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Can any one tell me if it is possible to have the patent dates remarked.

dfariswheel

There are firearms restoration experts who restore stamps.
Since the original dies are long gone, the only practical way of doing it is to have the stamps refreshed by hand engraving.

Some experts have had original type dies made, but getting s die perfectly registered with the original stamp is extremely difficult and doesn't always work well, thus the hand engraving.

THE top expert on firearms restoration is the Doug Turnbull company.
They're generally considered to be the best in the world, and can match old finishes like color case hardening and bluing, wood finishes, and stamps.
Prices are steep but the work is world class.
Since this type of work is usually a matter of a "one-off" job, you have to talk to them about what you want and how they'll do it.

https://www.turnbullrestoration.com/

Some people think Ron's is a good restoration service but I don't know about refreshing stamps. Contact him for info.

https://www.ronsgunshop.com/

There are no doubt others around but Turnbull is the best and you get no botched work from them.

Since most any really competent expert engraver can do remarking work, you might contact Baron Tech about this....

Baron Technology | Engraving At Its Finest

If you decide on having an engraver do it, be very careful who you pick. Not everyone working as an engraver is a firearms engraver, and not every firearms engraver is worth a damn.
If you go with an engraver, check his reputation with the American Engravers Guild.

Firearm Engravers Guild Home Page