The Fountain Pen Patent Archive

The instruments that put ink under pressure

Slide valve

Patent drawing of an 1856 fountain pen showing six figures: an assembled pen and case, a cutaway with internal piston and rod, separate case sections, and detailed close-ups of the nib and slide-valve mechanism at the pen tip.IMPROVED FOUNTAIN-PENHenry A. Brown and James Wiley · February 19, 1856