Patents by Inventor Nagaraj KUPPUSAMY

Nagaraj KUPPUSAMY 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).

  • Polylactide-based masterbatch, for a commercially viable single-step in-mold annealing injection molding process
    Patent number: 11905407
    Abstract: Polylactide (PLA) parts can be crystallized via two procedures. In the first procedure, i.e. a 2-step post-mold annealing process, the complete crystallization of PLA parts can be done after molding in a secondary operation called as post-mold annealing to make higher heat-resistant PLA parts. There are limitations to this 2-step operation, namely, a) warpage of parts with complex geometries, and b) scaling up higher production volume times. In the second procedure, i.e. 1-step in-mold annealing process, the complete crystallization of PLA parts can be done in the mold itself by holding the temperature of the mold at the crystallization temperature of PLA which is about 100° C. The 1-step in-mold annealing process using a masterbatch blended with neat PLA results in a highly crystalline article produced in a significantly lower cycle time.
    Type: Grant
    Filed: May 13, 2020
    Date of Patent: February 20, 2024
    Assignee: Northern Technologies International Corporation
    Inventors: Shilpa Manjure, Nagaraj Kuppusamy, Matthew Lundblad
  • POLYLACTIDE-BASED MASTERBATCH, FOR A COMMERCIALLY VIABLE SINGLE-STEP IN-MOLD ANNEALING INJECTION MOLDING PROCESS
    Publication number: 20220204755
    Abstract: Polylactide (PLA) parts can be crystallized via two procedures. In the first procedure, i.e. a 2-step post-mold annealing process, the complete crystallization of PLA parts can be done after molding in a secondary operation called as post-mold annealing to make higher heat-resistant PLA parts. There are limitations to this 2-step operation, namely, a) warpage of parts with complex geometries, and b) scaling up higher production volume times. In the second procedure, i.e. 1-step in-mold annealing process, the complete crystallization of PLA parts can be done in the mold itself by holding the temperature of the mold at the crystallization temperature of PLA which is about 100° C. The 1-step in-mold annealing process using a masterbatch blended with neat PLA results in a highly crystalline article produced in a significantly lower cycle time.
    Type: Application
    Filed: May 13, 2020
    Publication date: June 30, 2022
    Inventors: Shilpa MANJURE, Nagaraj KUPPUSAMY, Matthew LUNDBLAD