Beyond the Prototype: Identifying commercially relevant variants in patent claims

Introduction : One of the most important aspects governing product claims is that there must be full disclosure of the product. What covers disclosure is a matter that must be looked into carefully by patent attorneys. When a product is released into the market, it goes through multiple stages, bearing different versions of the same product. The question that arises is whether all the alternatives need to be disclosed in the product claim or only the final version.

The answer depends on commercial business decisions of the inventor company. If multiple variants of the product can help them commercially then disclosure in the patent claim should include them. At the same time, a patent cannot claim monopoly over every future version of the product. Finding a balance becomes essential; especially since Indian law does not let an applicant fill the gaps later by adding new technical content. This blog talks about why inventor companies and patent attorneys should record different versions before filing and how broad the claims can be.

Legal Provisions

A. The Patents Act, 1970

Section 10(4) – This provision requires complete specification to fully and particularly describe the invention, its operation and method of performing. It must disclose the best method known to the applicant.

Section 10(5) – Claims need to be clear and succinct and should be based on the matter disclosed in the specification. Further provides that the complete specification should relate to a single invention or group of inventions to form a single inventive concept

Section 25(1)(g) and 25 (2)(g) – During the pre-grant and post-grant opposition, insufficient disclosure can be raised as one of the grounds in opposing the grant of patents.

Section 59(1) – This provision provides that no amendments can be made to any application for a patent if it relates to a matter that is disclosed or shown in the specification or any matter that does not fall within the scope of the claim.

Section 64(1)(h) – A patent may be revoked if the complete specification does not sufficiently and fairly describe the invention and does not disclose the best method of performing it.

B. Patents Rules, 2003

Rule 13 - Provides that if the invention requires explanation through drawings, such drawings need to be supplied and referred to in detail in the specification. This may include the different variants of drawings made for the final product.

Legal Analysis

A. Protecting technical elements, not the final prototype

The first step a patent attorney must consider in drafting the patent claim is identifying the technical elements. If an element does not contribute to solving a technical problem that the product aims to solve, it may not be necessary to include the same. This is because, including such an element in the claim will needlessly exclude any other alternatives that may be used instead. For example, consider a foldable laptop stand. The inventive contribution lies in the particular hinge mechanism that allows it to stand in an angle. The prototype may use an aluminium frame for the same. But if that frame does not lead to any technical contribution, and is included in the claim, it may unnecessarily exclude versions made from plastic or steel. At the same time, removing the hinge arrangement from the claim will result in a claim that is too broad. Therefore, it is essential to separate technical features from design choices.

B. Claim Breadth

Claim breadth refers to the scope of technological territory and legal protection defined in the patent claims. There are mainly two types; broad claims cover general concepts and broad categories whereas narrow claims target specific technical implementations. Commercial value of patents lies in the claim breadth, which makes it essential for patent attorneys to properly define its scope. The most sensible approach is to claim the common technical arrangement in reasonably general terms, and to place specific implementations in dependent claims.

C. Documenting alternative embodiments

For every commercially viable variant, the file should record the changes, working principle and new dimensions or conditions. The description should also clearly state that the preferred form is only an example, and other known other later-developed materials may be used. It shows that the invention is not limited to the example alone but it may also include other structures. It is also important to show which options are interchangeable and what materials must be used together. Therefore, every alternative that is commercial in nature needs to be described; drawings can be used to show different positions, descriptive texts may also be used.

D. The risk of adding new matter later on

Section 59(1) of the Patents Act, 1970 allows amendments only with what is revealed in the specifications provided in the patent claim. No new information can be added that goes beyond the scope of the complete specification. Therefore, if a variant exists for the product, but it was never described in the claim then it may not be added later on. If such a variant is commercially essential for the inventor company, then the Patent Attorney is advised to file a separate application, rather than trying to insert it in the earlier filing.

Relevant Case Laws

Nippon A&L Inc v Controller of Patents [C.A.(COMM.IPD-PAT) 11/2022]: In this case the Delhi High Court held that applicants are permitted to amend product-by -process claims into pure process claims. But it limited such amendments to fall within the scope of the complete specification filed. It held that the proposed amendments sought to narrow, rather than enlarge the protection. It further recognised that in cases of pre-grant amendments, the Patent Office need not assess them with unnecessary rigidity. However, it also restricts adding commercially viable inventions.

Allergan Inc. v. The Controller of Patents [2023/DHC/000515]: It is a landmark case relating to amendments. It involved the filing of a patent application for “method of treatment”, but was later modified to the claim being a product. It was later rejected by the Controller of Patents under section 59. The Delhi High Court in appeal, set aside the order and held that the composition of the implant claimed in the amended claims were specifically mentioned in the original claim. Hence, it falls within the scope and should be accepted. It recognised that patent law should be liberally interpreted to not discourage inventions.

Starpharma Pvt Ltd v. The Assistant Controller of Patents and Designs [Mad HC, (T) CMA (PT) No.22 of 2023]: The Madras High Court allowed amendment to applications made relating to the composition of gel formulation. It was held that the composition was already part of the original claim under the complete specification and hence it can be amended.

Fraunhofer Gesellschaft Zur Forderung Der Angewandten Forschunge v. The Controller General Of Patents Designs And Trade Mark & Anr [2026 LLBiz HC (CAL) 160]; In this case, the Calcutta High Court rejected the German Company’s patent application for a bioreactor method citing that the specifications have open-ended parameters and they failed to satisfy the material disclosure obligation. It reinforced the principle that replacing specific details with wide ranges and vague assertions can be rejected.

Practical Implications

Taking all of the above into consideration, it is understood that the Indian Courts view amendments to the patent claim valid only if such an amendment is within the scope of the original complete specification. Further, wide ranges without providing workable solutions can be rejected on the grounds of failing to materially disclose information. Therefore, it is vital for Patent Attorneys to keep in mind certain aspects relating to product variations before drafting the Patent claim.

Before filing the claim, the Patent Attorney needs to identify what parts of the product are technical in nature and whether substituting it with other alternatives derives commercial benefits to the inventor company. Each material, component, design, size changes must be tested to ask whether the working principle survives in each stage. Further, drawings, sketches and notes are vital in gathering evidence which can be included in the patent claim to identify different variants.

Another tactic that attorneys use is to call the preferred form as an illustration not as the invention itself. This way, it will be easier to include other alternatives. It is also essential to distinguish any kind of speculative ideas from technical embodiments that can be practically implemented. A concept that has not been built can still be disclosed if the method is described and a skilled person is able to achieve it.

Conclusion

A patent application should not be two-dimensional focusing only on the final prototype, it should look beyond and identify the different variants that can be mentioned. The key is balancing the disclosure obligations of the inventors with what aspects can be later on added through amendments under section 59. A clear distinction should be made between technical elements of the prototype backed by detailed descriptions as against speculative claims. This way, there will be scope for amendments that is acceptable to the Courts as well in later stages.

Essentially, before drafting the patent claim, a Patent Attorney must involve the research, production and regulatory teams to properly identify the core mechanism and record the roadmap of every model created. This will bring clarity in drafting and preserving inventive ideas by identifying the alternatives. All of this will be backed by the original specifications. Therefore, creating a product-roadmap checklist can help businesses capture commercially relevant variations.

Author :- Vaishnavi Kulkarni, in case of any query, contact us at Global Patent Filing or write back us via email at support@globalpatentfiling.com.

Endnotes

1. Patents Act, 1970, ss. 10(4), 10(5), 25(1)(g), 25(2)(g), 59(1), 64(1)(h)–(i) (India); Patents Rules, 2003, r. 13 (India).
2. Global Patent Filing, Drafting Patent Claims Around a Product’s Commercial Variants (Oct. 22, 2026), https://www.globalpatentfiling.com/blog/drafting-patent-claims-around-a-product-commercial-variants  (reporting Nippon A&L, Allergan and Fraunhofer).
3. Neha Manoria & Shivani Shrivastava, Sufficient Disclosure in Patent Specifications: The India Perspective, Asia IP (Oct. 31, 2020), https://asiaiplaw.com/sector/patents/sufficient-disclosure-in-patent-specifications-the-india-perspective. 
4. Sonal Mishra & Antriksh Mishra, Meeting Sufficiency of Disclosure Requirements Under the Indian Patent Act, 1970, L.S. Davar & Co., Mondaq (Dec. 8, 2021), https://www.mondaq.com/india/patent/1139820/meeting-sufficiency-of-disclosure-requirements-under-the-indian-patent-act-1970. 
5. Matthew Kinnier & Emily Dubuc, Breadth through Specificity: Supporting Alternative Embodiments with Multiple Examples in Patent Applications, IPWatchdog (July 21, 2017), https://ipwatchdog.com/2017/07/21/breadth-specificity-supporting-alternative-embodiments-multiple-examples-patent-applications/. 
6. Joseph Root, Patent Drafting: Include Alternatives and Variations to Claim Limitations, IPWatchdog (Aug. 26, 2014), https://ipwatchdog.com/2014/08/26/patent-drafting-include-alternatives-and-variations-to-claim-limitations/. 
7. Nippon A&L Inc v Controller of Patents [C.A.(COMM.IPD-PAT) 11/2022]
8. Starpharma Pvt Ltd v. The Assistant Controller of Patents and Designs [Mad HC, (T) CMA (PT) No.22 of 2023
9. Allergan Inc. v. The Controller of Patents [2023/DHC/000515
10. Fraunhofer Gesellschaft Zur Forderung Der Angewandten Forschunge v. The Controller General Of Patents Designs And Trade Mark & Anr [2026 LLBiz HC (CAL) 160