Skip to content

The Fountain Pen Patent Archive

The instruments that put ink under pressure

Browse Dates Inventors Types About

Float valve

Patent drawing of a rotary syrup-filling machine showing a circular superstructure with an array of numbered gears, cams, and syrup chambers arranged around a central shaft, with a magnified detail of the float-valve assembly above.

SYRUPER.Albert R. Thompson · July 20, 1915

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.

About · Terms · Privacy · Corrections welcome — this archive gets better when collectors write in.