Wednesday, February 20, 2013

early patent dates

this is such a useful resource for dating early pens.  the only thing that would make it better if they said when the patents expired


http://www.fountainpen.it/Patent_list

1 comment:

  1. As the author of the page I'd like to point out that putting an expire date was not worth the effort, patents expire after 20 year, so having clearly shown the issue date having the expire date is trivial.

    Regards
    Simone Piccardi

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