Patents by Inventor J. Sundar Rajan

J. Sundar Rajan 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: 6790578
    Abstract: A weather resistant sign and a method of printing a sign including the steps of providing a sign component and an image definition, applying dry toner powder to surface portions corresponding to the image definition, and fusing the applied toner. Preferably, the fused toner is protected from weather by a transparent protective layer. A toner composition and a computer program for printing are also disclosed.
    Type: Grant
    Filed: March 7, 1994
    Date of Patent: September 14, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: J. Sundar Rajan, Vincent Joseph Mako
  • Patent number: 6482510
    Abstract: A novel form construction comprising a substrate (e,g., a form sheet or roll goods) having a digital printable surface portion and a release surface portion, on which release coating surface portion a signage with a pressure-sensitive adhesive can be releasably adhered. A digital printable release coating composition is also provided.
    Type: Grant
    Filed: August 10, 2000
    Date of Patent: November 19, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: J. Sundar Rajan, Roberta E. Harelstad, Joey L. Reule, Ramesh C. Kumar
  • Patent number: 6406787
    Abstract: A novel form construction comprising a form sheet having a digital printable surface portion and a release surface portion, on which release coating surface portion a signage with a pressure-sensitive adhesive can be releasably adhered. A digital printable release coating composition is also provided.
    Type: Grant
    Filed: August 24, 1999
    Date of Patent: June 18, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: J. Sundar Rajan, Roberta E. Harelstad, Joey L. Reule, Ramesh C. Kumar
  • Patent number: 5928827
    Abstract: The present invention discloses signage articles having a layer of fused dry toner powder which is fused by employing a tacky pressure-sensitive adhesive and low compression. Suitable tacky pressure-sensitive adhesives include alkyl acrylate polymers or copolymers, alkyl vinyl ether polymers or copolymers, polyisobutylene, polybutadiene, and butadiene-styrene copolymers. Such signage articles further comprise a transparent cover layer disposed over the fused dry toner powder-bearing surface. Also disclosed are methods of forming signage articles, one method comprising the steps of applying dry toner powder to a first substrate surface, applying a composition including a tacky pressure-sensitive adhesive to a second substrate surface, and laminating the two substrates to admix the dry toner powder and the tacky pressure-sensitive adhesive. Either the first or second substrate may be the transparent cover layer of the resulting signage article.
    Type: Grant
    Filed: March 6, 1998
    Date of Patent: July 27, 1999
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: J. Sundar Rajan
  • Patent number: 5725935
    Abstract: The present invention discloses signage articles having a layer of fused dry toner powder which is fused by employing a tacky pressure-sensitive adhesive and low compression. Suitable tacky pressure-sensitive adhesives include alkyl acrylate polymers or copolymers, alkyl vinyl ether polymers or copolymers, polyisobutylene, polybutadiene, and butadiene-styrene copolymers. Such signage articles further comprise a transparent cover layer disposed over the fused dry toner powder-bearing surface. Also disclosed are methods of forming signage articles, one method comprising the steps of applying dry toner powder to a first substrate surface, applying a composition including a tacky pressure-sensitive adhesive to a second substrate surface, and laminating the two substrates to admix the dry toner powder and the tacky pressure-sensitive adhesive. Either the first or second substrate may be the transparent cover layer of the resulting signage article.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: March 10, 1998
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: J. Sundar Rajan
  • Patent number: 5672381
    Abstract: A weather resistant sign and a method of printing a sign including the steps of providing a sign component and an image definition, applying dry toner powder to surface portions corresponding to the image definition, and fusing the applied toner. Preferably, the fused toner is protected from weather by a transparent protective layer. A toner composition and a computer program for printing are also disclosed.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 30, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: J. Sundar Rajan
  • Patent number: 5378575
    Abstract: A weather resistant sign and a method of printing a sign including the steps of providing a sign component and an image definition, applying dry toner powder to surface portions corresponding to the image definition, and fusing the applied toner. Preferably, the fused toner is protected from weather by a transparent protective layer. A toner composition and a computer program for printing are also disclosed.
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: January 3, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: J. Sundar Rajan, Vincent J. Mako
  • Patent number: 5085918
    Abstract: A weather resistant sign and a method of printing a sign including the steps of providing a sign component and an image definition, applying dry toner powder to surface portions corresponding to the image definition, and fusing the applied toner. Preferably, the fused toner is protected from weather by a transparent protective layer. A toner composition and a computer program for printing are also disclosed.
    Type: Grant
    Filed: May 15, 1990
    Date of Patent: February 4, 1992
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: J. Sundar Rajan, Vincent J. Mako