Patents by Inventor James A. Wrezel

James A. Wrezel 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).

  • 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
  • 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
  • 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
  • Patent number: 4900794
    Abstract: Thermosetting resins which are essentially vinylbenzyl end-capped ethers of the oligomeric condensation products of certain dihydric phenols and formaldehyde are readily polymerized to give an extensively cross-linked polymer particularly useful in printed circuit boards and similar laminates. Effective cost reduction may be enjoyed by replacing up to 50% of the vinylbenzyl moieties by other groups, such as alkyl and benzyl groups, without destroying the usefulness of the resulting thermosetting resins. The vinylbenzyl ether product from bisphenol-A is especially recommended.
    Type: Grant
    Filed: June 21, 1989
    Date of Patent: February 13, 1990
    Assignee: Allied-Signal Inc.
    Inventors: Joseph J. Zupancic, Andrew M. Zweig, James A. Wrezel
  • Patent number: 4873302
    Abstract: Styrene-terminated polyethers of polyphenols may be used as components in a laminate when coated on a reinforcement or substrate. The poly(vinyl benzyl ether) may be prepared by reacting a bisphenol with an alpha,omega-diahlosubstituted alkane and thereafter reacting the resultant product with vinyl benzyl chloride. The laminates which are prepared from these compounds may be employed in electric or electronic circuit boards and will possess desirable electrical and thermal properties as exemplified by a moderate-to-high glass transition temperature and a low dielectric constant.
    Type: Grant
    Filed: August 29, 1988
    Date of Patent: October 10, 1989
    Assignee: Allied-Signal Inc.
    Inventors: Allyson Beuhler, James A. Wrezel
  • Patent number: 4870138
    Abstract: Novel compositions of matter comprising semi-interpenetrating polymer networks resulting from the reaction between a poly(vinyl benzyl ether) of a polyphenol and engineering condensation thermoplastic may be used as components in a laminate when coated on a reinforcement or substrate. The resulting laminates which may be employed in electric circuit boards will possess desirable electrical and thermal properties as exemplified by a high glass transition temperature and a low dielectric constant.
    Type: Grant
    Filed: April 16, 1986
    Date of Patent: September 26, 1989
    Assignee: Allied-Signal Inc.
    Inventor: James A. Wrezel
  • Patent number: 4855375
    Abstract: Thermosetting resins which are essentially vinylbenzyl end-capped ethers of the oligomeric condensation products of certain dihydric phenols and formaldehyde are readily polymerized to give an extensively cross-linked polymer particularly useful in printed circuit boards and similar laminates. Effective cost reduction may be enjoyed by replacing up to 50% of the vinylbenzyl moieties by other groups, such as alkyl and benzyl groups, without destroying the usefulness of the resulting thermosetting resins. The vinylbenzyl ether product from bisphenol-A is especially recommended.
    Type: Grant
    Filed: November 28, 1988
    Date of Patent: August 8, 1989
    Assignee: Allied-Signal Inc.
    Inventors: Joseph J. Zupancic, Andrew M. Zweig, James A. Wrezel
  • Patent number: 4824920
    Abstract: The resins resulting from converting dicyclopentadiene-phenol adducts to their corresponding vinylbenzyl ethers are an excellent matrix in which to embed fibers to produce a composite. Such resins, especially as a blend of materials with varying molecular weight distribution, are amorphous materials whose glass transition temperature is well under the curing temperature, and whose solubility permits solutions with high solids content so as to afford coatings with high resin content. The extensively crosslinked polymer resulting from therma, photochemical, or free radical initiated polymerization has excellent thermal and electrical properties for use in multilayer circuit boards.
    Type: Grant
    Filed: November 30, 1987
    Date of Patent: April 25, 1989
    Assignee: Allied-Signal Inc.
    Inventors: Joseph J. Zupancic, Jeffrey P. Conrad, James A. Wrezel, Andrew M. Zweig, Jean M. J. Frechet
  • Patent number: 4786700
    Abstract: Homogeneous thermosetting copolymers comprising a mixture of styrene-terminated tetrakisphenols and compounds containing at least one pendant vinyl group as exemplified by styrene-terminated tetrakisphenol ethane and styrene-terminated bisphenol A will possess desirable characteristics such as low dielectric constants and high glass transition temperatures. These polymers may be utilized as a component in laminates or circuit boards which are employed in relatively complicated pieces of electronic equipment.
    Type: Grant
    Filed: December 30, 1986
    Date of Patent: November 22, 1988
    Assignee: Allied-Signal, Inc.
    Inventors: Joseph J. Zupancic, Andrew M. Zweig, James A. Wrezel
  • Patent number: 4777227
    Abstract: High temperature thermosetting resin compositions which may be used as a polymer matrix for a printed circuit board will comprise a terpolymer of an ethylenically monosubstituted unsaturated monomer in which said substituent is an aromatic moiety such as styrene, an ethylenically alpha,beta-disubstituted unsaturated monomer in which each substituent is an aromatic or benzylic moiety such as acenaphthylene and a glycidyl ester of a monoethylenically unsaturated acid such as glycidyl methacrylate cross-linked with a copolymer of an anhydride of a dibasic olefinic acid such as maleic anhydride and an ethylenically monosubstituted unsaturated monomer in which said substituent is an aromatic moiety such as styrene.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: October 11, 1988
    Assignee: Allied Corporation
    Inventors: James A. Wrezel, Allyson J. Beuhler
  • Patent number: 4728708
    Abstract: Thermoset polymers of styrene terminated tetrakis phenols may be prepared from resins which possess the generic formula ##STR1## in which R is selected from the group consisting of alkyl, cycloalkyl, alkaryl and substituted alkaryl radicals and X is independently selected from the group consisting of hydrogen and halogen atoms. These polymers will be utilized as a component in laminates on circuit boards which are employed in relatively complicated pieces of electronic equipment.
    Type: Grant
    Filed: December 29, 1986
    Date of Patent: March 1, 1988
    Assignee: Allied Corporation
    Inventors: Joseph J. Zupancic, Andrew M. Zweig, James A. Wrezel
  • Patent number: 4604438
    Abstract: Novel high temperature thermoset terpolymers may be synthesized by reacting an alpha-substituted olefin, an alpha,beta-disubstituted olefin and a dual function monomer followed by cross-linking the resultant polymer with a low molecular weight multifunctional amine as the cross-linking agent in the presence of a catalyst. The resulting cross-linking agent is then cured at an elevated temperature to provide the desired terpolymer. This compound will possess desirable properties such as a low dielectric constant which renders it applicable for use as circuit board laminates.
    Type: Grant
    Filed: August 12, 1985
    Date of Patent: August 5, 1986
    Assignee: UOP Inc.
    Inventors: Allyson J. Beuhler, James A. Wrezel
  • Patent number: 4573768
    Abstract: Electrochromic display devices which will maintain coloration after the electric current has been removed will comprise an electronic conductor consisting of a support which may be electrically conductive per se or contain an electronic conductor thereon, an electrochromic material in contact with said conductor, a solid electrolyte comprising a blend of an organic polymer and a heteropoly acid or salt thereof disposed on said electrochromic material and a counter-electrode in contact with the solid electrolyte. By utilizing this type of solid electrolyte, it is possible to obtain a display device which may range from about 5 to about 100 microns in thickness.
    Type: Grant
    Filed: December 5, 1983
    Date of Patent: March 4, 1986
    Assignee: The Signal Companies, Inc.
    Inventors: Anthony J. Polak, James A. Wrezel, Allyson J. Beuhler