Novelty grace period for utility model applications in Japan

5-7 months

yes. Within 3 years from the date of application, or within 3 months from the date of receipt of the rejection decision, the patent type can be changed from design to invention/utility model at the request of the applicant.

A conversion fee shall be paid for patent type conversion. Once the original patent application is converted, it will be deemed withdrawn.

20 years, and the validity period of patents for pharmaceutical inventions and pesticide inventions can be extended to 25 years upon application.

• Inventions under the via Paris Convention : 12 months from the earliest priority date.
• via Nationalization of PCT inventions: 30 months from the earliest priority date.

yes

The design does not lose its novelty if it is disclosed by the designer in Japan within 12 months from the filing date/priority date.

3-6 months

25 years

Reinstatement of priority on grounds of "due care" accepted.