no
6 months before the filing date/priority date.
- Authorization Fee: None
- Annuity: payable year by year starting from the 6th year from the date of application
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.
no
no
via Paris Convention : 6 months from earliest priority date.
DPDT only conducts formality examination of design patent applications, not substantive examination.
Inventions under the via Paris Convention : 12 months from the earliest priority date.
no
20 years (Bangladesh Patents Act 2022)