Really, that's surprising.
I wouldn't think you could get s Utility Patent on a grid pattern, and have the claim be so broad that others couldn't sell and manufacture grids?
Grids for lights have been in use for so long now, Many Patents would be public domain.
Maybe a Design Patent? But Design Patents are typically very specific and thus easier to work around.
Anyway not trying to start an argument or anything, just find it interesting.
Toby




