Thanks for your feedback.

Most manufactures are using manufacture dates and NOT expiration dates.

However, most of us don't have to worry about expiration dates, because old respirators have been used up by now. An old expired respirator is very rare to find.

Having said that JAMA published a research study that stated that expired N95 were still fine to use during COVID19.

https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2769443?utm_campaign=articlePDF&utm_medium=articlePDFlink&utm_source=articlePDF&utm_content=jamainternmed.2020.4221

As for Accumed, I can't comment on them as I know nothing about them or their operation.

Take care and stay safe.