Q. I'd like to know what the type of metal was used to make the metal filter used on the Corning Glass Teapots filters Pat. No. 2204158? Thank you!

I've looked into your question about patent 2204158, but have not been able to find any information on the specific type of metal used to make the filter. You might want to try contacting Corning Inc. (in particular, their archives department), to see if they have any further information.