Lid with a pump/bellows device

Details Lid with a pump/bellows device Lid with a pump/bellows device

2002-02-22

2004-01-13

Newhouse, Nathan J. (Department: 3727)

Receptacles

Closures

Combined or convertible

C215S228000, C141S065000

Reexamination Certificate

active

06675982

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to containers that store food under a vacuum seal. More particularly, the present invention relates to a lid which contains a pump/bellows device to manually pull a vacuum within the container, thus preserving the food stored within the container.
BACKGROUND
Vacuum packaging food maintains the freshness and flavor of the food three to five times longer than food packaged with conventional storage methods. This improvement is because the amount of oxygen available for interaction with the food is reduced as a result of the vacuum. Thus, microorganisms that require oxygen to grow, such as bacteria and yeast, affect food stored in a vacuum less than food stored using conventional methods. Additionally, vacuum packed foods that are frozen are less affected by freezer bum because there is less cold, dry air to dehydrate the food.
The excess air that accompanies food packed using conventional packaging methods can have a variety of effects on the packaged food. For instance, dry foods can absorb moisture from the atmosphere, thereby becoming soggy. Yet, moist foods can become dry when packaged using conventional methods because air absorbs moisture from the moist food.
An example of a dry food is sugar. When sugar is stored such that moisture from the air can be absorbed, the sugar can harden into a solid block. Such a block is unappealing at the very least. Furthermore, a pound of sugar in the form of a single block is very difficult to use. If the sugar had been packaged in a vacuum, then moisture from the atmosphere could not be absorbed by the sugar. Thus, the sugar would remain in granular form and not turn into a solid block.
An example of a moist food is bread. When bread is stored in such a way as to allow exposure to the atmosphere, the bread tends to dry out and become hard and crusty. If, however, the bread was stored in a vacuumed packed storage container, then the atmosphere could not absorb the bread's moisture. Thus, the bread would maintain the proper amount of moisture and stay fresh and soft.
Bread, however, also suffers from microorganisms like bacteria, yeast, and mold growths due to temperature changes and excess moisture. Storing bread with a conventional packaging method gives the microorganisms access to the atmosphere, thereby permitting the microorganisms to grow. Consequently, the bread becomes unsuitable for consumption. Storing the bread in a vacuum prevents the atmosphere from depositing any new microorganisms or reacting with any existing microorganisms. Thus, the vacuum packaging allows the bread to maintain its freshness.
Yet another example of a food stored in conventional packaging devices is food that is high in fats and oils, such as butter. When food like butter is exposed to the atmosphere, over time it becomes rancid, causing an unpleasant taste and smell. If the butter had been packaged in a vacuum, then the butter could not react with the atmosphere and turn rancid. Hence, the butter stored in a vacuum would remain fresh longer than if it had been packaged using a conventional packaging method.
There are several types of home vacuum packaging systems currently available in the marketplace. For instance, there are manually operated vacuum pumps. These systems typically consist of a small, manually-operated pump which can be used to extract air from a container. Although they do not completely remove the air from the container, they do help food last longer. Another example of a home vacuum system is a bag sealer that includes a fan. Such a systems uses a small rotary fan to extract some air out of a plastic bag before the bag is sealed. Several different bag configurations are available in the market for such a bag sealer/fan system. For instance, one such system uses a polyethylene bags. Other bag sealer/fan system use sheets of plastic from which bags of different lengths can be made. This variable bag system “welds” the seams of the plastic sheets with a heated wire bag-sealing mechanism, thereby forming a closed bag. However, the fans in these home vacuum packaging systems do not have the ability to create a vacuum. This can be seen because the plastic used for the containers will loosely form around the contours of the food in the bag, but it will be obvious that air remains in the bag. Also, the strength of the seal and the material used for the bag in these home vacuum packaging systems will determine whether any air, atmosphere, or oxygen can re-enter the bag.
Another type of home vacuum packaging systems uses an electric pump systems. These systems are the only storage systems that eliminate exposure to oxygen. They use electric-powered piston pumps to first extract air from a container. Then, the container is sealed to prevent any air, atmosphere, or oxygen from re-entering the sealed container. A consumer using such a home vacuum packaging systems can easily see that a vacuum is formed, when the container used to seal the food is a bag, because the bag will shape itself tightly around the food. Yet, when the container is more ridged, like a jar or a glass dish, a change in the physical shape of the container cannot be seen when the vacuum is present.
SUMMARY OF THE INVENTION
It is an object of an embodiment of the present invention to create a vacuum sealable container where the vacuum seal is achieved manually by a pump/bellows lid to prevent air from re-entering into the container.
Thus, there is a need for an improved lid to manually pump the air out of a container to achieve a vacuum seal.


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