Double-chuck mechanical pencil
Patent 6379067 Issued on April 30, 2002. Estimated Expiration Date: 
November 22, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 22, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2473149 2845898 3765781 Mechanical pencil Push type mechanical pencil Lead engaging chuck mechanism for mechanical pencil Mechanical pencil Lead chuck of mechanical pencil Mechanical pencil with a plastic chuck Mechanical pencil InventorsAssigneeApplicationNo. 444517 filed on 11/22/1999US Classes:401/94, Spring-urged clamp401/65, Step-by-step401/67Alternately grasping chucksExaminersPrimary: Huson, Gregory L.Attorney, Agent or FirmInternational ClassB43K 021/22Foreign Application Priority Data1997-05-13 JPAbstractA double-chuck mechanical pencil has an outer tube, a tip fitting provided in the front of the outer tube, a tip chuck located at the tip of the tip fitting for holding a writing substance (e.g., a lead) and urged rearward in the axial directed, and a delivery chuck for delivering the lead. At least one of the tip chuck and the delivery chuck is formed of a synthetic resin material including polyoxymethylene. | |
