ApplicationNo. 464418 filed on 01/12/1990
US 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 cavity
ExaminersPrimary: Marcus, Stephen
Assistant: Cronin, Stephen K.
Attorney, Agent or Firm
International ClassB65D 041/04
AbstractThis 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 pressure
Including visual indicia
With pressure-responsive valve
Line of weakness extends circumferentially of receptacle mouth opening
One step reshapes portion only of article
Reshaping solid work or introducing solid work into mold cavity