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The Fountain Pen Patent Archive

The instruments that put ink under pressure

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Ball valve regulator

Patent drawing showing six views of a hard rubber fountain pen: a full assembled pen with tapered nib, a cross-sectioned barrel revealing the internal feed plug and ball valve mechanism, an enlarged feed plug with detachable nozzle, the same feed plug separated with pen point removed, a circular cross-section showing the slit and grooves, and a thin flat auxiliary conductor reed.

FOUNTAIN-PEN.Marvin M. Fenner · August 22, 1893

United States patent drawings and specifications are works of the U.S. government and are in the public domain — they were never copyrighted. Download them, print them, frame them. Our commentary and descriptions are © 2026 The Fountain Pen Patent Archive.

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