Patents by Inventor Bruce Leffingwell

Bruce Leffingwell 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).

  • Phenolic-acrylic fast-curing sealant system
    Patent number: 4107239
    Abstract: The admixture of the tri(hydromethacrylate) of tris(dimethylaminomethyl)phenol with conventional monomer and polymer components of vinylpolymerizable liquid sealants yields compositions which have accelerated cure times and superior adhesion.
    Type: Grant
    Filed: November 25, 1975
    Date of Patent: August 15, 1978
    Assignee: MPB Corporation
    Inventor: Bruce Leffingwell
  • Phenolic-acrylic fast-curing sealant system
    Patent number: 3957907
    Abstract: The admixture of the tri(hydromethacrylate) of tris(dimethylaminomethyl) phenol with conventional monomer and polymer components of vinyl-polymerizable liquid sealants yields compositions which have accelerated cure-times and superior adhesion.
    Type: Grant
    Filed: October 24, 1974
    Date of Patent: May 18, 1976
    Inventor: Bruce Leffingwell