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US 5,839,609 AGranted
Thermoformed pack with ridge valve
AssigneeColgate-Palmolive Company
InventorIssac Zakensberg
Life of this patent
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AssigneeColgate-Palmolive Company
InventorIssac Zakensberg
Estimating the term…
The thermoformed package has a positive sealing ridge valve so that portions of the thermoformed package can be dispensed at different times. There is a relatively thick, shaped bottom sheet and a relatively thin, substantially planar, top sheet. The top sheet is bonded to the shaped bottom sheet around the perimeter of the shaped bottom sheet. At one end of the shaped bottom sheet there is a narrowed region with at least two recesses and a ridge separating the recessed areas. The ridge extends to or above the top surface of the shaped bottom sheet. The top sheet and the ridge cooperate to form a ridge valve to seal the body portion of the thermoformed package from a dispensing opening until a positive force is applied to the body portion. The thermoformed package is opened by the removal of a tab located beyond the recesses and ridge. The recesses and ridge in the shaped bottom sheet and the relatively thin top sheet form an effective sealing valve.
A thermoformed pack having a body portion and a valve portion, said body portion terminating at one end in said valve portion, said body portion and said valve portion being closed by a substantially planar top wall having a thickness less than that of said body portion and said valve portion, said valve portion having a dispensing opening sealed by a breakaway tab, a first recess chamber and a second recess chamber separated by a separating ridge, said top wall contacting said separating ridge and being sufficiently flexible to extend into each of said first chamber and said second chamber, said first recess chamber, said second recess chamber and said substantially planar top wall closing said valve portion upon the removal of said breakaway tab and the absense of a dispensing force on said body portion.
Dependencies are inferred from the claim text.