Receptacles – High-pressure-gas tank
Reexamination Certificate
2006-04-04
2006-04-04
Langel, Wayne A. (Department: 1754)
Receptacles
High-pressure-gas tank
C216S052000, C216S053000, C216S099000, C216S100000, C423S406000, C423S415100, C423S439000, C423S481000, C423S483000, C423S491000, C423S492000, C423S494000, C423S500000
Reexamination Certificate
active
07021487
ABSTRACT:
A metal container to be filled with a halogen containing gas, with the inner surface processed with a polishing agent. The gas has a reduced purity decline by the increase of the water content or impurities from the inner surface of the container which is absorbed by the gas over the passage of time. The inner surface processing method is improved such that the value of dividing the area of the Si2s peak by the area of the Fe2p3/2peak in the X-ray photoelectron spectrum of the gas container inner surface with the inner surface process with a polishing agent applied is 0.3 or less.
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Harada Isao
Kanayama Shigeo
Kikkawa Akio
Buchanan & Ingersoll PC
Langel Wayne A.
Mitsui Chemicals Inc.
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