Patent Puzzler

The answer to the last Patent Puzzler was the 1920’s for the aluminum bat.

Eclipse coming. Residents from California to Texas will get to experience a very rare astronomical event on October 14, 2023. A partial eclipse, commonly known as a “ring of fire” will be viewable. For Texas residents, you will be able to see the event for about 4 minutes from South Padre Island. To be able to view the eclipse, you should have special glasses. To this end, the Patent Puzzler this week relates to the special glasses that you need. What decade were they patented?

A) 1910’s

B) 1920’s

C) 1930’s

D) 1940’s