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{{PatentInfo |Inventor=Karl Weisser, Morris Levy |Assignee=David Kahn Inc |Country=US |ApplicationNum=502986 |ApplicationDate=1955-04-21 |PatentNum=2951465 |PatentDate=1960-09-06 |PriorityDate=1955-04-21 |Titolo=Retractable writing instrument |Marca=We...
{{PatentInfo
|Inventor=Karl Weisser, Morris Levy
|Assignee=David Kahn Inc
|Country=US
|ApplicationNum=502986
|ApplicationDate=1955-04-21
|PatentNum=2951465
|PatentDate=1960-09-06
|PriorityDate=1955-04-21
|Titolo=Retractable writing instrument
|Marca=Wearever
|Descrizione=Penna a sfera
}}
==Informazioni==
Brevetto per una penna a sfera. Riferimenti a {{MentionPatent|US|272948}}, {{MentionPatent|US|1294247}}, {{MentionPatent|US|2205929}}, {{MentionPatent|US|2392840}}, {{MentionPatent|US|2427068}}, {{MentionPatent|US|2441280}}, {{MentionPatent|US|2603186}}, {{MentionPatent|US|2715388}}, {{MentionPatent|US|2753844}} e {{MentionPatent|US|2778337}} ed inoltre {{MentionPatent|FR|976412}}, {{MentionPatent|FR|934235}}, {{MentionPatent|FR|1076270}} e {{MentionPatent|FR|1094542}}.
|Inventor=Karl Weisser, Morris Levy
|Assignee=David Kahn Inc
|Country=US
|ApplicationNum=502986
|ApplicationDate=1955-04-21
|PatentNum=2951465
|PatentDate=1960-09-06
|PriorityDate=1955-04-21
|Titolo=Retractable writing instrument
|Marca=Wearever
|Descrizione=Penna a sfera
}}
==Informazioni==
Brevetto per una penna a sfera. Riferimenti a {{MentionPatent|US|272948}}, {{MentionPatent|US|1294247}}, {{MentionPatent|US|2205929}}, {{MentionPatent|US|2392840}}, {{MentionPatent|US|2427068}}, {{MentionPatent|US|2441280}}, {{MentionPatent|US|2603186}}, {{MentionPatent|US|2715388}}, {{MentionPatent|US|2753844}} e {{MentionPatent|US|2778337}} ed inoltre {{MentionPatent|FR|976412}}, {{MentionPatent|FR|934235}}, {{MentionPatent|FR|1076270}} e {{MentionPatent|FR|1094542}}.