Patents by Inventor Lesley D. Herbert

Lesley D. Herbert 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).

  • Reinforced rubber
    Patent number: 4200556
    Abstract: A blend of rubber comprising 100 parts of a rubber, from 5 to 150 parts of a carbazole/phenol/formaldehyde resin, from 1 to 5 parts of a vulcanizing agent for the rubber and from 5 to 15 parts per hundred parts of the resin of a formaldehyde donor, is made up. This is done in any usual manner. The blend is then heated, preferably under pressure, to vulcanize the rubber and cross-link the resin. A preferred method of making the resin is described. The invention also comprises reinforced rubbers made according to the process.
    Type: Grant
    Filed: May 12, 1978
    Date of Patent: April 29, 1980
    Assignee: Coal Industry (Patents) Limited
    Inventors: Joseph G. Robinson, Lesley D. Herbert
  • Phenolic resols blended with N-methylol carbazoles
    Patent number: 4181688
    Abstract: Cross-linkable phenolic resols are known but do not have good water resistance. Phenolic resols can be blended with N-methylol carbazole or a derivative thereof to give a cross-linkable material useful for laminating or as a metal cement.
    Type: Grant
    Filed: November 20, 1978
    Date of Patent: January 1, 1980
    Assignee: Coal Industry (Patents) Limited
    Inventors: Joseph G. Robinson, Lesley D. Herbert