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The Fountain Pen Patent Archive

The instruments that put ink under pressure

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Hollow rubber bulb filler

Patent drawing showing a hand dipping a fountain pen's feeder tip into an inkstand while compressing a rubber bulb at the pen's top, alongside smaller cutaway diagrams of the pen barrel, ink-regulator bar and spring, rubber filling bulb, and protective cap.

FOUNTAIN-PEN.Parke P. Flournoy · April 11, 1882

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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