Patents by Inventor Daniel F. T. Roberts

Daniel F. T. Roberts 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).

  • Solder flux compositions
    Patent number: 4419146
    Abstract: Solder flux compositions are prepared by forming a dispersion of a flux material in a liquid in which the flux is substantially insoluble. The composition may be applied to a workpiece by brushing, spraying, or as an unstable foam. A method of tinning circuit boards using such flux compositions is also described.
    Type: Grant
    Filed: July 15, 1981
    Date of Patent: December 6, 1983
    Assignee: International Standard Electric Corporation
    Inventor: Daniel F. T. Roberts
  • Solder flux composition
    Patent number: 4360392
    Abstract: A solder flux composition comprises a mixture of sarcosine and tartronic or tartaric acid dissolved in water and an aliphatic alcohol. Typically the acid-sarcosine weight ratio lies within the range 90:10 to 30:70 and the solution may contain between 5 and 20 weight percent of solids. The flux is employed for tin/lead soldering of a range of metals and alloys including copper, nickel and nickel-iron. Bidegradation of the flux is inhibited by the inclusion of lead carbonate, phenol or salicylic acid in the composition.
    Type: Grant
    Filed: January 23, 1981
    Date of Patent: November 23, 1982
    Assignee: International Standard Electric Corporation
    Inventor: Daniel F. T. Roberts