Patents by Inventor Donald A. Vassallo

Donald A. Vassallo 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).

  • Polyvinyl alcohol based wax-free size composition
    Patent number: 4640946
    Abstract: Polyvinyl alcohol based sizing solution containing a small amount of low ethylene oxide adduct of branched alcohol provides superior operability during sizing and weaving, and yields fabric that exhibits improved finishing performance.
    Type: Grant
    Filed: August 14, 1985
    Date of Patent: February 3, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald A. Vassallo, David W. Zunker
  • Heat seal composition
    Patent number: 4469754
    Abstract: Heat seal compositions and articles including the compositions are disclosed. The compositions exhibit a broad temperature range for making heat seals of variable strengths and are useful as the sole heat seal composition in making flexible packages requiring both permanent and peelable seals.
    Type: Grant
    Filed: May 14, 1982
    Date of Patent: September 4, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: George L. Hoh, Donald A. Vassallo
  • Heat seal composition comprising a blend of metal neutralized polymers
    Patent number: 4346196
    Abstract: Heat seal compositions and articles including the compositions are disclosed. The compositions exhibit a broad temperature range for making heat seals of variable strengths and are useful as the sole heat seal composition in making flexible packages requiring both permanent and peelable seals.
    Type: Grant
    Filed: September 10, 1980
    Date of Patent: August 24, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: George L. Hoh, Donald A. Vassallo