U.S. Utility Patent 2,895,584 (US2895584A)

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Provided by the ASK Keyboard Patents database

A patent drawing depicting IBM's single element printing head

Applied 17th November 1955

Published 21st July 1959

Expired 21st July 1976

More informaion

Name	Single element printing head
Inventors	John E. Hickerson, Ralph E. Page, James A. Weidenhammer
Assignees	IBM
Description	An invention of a single, spherical device that can be used for typewriting and printing. Its surface is covered in characters in predictable locations, so the device can be rotated to select a desired character before being strunk against paper. This was implemented as the "golfball" printing element used by IBM Selectric family typewriters and printers.

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