Setec Astronomy
Active member
I notice there seem to be a lot of Grit Guard imitators all of a sudden, which made me wonder if there had been a patent on it which had run out. Sure enough: US7025880B2 - Fluid receptacle and filter system
- Google Patents
Funny how when the clay patents expired, not much changed, I guess because of fallout removers and clay substitutes, not too much interest in clay anymore.
- Google Patents
Funny how when the clay patents expired, not much changed, I guess because of fallout removers and clay substitutes, not too much interest in clay anymore.