Sliding door locks.
following info on the handle.
Canadian patient no.919213
patiented 1973
Pat. no.3596954
Hello,
thanks for your post! Your patio door handle set reminds me of the 82-032 White Handle Set. Although, you'll need to double check the distance between the installation holes to confirm that it is a match.
To convert this to keyed handle set, you'll need the 82-310 Key Lock. There is a tutorial, tagged below, with instructions on how to install it in a handle set.
The mortise lock appears to be a match for the 82-244 Patio Mortise Lock and Keeper set. To confirm that this is the right replacement, be sure to compare its specifications. This is sold separately from the handle set.
You'll find the specifications for all three parts on the website.
Thsnks.