Patents by Inventor Eric C. Wahlberg

Eric C. Wahlberg 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).

  • Writing instrument
    Patent number: 4000950
    Abstract: A writing instrument having a plurality of writing media assemblies separately positionable in writing position by a single independent actuator.
    Type: Grant
    Filed: July 9, 1975
    Date of Patent: January 4, 1977
    Inventor: Eric C. Wahlberg
  • Convertible writing instrument
    Patent number: 3985455
    Abstract: A writing instrument having a plurality of writing medium assemblies which can be separated into a plurality of writing instruments each having at least one writing medium assembly. The writing instrument may include writing medium assemblies which are all retractable, all fixed or both retractable and fixed. Regardless of whether the writing instrument has a single or plurality of retractable writing medium assemblies, only one positioning device is required to position the writing medium assemblies in writing position.
    Type: Grant
    Filed: January 10, 1975
    Date of Patent: October 12, 1976
    Inventor: Eric C. Wahlberg