Article’s related to the release of patents on manufacturing synthetic abrasives
For those that may be interested in how synthetic abrasives were manufactured. Attached is an interesting article on the use of Litharge or Lead oxide filler as opposed to iron, zinc or chrome oxide in abrasives.
https://www.google.com/patents/US2083719
Feel free to click on some of the other patent listings “Referenced by Manufacturer” at the bottom of these articles.
Mike
https://www.google.com/patents/US211...weDNUQ6AEIKDAC
https://www.google.com/patents/US2308983