Section 4 of the Patents Act, 1970
Inventions relating to atomic energy not patentable
Bars patents for inventions relating to atomic energy that fall within the Atomic Energy Act's controlled subject matter.
Official legal text
The verbatim statutory text of this provision is reproduced from the official source and checked by our legal reviewer before it is published here. Until that check is complete for this page, read the exact wording directly from the official source linked below — it is the only version that governs.
This explanation is written for clarity, not for citation. The official statutory text and any Gazette notification in force on your date govern, and they prevail over anything said here.
What this section says, in plain language
Section 4 is a short but absolute bar. It says that no patent shall be granted for inventions relating to atomic energy which fall within a specified sub-section of the Atomic Energy Act, 1962. Where Section 3 excludes subject matter for reasons of policy about knowledge and public interest, Section 4 excludes it for reasons of national security and state control over nuclear material and technology.
The reach of the bar is set by the Atomic Energy Act, not by the Patents Act. That statute empowers the Central Government to control inventions relating to the production, control, use or disposal of atomic energy, and to the prospecting, mining, extraction, production, treatment or use of prescribed substances such as uranium, thorium, plutonium, beryllium and certain rare earths. If an invention falls inside that controlled field, patent law simply steps aside.
In practice the Patent Office does not decide the nuclear question by itself. Applications that appear to touch atomic energy or prescribed substances are referred to the Department of Atomic Energy for its view. If that department confirms the subject matter is covered, the application cannot proceed to grant, and the objection cannot be overcome by amending claim wording alone. If it is not covered, examination continues normally on the usual grounds.
The bar is not a general ban on nuclear-adjacent engineering. Many inventions used near the sector, such as radiation-shielding materials for hospitals, industrial imaging equipment, or general instrumentation, sit outside the controlled field and are examined like any other application. The question is always whether the invention falls within the controlled subject matter as defined by the Atomic Energy Act, and that is a technical and legal assessment, not a guess based on the field name.
Related provisions deal with the same concern from other directions. Section 65 allows revocation or amendment of a patent on a direction from the Government where the invention turns out to relate to atomic energy. Section 157A allows the Government to protect the security of India. Together these show that the atomic energy restriction operates both at the gate and after grant.
Why this section matters
Researchers and companies working on nuclear technology, prescribed substances, isotopes, fuel cycles and closely related processes.
At the point of deciding whether to file at all, and during examination when the application is referred for a departmental view.
An absolute prohibition on grant for the covered subject matter, and a referral mechanism during examination.
Time and fees are lost on an application that cannot be granted, and sensitive material may be disclosed in a specification that will never yield a right.
How it works in practice
A fuel-cycle process that could not be patented
Dr Rohit Meena, a materials researcher at a national laboratory in Rajasthan, develops a leaner method of separating a thorium compound during fuel preparation. His institute's technology transfer office is enthusiastic and files a patent application describing the process and the reagents used. During examination the Patent Office identifies the subject matter as touching a prescribed substance and refers the application to the Department of Atomic Energy. The department confirms that the process falls within the controlled field. The application cannot proceed to grant, and no amendment of the claims will change that, because the bar attaches to the subject matter itself rather than to the way it is claimed. Rohit's institute changes course. It handles the process as controlled technical information under its agreement with the department, and separately files on a general-purpose corrosion-resistant valve seal his team designed along the way, which has ordinary industrial uses and sits well outside the controlled field.
Simplified illustration only. Actual legal outcomes depend on the facts.
Key points to remember
- No patent can be granted for inventions relating to atomic energy that fall within the controlled subject matter of the Atomic Energy Act, 1962.
- The scope of the bar is defined by the Atomic Energy Act, not by the Patents Act.
- Applications touching this field are referred to the Department of Atomic Energy for its assessment.
- The objection goes to subject matter, so claim amendment alone cannot cure it.
- Inventions merely used near the nuclear sector are not automatically caught; the test is whether they fall within the controlled field.
- Section 65 allows revocation or amendment after grant if the invention is later found to relate to atomic energy.
Common mistakes and misunderstandings
- Assuming anything involving radiation or isotopes is barred. Many such inventions fall outside the controlled subject matter and are examined normally.
- Thinking a careful claim rewrite can escape Section 4. The bar attaches to what the invention is, not to how it is worded.
- Believing the Patent Office decides the nuclear question alone. The Department of Atomic Energy's view is central.
- Assuming that once a patent is granted the issue is closed. Section 65 lets the Government seek revocation or amendment later.
Connected provisions
- ActSection 3What are not inventions
- ActSection 35Secrecy directions relating to inventions relevant for defence purposes
- ActSection 39Residents not to apply for patents outside India without prior permission
- ActSection 65Revocation of patent or amendment of complete specification on directions from Government in cases relating to atomic energy
- ActSection 157AProtection of security of India
This page explains a section of the Patents Act, 1970. The working detail that goes with it lives in the Patents Rules, 2003. The connected rules appear in their own block so that the statutory duty and the procedural steps stay clearly distinguishable when you cite either one.
Forms, deadlines and fees
The official fee for anything described on this page is set out in the First Schedule to the Patents Rules. It is not the same for every applicant, and it is not the same for online and physical filing, which is why no amount is stated here. How Indian patent fees work.
Related judgments
Court decisions shape how this provision is applied, but a summary is useful only if it is right. Every case note on this site is read by a legal reviewer before it goes live, and none has been completed for this provision so far. This section will fill in as those reviews finish. How case notes are prepared.
Questions people ask about Section 4
Why are atomic energy inventions not patentable in India?
Because the State keeps control over nuclear technology and prescribed nuclear substances for reasons of national security and public safety. The Atomic Energy Act, 1962 gives the Central Government wide powers over inventions in this field, and Section 4 of the Patents Act refuses to grant private monopolies over the same subject matter. The policy is that such technology should be handled through government control and licensing rather than through exclusive private rights that could be traded freely.
How does the Patent Office decide if Section 4 applies?
Examiners flag applications that appear to relate to atomic energy or to prescribed substances such as uranium, thorium, plutonium, beryllium and certain rare earths. The application is then referred to the Department of Atomic Energy, which assesses whether the subject matter falls within the controlled field. Its assessment effectively decides the point. If the answer is yes, the application cannot be granted. If it is no, examination proceeds on the ordinary grounds of novelty, inventive step, industrial application and Section 3.
Can a patent be revoked later for relating to atomic energy?
Yes. Section 65 provides that where the Central Government is satisfied that a patent relates to atomic energy, it may direct the Controller to revoke the patent or to require amendment of the complete specification. So the restriction does not end at the examination stage. A patentee whose technology drifts into the controlled field through later development should treat this as a live risk rather than a closed question.
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