Petty Patent

Both protect inventions. A patent requires an inventive step. A petty patent requires novelty and industrial application only, so it is often the right route for a useful improvement that would not clear the inventive-step test.

Six years from the Thai filing date. It may be renewed twice, for two years each time, so the longest term is ten years.

No. Patent and petty patent are alternatives for the same invention. The applicant chooses one route. A pending application can, in the cases the Patent Act allows, be converted to the other route before grant.