Patents by Inventor Asok Sengupta

Asok Sengupta 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).

  • Intersection markings
    Patent number: 5127973
    Abstract: Pavement-marking sheet materials of increased durability comprise a tough, abrasion-resistant top layer, preferably a polyurethane film having substantial flexibility but including trifunctional hydroxyl-terminated components of short molecular weight so as to obtain a significant degree of crosslinking, and a conformable underlying layer. A preferred underlying layer comprises unvulcanized elastomer precursor.
    Type: Grant
    Filed: July 11, 1990
    Date of Patent: July 7, 1992
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Asok Sengupta, John L. Ethen, Stanley J. Jordan
  • Vapor permeation curable coatings based on alkyd resins
    Patent number: 4298658
    Abstract: Improved coating compositions for use in diversified applications, curable by permeation of a tertiary amine vapor or without permeation at room temperature. The composition and the coating process are characterized by the modification of an alkyd resin, having free hydroxyl groups, by reaction with p-hydroxybenzoic acid or 2,6-dimethylol-p-cresol. The coatings display good flexibility and high gloss as well as good color retention and good adhesion to substrates.
    Type: Grant
    Filed: May 1, 1980
    Date of Patent: November 3, 1981
    Assignee: J.G.L. Chemicals Ltd.
    Inventors: Chacko Thankachan, John G. Ritchie, Eugene Sahayada, Asok Sengupta
  • Vapor permeation curable coatings based on alkyd resins
    Patent number: 4267239
    Abstract: Improved coating compositions for use in diversified applications, curable by permeation of a tertiary amine vapor or without permeation at room temperature. The composition and the coating process are characterized by the modification of an alkyd resin, having free hydroxyl groups, by reaction with p-hydroxybenzoic acid. The coatings display good flexibility and high gloss as well as good color retention and good adhesion to substrates.
    Type: Grant
    Filed: September 19, 1979
    Date of Patent: May 12, 1981
    Assignee: J.G.L. Chemicals Ltd.
    Inventors: Chacko Thankachan, John G. Ritchie, Eugene Sahayada, Asok Sengupta