I just noticed you already had the information from that obituary.
I went to the Houlton web site, and it looks like you can e-mail the Town Clerk.http://www.houlton-maine.com/contact.php
I searched on-line for Adrian Bates and found mention that he died in 1969, so was in his 60's.http://www.death-record.com/d/n/Adrian-Bates/Maine
In case some don't know, you get better results when searching on-line if you put the search-term inside quotation marks. For example, "Adrian Bates, Maine"
Betty (near Lowell, MA)
P.S. If the family basically stayed in Houlton, the Town Clerk should be able to do some look-ups for you. (I have better results from writing a formal letter to Town Clerks or City Clerks.