KnowraJohn J. LoudLinked fromLinked fromThe 3 pages that link to John J. Loud, each with the reason it gives.All 3Related 2Compared with 1Ballpoint penRelated: His design targeted marking rough surfaces, but was unsuitable for ordinary writing.Writing instrumentRelated: His patent addressed marking leather, though it did not produce a successful commercial pen.László BíróCompared with: His earlier patent shows that Bíró refined an existing idea rather than inventing the first ballpoint.