You sir are thinking of the "Tom Swift, Jr." series. There are only three that I believe that PG has cleared -- TS & His Giant Telescope, TS & the Electronic Hydrolung, and TS & the Visitor from Planet X. These were by Victor Appleton II (another house name.)
I read a bunch of these when I was a kid and remember being rather bored by them. The older ones were much better IMHO.
The original series ran from 1910 to 1941 so a lot of them are still locked away in copyright in the US. The "Jr." series ran from 1954 to 1971.
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