Historedia
Person

Dorr Eugene Felt

Events
1
Episodes
3
Years
1886–1887

Every event in Historedia whose sources name Dorr Eugene Felt, with the role they cite and all of that event’s episodes. This is not a biography, and mentions are grouped by name, so two people with the same name can share this page.

Events and episodes

  1. Dorr Felt patents the comptometer

    1886–1887

    Role: Inventor

    1. 1886-10-05 · Chicago workshopFirst Practical Machine

      Felt finished the first practical machine on October 5, 1886, using resources provided by Robert Tarrant in Chicago.

    2. 1887 · United StatesPatent Grant

      The first two patents for the comptometer were granted on July 19, 1887, and October 11, 1887, establishing legal protection for the key-driven calculator.

    3. 1887-11-28 · Partnership agreementPartnership Contract

      Felt and Tarrant signed a partnership contract on November 28, 1887, formalizing their collaboration before incorporation.

Sources

  1. Comptometer Wikipedia, revision of 2026-08-30
  2. Dorr Felt Wikipedia, revision of 2026-09-21