The short answer
Patent registration in Bangladesh runs on fixed deadlines: 12 months to follow a provisional with a complete specification, 18 months to publication, 6 months of pre-grant opposition, 36 months to request examination and 24 months of post-grant challenge. Use this page as a deadline map.
Every deadline in one table
| Stage | Deadline | If missed |
|---|---|---|
| Complete specification after a provisional | 12 months | Provisional lapses |
| Foreign application details (Section 15) | At filing or within 90 days | Application may be deemed refused |
| Request for examination | 36 months from filing (+3 with surcharge) | Deemed abandoned |
| First publication | 18 months from filing (earlier on request) | n/a |
| Pre-grant opposition | After publication and before grant; no grant earlier than 6 months after publication | You can oppose until the patent is granted |
| Refusal notice | As soon as possible (Section 24(1)) | n/a |
| Post-grant opposition | Within 24 months of publication of the grant | Challenge route closes 24 months after the grant is published |
| INN for pharma inventions | 30 days from knowing it | Compliance risk |
Documents to prepare before filing
- Title, complete specification, claims, abstract and drawings
- Power of attorney if you file through an agent
- Inventor declaration and declaration of ownership in the prescribed format
- Certified priority document with English translation, if claiming priority
- Origin of any biological resource or traditional knowledge
Foreign applicants may be directed to adapt the description for readers in Bangladesh before grant.
What the examiner looks at
The DPDT checks that the file is complete, then searches for earlier publications or use in Bangladesh or abroad. You must show novelty, inventive step and industrial applicability.
Opposition: two chances to challenge
Before grant
Pre-grant opposition
Grounds include lack of novelty, non-patentable subject matter, public disclosure before filing, an undisclosed foreign filing, or false information.
After grant
Post-grant opposition
Grounds include an earlier priority claim, prior public use, lack of novelty or inventive step, inadequate claims, and false Section 15 information.
The Director General holds a hearing and issues a reasoned order. Strong technical and legal evidence usually decides the case.
Patent timeline questions
What happens if I miss the examination request deadline?
The application is deemed abandoned unless you use the 3-month extension with a surcharge.
When is my patent application published?
18 months after filing, or earlier if you request early publication and pay the fee.
Can anyone oppose my patent?
Any person can oppose before grant; any interested person can challenge after grant.
Need help with a patent in Bangladesh?
SUPREMEiP® drafts, files and prosecutes patents in Bangladesh for local and foreign applicants. Send us your invention summary.
