Method of manufacture of a gated can lid with score at upper surface
Patent 4018178 Issued on April 19, 1977. Estimated Expiration Date: 
April 19, 1994. 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.
April 19, 1994. 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 3705563 3880316 InventorsAssigneeApplicationNo. 05/625716 filed on 10/24/1975US Classes:413/13, Forming user lip guard220/268, Non-removable member or portion413/17Scoring to form fracture lineExaminersPrimary: McGehee, Travis S.Attorney, Agent or FirmInternational ClassB21D 51/38 (20060101)AbstractA can lid includes a pushdown gate formed in a panel portion below a narrow, underfolded rim at the opening in the lid. The outline of the gate is a disruptible score cut in the panel portion underneath the rim. This structure is essentially the same as that disclosed in the Klein-Harper U.S. Pat. No. 3,334,775. However, the score cut defining the outline of the gate is at the upper surface of the panel portion instead of being at the undersurface. A method of drawing and folding the lid material permits the score line to be cut before the underfolded rim is formed over the score cut. | |
