Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Reexamination Certificate
2006-08-22
2006-08-22
Silverman, Stanley S. (Department: 1754)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
C502S302000, C502S305000, C502S325000, C502S340000, C502S344000, C502S349000, C502S353000, C502S355000, C502S514000, C502S527120
Reexamination Certificate
active
07094728
ABSTRACT:
Disclosed herein is a method of distributing a washcoat along channels of a particulate filter substrate, the method including: forcing a washcoat slurry a predetermined distance into the channels, the predetermined distance being less than or equal to the full length of the channels; clearing an excess amount of washcoat slurry from the channels; and arranging a remainder of the washcoat slurry within the channels, the arranging including applying a first vacuum to a first end of the particulate filter substrate after the clearing. In one embodiment the clearing includes applying a second vacuum to a second end of the particulate filter substrate. In another embodiment, the clearing includes pulling the excess washcoat slurry from the channels. The predetermined distance may be less than or equal to the full length of the channels. The arranging may provide a layer of a washcoat composition comprising a catalytically active material arranged anisotropically along a length of the channels of the particulate filter substrate.
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Reid Scott F.
Wei Ming
Yan Jiyang
Delphi Technologies Inc.
Marshall Paul L.
Silverman Stanley S.
Vanoy Timothy C.
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