One interview at hiring fair held specifically for this position, hosted by USPTO at local hotel. Hiring managers gave presentation, met with each candidate individually. I was asked which tools I'd used for patent-related research, to elaborate on my experience and ability to work alone (job requires extensive solo work), describe expertise/ability to determine if a submitted design will function or is technically accurate. Hiring managers very open, revealing. Culture appears similar to NASA or a department office at a research university: Laid back academic yet professional interactions.