為何叫「原子筆」，跟「原子」有何關聯？
https://www.saydigi.com/2016/09/ladislao-jose-biro-ball-pen.html
Ladislao José Biro在1943年取得的"現代原子筆"的美國專利 - 書寫工具（US2390636）
Claim 1範圍明確：書寫工具，大約是包括容納濃縮油墨的容器，墨水經導管導入進氣口與球形筆尖，球形筆尖隔開墨水通道，設在可以書寫的位置。
1. A writing instrument of the type comprising a reservoir for charging dense ink having an air-intake and a free ball tip located in a corresponding setting and fed through a single conduit derived from said reservoir, wherein said ball setting is constituted by channels provided in the Walls thereof and leading from said conduit to the sides of the setting socket, said channels being spaced so as to remain in alternate relation with bearing seats for said ball in said setting.
原子筆持續改良，到現在文具店林林總總的原子筆，真是驚嘆發明人持續在看似小東西上的改進與突破，常常忍不住買個幾支，確實很多是很順手的原子筆。
列舉一些從Google找到早期經典的原子筆專利：
原子筆最早專利（非Ladislao José Biro所有，更早了50年以上）：US392046
Claim 1就是任性的一句話，一支具有球形標記筆尖的筆，如說明書所述。
1. A pen having a spheroidal marking-point, substantially as described.
具有彈簧可伸縮的原子筆：US3288115（Ball-point pen mechanism）
US3120837（Writing instruments having a retractable writing point）
這是Pentel在1980年發明的可擦式原子筆：US4357431（Ball-point pen ink composition erasable by rubber eraser），專利範圍描述墨水的成份：
Pentel在1970年申請的原子筆前端球的安置裝置，這對原子筆書寫順上很有幫助：US3,708,234（Ball holder of ball-point pen）：
資訊參考：
https://en.wikipedia.org/wiki/Ballpoint_pen
https://www.saydigi.com/2016/09/ladislao-jose-biro-google-doodle.html
Ron
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