I tried to search specific nomenclature for the designs from Obrienblamblam's chart post to no avail. While 'ducted fan' and 'four post ducted fan' bring up some aircraft, I have not found many of the designs.
These are Design Patents. As such, the patent contians naught but the basic drawings... and has a very basic title. For instance, as memory serves, both of these patents were titled "Aircraft."
I'm finding google Patents to be both very useful... and very limitted. One patent that I had a photocopy of (from the Denver public library, pre-Web days of manual searching of microfilm) was a Bell Aircraft patent for a VTOL tailsitter fighter from WWII; I had misplaced the copies, and decided to use Google to hunt it down, based on the few snippets of info that I could recall. A few days of searching failed to turn it up. I finally located the paper copy, and then went back to Google: even with a patent number search... Google couldn't find it. The patent office server had the patent, but Google does not. Strange. I can only assume that there are a *lot* of gaps.