> Immediately after the maintenance, users will only be able to access Public PAIR through URLs beginning with HTTP, such as http://portal.uspto.gov/pair/PublicPair. Past URLs using HTTPS to access Public Pair, such as https://portal.uspto.gov/pair/PublicPair, will no longer work.

So it seems that the maintenance will turn of HTTPS, not that it's unavailable during the maintenance.

I don't think you read the whole thing.

> Immediately after the maintenance, users will only be able to access Public PAIR through URLs beginning with HTTP, such as http://portal.uspto.gov/pair/PublicPair. Past URLs using HTTPS to access Public Pair, such as https://portal.uspto.gov/pair/PublicPair, will no longer work.

I think that's the maintenance period, after which https won't be available.

Immediately after the maintenance, users will only be able to access Public PAIR through URLs beginning with HTTP, such as http://portal.uspto.gov/pair/PublicPair. Past URLs using HTTPS to access Public Pair, such as https://portal.uspto.gov/pair/PublicPair, will no longer work.

> During the maintenance period, Public PAIR will be unavailable.

> Immediately after the maintenance, users will only be able to access Public PAIR through URLs beginning with HTTP,