1 year
20 years (Bangladesh Patents Act 2022)
If the patent is disclosed due to the display at the exposition or unintentional disclosure, the novelty grace period can be enjoyed within 6 months before the filing date/priority date.
no
no
- Authorization Fee: None
- Annuity: payable year by year starting from the 6th year from the date of application
no
6 months before the filing date/priority date.
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
DPDT only conducts formality examination of design patent applications, not substantive examination.