About 14-16 months after a Korean patent filing, the KIPO examiner takes up the case and — if rejection grounds appear — issues an office action under Patent Act Article 63. An OA is a signal that the application cannot be granted as is, but it is also the applicant's last clean window to amend and argue. How you respond often decides whether the same application becomes a granted patent or a final rejection.
What an office action is
Patent Act Article 63 requires the examiner, upon finding a rejection ground, to notify the applicant and grant a window in which to submit a response. An OA is therefore not a rejection — it is "these grounds may reject the application; here is your chance to amend or argue." The first OA is the initial rejection notice; if new grounds appear after the response, a final rejection notice may follow.
Four steps once an OA arrives
- Step 1: Read the OA carefully — identify the cited prior art and the exact statutory ground (Patent Act Art. 29 novelty/inventive step, Art. 42 enablement, etc.)
- Step 2: Classify the ground — judge whether the issue is fixable by claim amendment or by argument, or both
- Step 3: Draft amendment + response — claim/spec amendments paired with written argument explaining why they overcome the rejection
- Step 4: Pre-review or file — use the KIPO pre-amendment review before formal filing where applicable
Common rejection grounds
| Ground | Article | Typical response |
|---|---|---|
| Lack of novelty | Patent Act Art. 29(1) | Add limitations or argue distinguishing features |
| Lack of inventive step | Patent Act Art. 29(2) | Argue non-obviousness of combination / unexpected effect |
| Indefiniteness | Patent Act Art. 42(4)(2) | Define terms or sharpen claim language |
| Insufficient disclosure | Patent Act Art. 42(3) | Amend specification or align claim scope |
| Lack of unity | Patent Act Art. 45 | Restructure to a single invention or file divisional |
| First-to-file conflict | Patent Act Art. 36 | Distinguish from the earlier application or amend |
Amendment vs. argument — different roles
The amendment modifies the actual papers — claims, spec, drawings — typically by narrowing scope to dodge the rejection. The written argument (opinion paper) explains why those amendments overcome the ground, or why no amendment is needed. The two documents are usually filed together, with the relative weight depending on the rejection.
Inventive-step rejections often require both an amendment and a substantive argument; pure indefiniteness rejections may be cured by claim language alone with a brief opinion. The single biggest factor in OA outcome is how much amendment headroom you left in the spec at filing time — well-drafted specs make amendments easier to support.
Deadlines — Korea vs the US
The default Korean deadline is two months, extendable in one-month increments up to four times. Extension must be filed before the deadline expires; after expiry, only narrow restoration paths remain.
The USPTO standard is three months, extendable up to six with escalating fees. Korea and the US therefore start with different baselines and very different extension cost structures — multinational prosecution needs a single calendar that tracks both.
- Korea baseline
- 2 months Patent Act Enforcement Rule
- Korea extensions
- 4 × 1 month before expiry
- US baseline
- 3 months from mailing date
- US maximum
- 6 months with escalating fees
KIPO pre-amendment review
KIPO offers a pre-amendment review service: the applicant submits a draft amendment and the examiner gives an informal view on whether it overcomes the rejection. This sidesteps the "amend → new rejection → final OA" loop and significantly raises the chance of grant on the first round. Eligibility windows are limited, so coordinate with your attorney before relying on it.
When the final OA arrives
If new grounds appear after your response to the first OA, a final office action issues. Amendments at this stage are restricted (claim cancellation, narrowing, obvious-error correction), so the room for adding new limitations shrinks. That is exactly why claim narrowing in the first OA must be planned carefully.
If a rejection decision is issued despite a final-OA response, two paths remain: an appeal to the Patent Trial and Appeal Board or a re-examination request (introduced in 2009). A re-examination request must be filed within 30 days of the rejection decision and brings the case back to the same examination line — usually faster and cheaper than the appeal route.
Frequently asked questions
Do I always have to narrow the claims when an OA arrives?
No. If the cited prior art does not actually anticipate or render obvious your invention, you can respond with an argument-only paper (no amendment). Argument-only responses work best when supported by clear distinguishing features, unexpected results, or experimental data — not pure rhetoric.
Are deadline extensions automatic?
No — you must file a request before the deadline expires. Korea allows up to four 1-month extensions; missing the deadline normally means abandonment. For multinational prosecution, manage all jurisdictions on a single deadline calendar.
What benefit does a divisional filing give in OA strategy?
Splitting rejected claims into a divisional lets each application proceed on its own merit. The divisional inherits the original filing date but incurs additional fees, and the divisional must be filed within the windows where amendment is allowed — coordinate the timing and claim split with your attorney first.
Handle Korean OA responses with iphere
Initial and final office actions, pre-amendment review, divisional planning, and multi-country deadline tracking — handled in one workflow.