Patents by Inventor Wen H. Chang

Wen H. Chang 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: 4808663
    Abstract: Disclosed is an ungelled acrylic resin composition containing an acrylic polymer having in a molecule thereof at least one group containing a silicon atom selected from: ##STR1## each R independently is selected from the group of moieties consisting of Y, hydrogen, a C.sub.1 -C.sub.10 group joined to Si through an Si-C linkage, and OR.sup.7 in which R.sup.7 represents alkykl having at least 4 carbon atoms, aryl, alkylaryl, arylalkyl, aryloxyalkyl, or alkyloxyalkyl, wherein Y represents an easily hydrolyzable group.The acrylic resin composition, contains an amount of easily hydrolyzable Y moieties such that the ratio of the number of grams of the ungelled acrylic resin composition to equivalent of easily hydrolyzable Y moieties in the ungelled acrylic resin composition is in the range of from 40 to 667. Preferred acrylic resin compositions of the invention can be cured in the presence of atmospheric moisture and a suitable catalyst at a temperature of less than or equal to 121 degrees Celsius within 3 hours.
    Type: Grant
    Filed: August 24, 1987
    Date of Patent: February 28, 1989
    Assignee: PPG Industries, Inc.
    Inventors: Wen H. Chang, Paul J. Prucnal, John R. Peffer, Edward L. Dufford, Ronald R. Ambrose
  • Patent number: 4788107
    Abstract: Disclosed is an ungelled acrylic resin composition containing an acrylic polymer having in a molecule thereof at least one group containing a silicon atom selected from: ##STR1## wherein each R independently is selected from the group of moieties consisting of Y, hydrogen, a C.sub.1 -C.sub.10 group joined to Si through an Si--C linkage, and OR.sup.7 in which R.sup.7 represents alkyl having at least 4 carbon atoms, aryl, alkylaryl, arylaklyl, aryloxyalkyl, or alkyloxyalkyl, wherein Y represents an easily hydrolyzable group.The acrylic resin composition, contains an amount of easily hydrolyzable Y moieties such that the ratio of the number of grams of the ungelled acrylic resin composition to equivalent of easily hydrolyzable Y moieties in the ungelled acrylic resin composition is in a range of from 40 to 667.
    Type: Grant
    Filed: August 24, 1987
    Date of Patent: November 29, 1988
    Assignee: PPG Industries, Inc.
    Inventors: Wen H. Chang, Paul J. Prucnal, John R. Peffer, Edward L. Dufford, Ronald R. Ambrose
  • Patent number: 4714738
    Abstract: Disclosed is an ungelled acrylic resin composition containing an acrylic polymer having in a molecule thereof at least one group containing a silicon atom selected from: ##STR1## wherein each R independently is selected from the group of moieties consisting of Y, hydrogen, a C.sub.1 -C.sub.10 group joined to Si through an Si-C linkage, and OR.sup.7 in which R.sup.7 represents alkyl having at least 4 carbon atoms, aryl, alkylaryl, arylalkyl, aryloxyalkyl, or alkyloxyalkyl, wherein Y represents an easily hydrolyzable group.The acrylic resin composition, contains an amount of easily hydrolyzable Y moieties such that the ratio of the number of grams of the ungelled acrylic resin composition to equivalent of easily hydrolyzable Y moieties in the ungelled acrylic resin composition is in a range of from 40 to 667.
    Type: Grant
    Filed: April 30, 1985
    Date of Patent: December 22, 1987
    Assignee: PPG Industries, Inc.
    Inventors: Wen H. Chang, Paul J. Prucnal, John R. Peffer, Edward L. Dufford, Ronald R. Ambrose
  • Patent number: 4622369
    Abstract: Disclosed is an ungelled urethane resin composition containing a urethane compound having in a molecule thereof at least one group containing a silicon atom selected from: ##STR1## wherein Q represents the residue from a urethane polyol; eachR which may be the same or different, represents hydrogen or a C.sub.1 -C.sub.10 group joined to Si through an Si-C linkage; andY represents an easily hydrolyzable group.The urethane resin composition contains an amount of easily hydrolyzable Y moieties such that the ratio of the number of grams of the ungelled urethane resin composition to equivalents of easily hydrolyzable Y moieties in the ungelled urethane resin composition is in a range of from 40 to 667. Preferred urethane resin compositions can be cured in the presence of atmospheric moisture and a suitable catalyst at a temperature of less than or equal to 121 degrees Celsius within 3 hours.Disclosed is a method for producing the ungelled urethane resin composition.
    Type: Grant
    Filed: April 30, 1985
    Date of Patent: November 11, 1986
    Assignee: PPG Industries, Inc.
    Inventors: Wen H. Chang, David T. McKeough, Ronald R. Ambrose
  • Patent number: 4392148
    Abstract: In superconductive circuitry including a superconducting ground plane, a magnetic flux trapping moat is provided which surrounds a superconductive device. The moat is preferably a cut through the superconducting ground plane which extends along a perimeter surrounding the superconducting device, the moat being continuous except for small regions where there is no cut. The small regions serve as current carrying portions to link the ground plane within the moat to the rest of the ground plane outside of the moat. The moat is a flux pinning center so that magnetic flux does not enter the ground plane region located near the superconducting device. In a Josephson circuit, the Josephson tunnel devices are especially sensitive to trapped magnetic flux in the ground plane, and the provision of a moat around each of the devices prevents flux from moving into the ground plane areas near the devices and becoming trapped therein.
    Type: Grant
    Filed: December 31, 1980
    Date of Patent: July 5, 1983
    Assignee: International Business Machines Corporation
    Inventors: Wen H. Chang, Tushar R. Gheewala, Erik P. Harris