What are the requirements for the Bulgarian invention patent application documents

yes. Designs in the same category, or belonging to the same set or combination of articles, may contain several designs in one design (this condition does not apply when the product containing or attached to the design is an ornament).

Reinstatement of priority on grounds of "due care" and "unintentional/due care" accepted.

• Grant fee: It must be paid together with the granted announcement fee within one month from the receipt of the granted notice.
• Annuity: pay year by year from the first year of the application date, and should be paid before the last day of the month of the application date at the latest, not exceeding one patent year, and the annual fee can be paid within a grace period of 6 months if it is overdue, and paid at the same time 200% late fee.

20 years

no

1 month

• Grant fee: The applicant shall pay the granted fee within 3 months after receiving the granted notice.
• Annuity: pay year by year from the first year of the application date, and should be paid before the last day of the month of the application date at the latest, not exceeding one patent year, and the annual fee can be paid within a grace period of 6 months if it is overdue, and paid at the same time 200% late fee.

• via Paris Convention : 12 months from earliest priority date.
• via Nationalization of PCT : 31 months from earliest priority date.

4-6 months

• via Paris Convention : 6 months from earliest priority date.
• The way of the Hague Agreement: The Hague Agreement will automatically take effect in Bulgaria after 6 months from the registration of the Hague Agreement.
• EU appearance route: 6 months from the earliest priority date.