6 months before the filing date/priority date.
no
Inventions under the via Paris Convention : 12 months from the earliest priority date.
2 years
no
20 years (Bangladesh Patents Act 2022)
DPDT conducts formality examination and substantive examination of invention patent applications. The substantive examination starts automatically, and the applicant does not need to file a separate request for substantive examination. If the conditions for patent granted are met, the patent application will enter the public stage. If there is no objection within 4 months after publication, the patent application will be authorized.
- Grant fee: The applicant shall pay the granted official fee within 2 months after receiving the granted notice.
- Annuity: It needs to be paid year by year starting from the fifth year from the application date.
- Authorization Fee: None
- Annuity: payable year by year starting from the 6th year from the date of application
no
via Paris Convention : 6 months from earliest priority date.