Category: Patent
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Stretch Vacumatic patent
Johannes Iversen patented the “Stretch Vacumatic” filling system for fountain pens in 1939 in the USA. I’ve made a posting that describes how to repair such a pen which can...
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Early feeder design
Waterman’s early patent on feeder design, describing the mechanism of feeding the ink downwards to the nib while simultaneously allowing air back up into the reservoir.