Hello, 3M patented cold flow breathing valve. Do you have a patent certificate, patent number and patent type?

I don't know if this is the invention patent you are looking for. The patent number is CN028 16565.9, which was granted on August 8, 2007.

In addition, 3M company filed a divisional application for the above invention patent with the patent number of CN2006 10 156295.7, which was authorized on June 20, 2007.