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US 4,055,931 AGranted
Method and apparatus for providing a controlled atmosphere around perishable products
AssigneeFurukawa International U.S.A., Inc.
InventorAlbert H. Myers
Life of this patent
Estimating the term…
Abstract
A perishable product is enclosed within a flexible bag and the air is evacuated from the bag to a predetermined pressure below atmospheric pressure. A predetermined volume of a gas is then introduced into the bag.
Claims14
A method for protecting perishable products comprising the steps of:
- sealing the product within an air-tight flexible bag;
- inserting into said bag a probe connected to a multi-position valve;
- moving said valve to a first position which connects said probe to a vacuum pump;
- evacuating air from said bag to a predetermined pressure below atmospheric pressure;
- moving said valve to a second position which connects said probe to a source of said gas;
- introducing a predetermined volume of gas into said bag by flowing a gas at a predetermined pressure into said bag for a predetermined time;
- moving said valve to a third position which closes the source of gas and vacuum to said probe;
- and
- withdrawing said probe from said bag.
6 more elements
An apparatus for protecting perishable products comprising:
- a flexible bag for enclosing the product;
- a probe for insertion into said bag after said bag is sealed;
- a hose connecting said probe to a multi-position valve;
- means for evacuating including a vaccum pump connected to said valve and open to said probe in one position of said valve for evacuating the air from within said bag to a predetermined pressure below atmospheric pressure;
- and
- means for introducing a gas including a source of gas at a predetermined pressure connected to said valve and open to said probe in another position of said valve, and timer means connected to said valve for controlling the length of time said valve is in said other position for introducing a predetermined volume of gas into said bag.
3 more elements
Dependencies are inferred from the claim text.