Patent tempered steel

Hi all!
Anyone have any info on dates of razors that have "patent tempered steel" on tang?
Best regards,
Gabe

Any other markings? Pics would be helpful for dating.

Attachment 230524

Will that pic do?

Looks like 1810's-1820's to me. Looks like an interesting tail shape too. Somebody smarter then me will be along to give you a better idea. Very nice razor.

Thanks B.J. ;)