Patents by Inventor Richard MacDuff

Richard MacDuff 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).

  • Yarn structure having main filaments and tie filaments
    Patent number: 4274251
    Abstract: Methods of making network structures include forming on one side of a sheet of thermoplastic polymer a plurality of parallel continuous main ribs and forming on the other side of the sheet in a different direction a plurality of parallel discontinuous tie ribs. The tie ribs are discontinuous in the areas where they cross over the main ribs to eliminate any increased thickness at the cross-over points of the main ribs and tie ribs. The ribbed sheet thus formed is drawn in either one direction or in two preferably perpendicular directions to open the sheet into a network structure and to orient the main ribs and preferably also to orient the tie ribs.
    Type: Grant
    Filed: October 16, 1978
    Date of Patent: June 23, 1981
    Assignee: Hercules Incorporated
    Inventors: Charles W. Kim, Chia-Seng Liu, Richard MacDuff
  • Network structures and methods of making same
    Patent number: 4207375
    Abstract: Methods of making network structures include forming on one side of a sheet of thermoplastic polymer a plurality of parallel continuous main ribs and forming on the other side of the sheet in a different direction a plurality of parallel discontinuous tie ribs. The tie ribs are discontinuous in the areas where they cross over the main ribs to eliminate any increased thickness at the cross-over points of the main ribs and tie ribs. The ribbed sheet thus formed is drawn in either one direction or in two preferably perpendicular directions to open the sheet into a network structure and to orient the main ribs and preferably also to orient the tie ribs.
    Type: Grant
    Filed: December 15, 1976
    Date of Patent: June 10, 1980
    Assignee: Hercules Incorporated
    Inventors: Charles W. Kim, Chia-Seng Liu, Richard MacDuff
  • Network structures and methods of making same
    Patent number: 4186781
    Abstract: Methods of making network structures include forming on one side of a sheet of thermoplastic polymer a plurality of parallel continuous main ribs and forming on the other side of the sheet in a different direction a plurality of parallel discontinuous tie ribs. The tie ribs are discontinuous in the areas where they cross over the main ribs to eliminate any increased thickness at the cross-over points of the main ribs and tie ribs. The ribbed sheet thus formed is drawn in either one direction or in two preferably perpendicular directions to open the sheet into a network structure and to orient the main ribs and preferably also to orient the tie ribs.
    Type: Grant
    Filed: April 14, 1978
    Date of Patent: February 5, 1980
    Assignee: Hercules Incorporated
    Inventors: Charles W. Kim, Chia-Seng Liu, Richard MacDuff
  • Method of making network structures
    Patent number: 4101358
    Abstract: Methods of making network structures include forming on one side of a sheet of thermoplastic polymer a plurality of parallel continuous main ribs and forming on the other side of the sheet in a different direction a plurality of parallel discontinuous tie ribs. The tie ribs are discontinuous in the areas where they cross over the main ribs to eliminate any increased thickness at the cross-over points of the main ribs and tie ribs. The ribbed sheet thus formed is drawn in either one direction or in two preferably perpendicular directions to open the sheet into a network structure and to orient the main ribs and preferably also to orient the tie ribs.
    Type: Grant
    Filed: December 15, 1976
    Date of Patent: July 18, 1978
    Assignee: Hercules Incorporated
    Inventors: Charles W. Kim, Chia-Seng Liu, Richard MacDuff