Patents by Inventor Pat Y. H. Wang

Pat Y. H. Wang 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: 5518981
    Abstract: The invention relates to a process for producing multi-layered carbonless sheets on which indicia can be xerographically produced with little or no non-specific development. The process involves coating a sheet with a CB composition containing a carboxymethyl cellulose polymer, a crosslinker, a salt of a polyvalent metal ion and a small amount of a wall forming acrylic resin. The CB coating formed resists breakage and release of dye when non-specific pressure is applied to the sheet thereby resulting in CF copies having improved brightness and reduced non-specific development.
    Type: Grant
    Filed: November 30, 1994
    Date of Patent: May 21, 1996
    Assignee: Nashua Corporation
    Inventors: Richard Nelson, Pat Y. H. Wang
  • Patent number: 4822416
    Abstract: Disclosed is a coating composition for producing a high solids content carboxymethylcellulose based "CB" coating for use in pressure sensitive carbonless copy systems. The formulation comprises carboxylmethylcellulose, a wall-forming carboxylated acrylic resin, an organic cross-linker, a polyvalent metal salt, and an oil containing color-forming dye. The composition has a solids content of at lesat 30% and a viscosity within the range of 50 to 5000 centiposes. The CB paper exhibits the ability to produce improved imaging on computer and dot matrix printers because of better release efficiency and may be manufactured using less energy.
    Type: Grant
    Filed: September 8, 1987
    Date of Patent: April 18, 1989
    Assignee: Nashua Corporation
    Inventors: George O. Langlais, Pat Y. H. Wang, Joseph S. Chaplick
  • Patent number: 4822769
    Abstract: Disclosed is a coating composition for producing a high solids content carboxymethylcellulose based "CB" coating for use in pressure sensitive carbonless copy systems. The formulation comprises carboxylmethylcellulose, a wall-forming carboxylated acrylic resin, an organic cross-linker, a polyvalent metal salt, and an oil containing color-forming dye. The composition has a solids content of at least 30% and a viscosity within the range of 50 to 5000 centiposes. The CB paper exhibits the ability to produce improved imaging on computer and dot matrix printers because of better release efficiency and may be manufactured using less energy.
    Type: Grant
    Filed: August 20, 1987
    Date of Patent: April 18, 1989
    Assignee: Nashua Corporation
    Inventors: George O. Langlais, Pat Y. H. Wang, Joseph S. Chaplick