The answer is that public recordation of a patent assignment is not required for the assignment to be a valid transfer of ownership. See, e.g., this discussion in the Manual for Patent Examination Procedure:
Recordation of the assignment provides legal notice to the public of the assignment. It should be noted that recording of the assignment is merely a ...
This patent was originally assigned to Ermin Devito of Green Brook, New Jersey, and was never reassigned (see USPTO Assignment database). However, a note from the USPTO database:
Disclaimer: Assignment information on the assignment database reflects
assignment documents that have been actually recorded. If the
assignment for a patent was not recorded, ...
On Google Patents, note that the Original Assignee is "Roblox Corporation". From an WSJ blog in 2013:
Roblox raised about $7.2 million from investors including Altos
Ventures and First Round Capital
So, no, there does not appear to be any association with LEGO. This is a US company based in San Mateo, California.
For completeness, if you check the ...
For a patent that old, you will probably be able to find the information in the Official Gazette of the United States Patent Office. Look for "Abram N Pasman, assignor to" in association with the patent number and title, "2,038,852 Sink strainer".
There is no guarantee that the invention was ever manufactured and sold, but the assignor is the place to start....
Patent sale date can be determined in following ways:-
Check the respective patent office Patent Register e.g. US patent USPTO Assignment Database
Check online News Articles or Press releases.
Contact the attorney of the Application
Contact the inventor/applicant of the application
Now to query you cannot find it in online database as case is too old and ...
The overall field is called patent analytics. Academics do quite a bit of it. One site that has some useful tools is see-the-forest. I am including a chart I just made there. Unfortunately to get really useful data you need to be a paid user.