Part 1: In this, we should also include the aircraft division's former name of Hamburger Flugzeugbau. Espacenet has available thirty-two BV/HFB patents prior to the end of WWII, identifiable by the inventor as their Chief Designer Richard Vogt. Quite a few are small engineering gadgets, but there are some livelier aeroplane configurations among them. They also include a scattering of duplicate patents in other countries, mainly the UK and US:
Espacenet: free access to millions of patent documents. Find out if your invention is unique or if other inventors have filed patent applications that are considered to be prior art.
Part 2: Espacenet being what it is, "Vogt Richard" must be done as a separate query (a single suitably complex query confuses its search algorithms, boy they have some bugs in there). That brings up 16 results, most by other Richard Vogts in the US and Switzerland. However some are by the B&V designer, including a couple of French duplicates:
Espacenet: free access to millions of patent documents. Find out if your invention is unique or if other inventors have filed patent applications that are considered to be prior art.
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