Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Reexamination Certificate
2005-06-28
2005-06-28
Wong, Edna (Department: 1753)
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
C053S141000, C053S400000, C252S188280
Reexamination Certificate
active
06911122
ABSTRACT:
A method for triggering an oxygen scavenging composition for use in packaging an oxygen sensitive article includes the steps of providing an oxygen scavenging composition comprising an oxidizable organic compound and, optionally, a transition metal catalyst, and exposing the composition to a source of pulsed light wherein each pulse has a duration of between 1 microsecond and 1 millisecond, a frequency of between 0.1 to 100 Hertz, and a total intensity of at least 350 mW/cm2so that each pulse provides the composition with a dose of UV light of at least 0.1 J/cm2so as to provide a triggered composition. The triggered composition can be applied to an article so as to provide an oxygen scavenging package. An apparatus and packaging system are also disclosed.
REFERENCES:
patent: 6449923 (2002-09-01), Cook et al.
patent: 6599487 (2003-07-01), Luthra et al.
patent: 2004/0081584 (2004-04-01), Dayrit et al.
patent: 520257 (1992-12-01), None
Dunn et al., “Pulsed-Light Treatment of Food and Packaging”, Food Technology, Sep. 1995, pp. 95-98.
Cook, Jr. Philip H.
Craddock Melania M.
Feehley William A.
Miranda Nathanael R.
Speer Drew V.
Cryovac Inc.
Quatt Mark B.
Wong Edna
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