Rapid evaluation of thin-film barrier coatings on thick substrat

Details Rapid evaluation of thin-film barrier coatings on thick substrat Rapid evaluation of thin-film barrier coatings on thick substrat

1996-09-30

1998-08-11

Williams, Hezron E.

Measuring and testing

With fluid pressure

Leakage

73 38, G01N 1508

Patent

active

057929408

ABSTRACT:
The present invention is directed to a method for measuring the shelf life of vacuum actuated tubes for blood sample collection, wherein the method comprises placing a collection tube in an apparatus having a first and a second sealable chamber, pressurizing the apparatus to a value above ambient pressure, and sealing both chambers such that each chamber has an identical pressure and is isolated from the other chamber. Leakage of gas into the collection tube located in the first chamber is detected as a differential pressure change relative to the second chamber. This change in pressure is recorded and is indicative of the rate of gas transport into the collection tube.

REFERENCES:
patent: 3921436 (1975-11-01), Plegat
patent: 4670847 (1987-06-01), Furuse
patent: 4675834 (1987-06-01), Furuse
patent: 4686638 (1987-08-01), Furuse
patent: 4811252 (1989-03-01), Furuse
patent: 5600996 (1997-02-01), Witschi

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