This patent was owned by my Uncle, Albert Floyd Old. Which now has passed away. I was interested in who is the owner now?
No one owns it. This patent was issued on Jun 19, 1962. It would have expired in the 1970's.
You can easily search for patents on Google Patents using their publication number.
See Google.com/patents/us3039165 (it even has a link to this page):
Method and apparatus for production of lightweight aggregate from dust
Publication number: US3039165 A
Publication type: Grant
Publication date: Jun 19, 1962
Filing date: Apr 28, 1954
Priority date: Apr 28, 1954
Seems like it used to be owned by Solite Corp, but old patents expire 17 years after grant or 20 years from filing, whichever greater. This means that everyone has been free to use it since 1979.