Stock material or miscellaneous articles – Hollow or container type article – Nonself-supporting tubular film or bag
Reexamination Certificate
2007-01-30
2007-01-30
Ryan, Patrick Joseph (Department: 1772)
Stock material or miscellaneous articles
Hollow or container type article
Nonself-supporting tubular film or bag
C428S034700, C428S137000, C428S315900, C428S447000, C428S500000, C426S106000, C426S118000
Reexamination Certificate
active
09976987
ABSTRACT:
Novel gas-permeable membranes which are particularly useful in the packaging of fresh cut fruit and vegetables, and other respiring biological materials. The membranes have an O2permeability of at least 775,000 ml/m2.atm.24 hrs, a P10ratio of at least 1.3, and a ratio of CO2permeability to O2permeability (R) of at least 1.5, and are made by forming thin polymeric coatings on microporous polymeric films. Preferred coating polymers are side chain crystalline polymers. Preferred microporous films contain inorganic fillers, particularly such films based on ultrahigh molecular weight polyethylene or polypropylene. FIG.1illustrates how O2permeability and R ratio vary for different coating polymers and microporous films.
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Clarke Raymond
McClary Bradley
Schultz Donald A.
Stewart Ray F.
Yoon Valentine Y.
Landec Corporation
Rhee Jane
Ryan Patrick Joseph
Sheldon & Mak PC
LandOfFree
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