: Motorola, Inc.
    Inventors: Robert C. Pfahl, Jr., James A. Wrezel, Lawrence R. Hagner
  • Non-azeotropic solvent composition for cleaning and defluxing electrical assemblies
    Patent number: 5395548
    Abstract: A distillable, non-azeotropic solvent mixture for electronic assembly cleaning in order to adequately remove solder flux and other residues traditionally removed using CFC-based azeotropes. The mixture is heated to at least the boiling point of component A but less than the boiling point of component B. Component A vaporizes (102), forming a vapor layer above the mixture (103). Condensing elements (101) near the top of the cleaning apparatus condense the vapor (102), returning it to the heated mixture (103) to be vaporized again. The assembly (104) to be cleaned is lowered through the vapor and then immersed in the mixture (103) before being positioned in the vapor (102).
    Type: Grant
    Filed: April 6, 1993
    Date of Patent: March 7, 1995
    Assignee: Motorola, Inc.
    Inventors: Robert C. Pfahl, Jr., James A. Wrezel, Lawrence R. Hagner
  • Vapor containment apparatus
    Patent number: 5220936
    Abstract: The apparatus of the present invention uses a vessel with a sump for containing a liquid (103). The vessel has one or more downward angled openings (101). A heating device (104) boils the liquid to produce a vapor and a condensing apparatus (102), in the opening or in a separate chamber, prevents any vapor from exiting the apparatus. The apparatus contains a condensable liquid having a vapor density less than that of the ambient atmosphere by producing a stably stratified interface between the condensable vapor and the ambient atmosphere. The apparatus can be used for such manufacturing processes as cleaning or coating with vapors that are less dense than air.
    Type: Grant
    Filed: February 3, 1992
    Date of Patent: June 22, 1993
    Assignee: Motorola, Inc.
    Inventors: Robert C. Pfahl, Jr., Lawrence R. Hagner, James A. Wrezel