Slow examination and a strict view of what counts as distinctive. Precision in the specification is what keeps a Thai file from stalling for a year.
Petty patents register without substantive examination and suit incremental improvements. Full patent examination is slow, so file early and expect the grant to arrive well after launch.
Specifications must list goods precisely. A vague claim is the most common reason a Thai application drags.
Suggestive marks often need argument or a disclaimer to get through.
Customs recordal and market monitoring generally pay for themselves in this market.
With registration up to 20 months out, filing before market entry is not optional if you want cover on day one.