Ballard Power Systems Corporation

Horst Thumm

Emerson Richard Gallagher

Eric G Pow

Michael P Sexsmith

Donald A Lines

David Brown

Paul Po Hang Fong

Oliver Clemens

Nicholas A Fletcher

Bill Gray

An improved method for embossing expanded graphite sheet material including removing at least a portion of the gas from within the material by exposing the material to a pressure less than atmospheric pressure, and then embossing the material.

Method for embossing expanded graphite sheet material under reduced pressure

A process for impregnating at least one porous part with an impregnant is provided comprising: (a) immersing the porous part(s) in impregnant; (b) measuring at least one parameter indicative of the buoyancy of the porous part(s) as the impregnant impregnates the parts; and (c) interrupting impregnation when the measured parameter(s) indicates a predetermined level of impregnation is achieved. An apparatus for impregnating porous parts comprises a vessel for holding the porous part(s) and an impregnant, and a measuring device for measuring at least one parameter indicative of the buoyancy of the porous part(s) immersed in the impregnant within the vessel.

Control process for impregnating porous parts and apparatus therefor

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Vancouver, Canada

Horst Thumm