Vented vial stopper for processing freeze-dried products
First Claim
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1. A device for sealing and venting a freeze-drying container that comprisesa sealable core adapted to seal an opening in the container, the core having at least one passageway therethrough;
- a membrane of expanded polytetrafluoroethylene, the membrane being resistant to liquid penetration and permeable to moisture vapor, the membrane being adhered to the core so as to serve both as a barrier to liquids passing through the passageway and as a protective covering to the core;
wherein moisture vapor within the container vents through the membrane and the passageway to outside the container during the freeze-drying process; and
wherein the membrane protects resilient core against chemical attack and adhesion to the container.
3 Assignments
0 Petitions
Accused Products
Abstract
An vented vial stopper for use in processing freeze-dried products is provided. The stopper includes a vent passageway that is covered with a waterproof and moisture vapor permeable membrane to allow the venting of moisture during the freeze-drying process. The membrane also extends to cover most or all of the exposed surface of the stopper to protect the stopper from chemical attack during processing.
60 Citations
4 Claims
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1. A device for sealing and venting a freeze-drying container that comprises
a sealable core adapted to seal an opening in the container, the core having at least one passageway therethrough; -
a membrane of expanded polytetrafluoroethylene, the membrane being resistant to liquid penetration and permeable to moisture vapor, the membrane being adhered to the core so as to serve both as a barrier to liquids passing through the passageway and as a protective covering to the core; wherein moisture vapor within the container vents through the membrane and the passageway to outside the container during the freeze-drying process; and wherein the membrane protects resilient core against chemical attack and adhesion to the container. - View Dependent Claims (2, 3, 4)
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Specification
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Current AssigneeW. L. Gore & Associates (W.L. Gore & Associates)
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Original AssigneeW. L. Gore & Associates (W.L. Gore & Associates)
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InventorsGeorge, Nelson A., Zingle, Ralph D.
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Primary Examiner(s)Bennett, Henry A.
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Assistant Examiner(s)DOSTER GREENE, DINNATIA JO
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Application NumberUS08/554,054Time in Patent Office449 DaysField of Search34/92, 34/242, 34/284, 34/287, 34/296, 34/297US Class Current34/296CPC Class CodesF26B 5/06 the process involving freezing
