Plastic closure with safety button and method of forming same
Patent 5033633 Issued on July 23, 1991. Estimated Expiration Date: 
January 12, 2010. 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.
January 12, 2010. 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 2194004 3144154 3160302 3448881 3622028 3629901 3672527 3720979 3888378 Recloseable container InventorAssigneeApplicationNo. 464418 filed on 01/12/1990US Classes:215/271, Closure expands responsive to internal receptacle pressure206/459.1, WITH INDICATOR (I.E., VARIABLE INFORMATION EXHIBITING MEANS)206/524.8, EVACUATED215/230, Including visual indicia264/296, One step reshapes portion only of article264/320Reshaping solid work or introducing solid work into mold cavityExaminersPrimary: Marcus, StephenAssistant: Cronin, Stephen K. Attorney, Agent or FirmInternational ClassB65D 041/04AbstractThis relates to the formation of a vacuum indicating button in a molded plastic closure. The button is formed by cold working which results in the flow of plastic material from a central portion of the end panel towards the center of the central portion and the automatic formation of an upwardly projecting generally curved button. In all forms the button is formed by cold working of the plastic. The button may be formed by coining between two opposed tools, or the button may be formed by cold working only the top side of the central portion of the end panel by such methods as including spinning, mechanical peening and shot peening. In the case of coining, the button may be formed either by a single annular ring of cold worked, oriented, reduced thickness material or by a plurality of such rings.Field of SearchClosure expands responsive to internal receptacle pressureScrew Including visual indicia With pressure-responsive valve Line of weakness extends circumferentially of receptacle mouth opening EVACUATED One step reshapes portion only of article Reshaping solid work or introducing solid work into mold cavity | |
