IP Case Law › Patents › Sulzer Mixpac AG v. Assistant Controller of Patents and Desi…
Relevant Acts and provisions
Patents Act, 1970
Section 2(1)(j)Section 2(1)(ja)
Provisions considered: Sections 2(1)(j) and 2(1)(ja) of the Patents Act, 1970 (as amended).
Brief facts
The Appellant applied for a patent for an invention titled 'Static Mixer', a device used to mix molten polymers by pushing them through a series of installation bodies inside a tube. Sulzer claimed its invention was a major improvement because it used a common bar element to connect more than five installation bodies together, making the mixer stiffer, longer and less prone to breakage. The Controller rejected the application, ruling that it lacked an inventive step, arguing that the idea was obvious because prior art, including Sulzer's own older patents, already showed how to connect parts using bars to increase strength. A Single Judge of the High Court dismissed Sulzer's first appeal, leading to the present case before a Division Bench.
Issues before the Court
- Did the use of a common bar element to connect more than five installation bodies involve a real inventive step?
- Was the invention already anticipated or made obvious by the technical features found in prior art documents D1 to D4?
- Does simply increasing the number of parts connected by a known strengthening technique constitute a patentable advancement?
Court's findings
The Court observed that prior art D1 specifically taught that connecting adjacent installation bodies increases bending stiffness, and noted that D1 even mentioned mixers made up of 12 installation bodies, which suggested that Sulzer's new idea was already part of existing technical knowledge. The Court noted that standardising a known component to perform the same function it did in older designs is not enough for a patent; an invention must offer a technical advance that is not obvious to a person skilled in the art. It held that the claimed arrangement constituted a mere modification of the disclosures and teachings already available in the prior art, and that replacing the reinforced strip with a bar element to connect multiple installation bodies would have been obvious to a person skilled in the art.
Decision
The Division Bench upheld the decision of the Controller.
Key legal principle / ratio
Adjudication under the Patents Act has to be guided by the statute rather than by a mechanical, step-by-step application of judicial formulas. A patent decision cannot be overturned or deemed invalid solely because it did not strictly list or execute the five-step sequential obviousness test in Hoffmann-La Roche Ltd. v. Cipla Ltd. in exact order, provided that the substance of the inventive step inquiry has been substantively and properly evaluated. The Division Bench clarified that the five steps are guidelines and not mandatory commandments.
Cases cited
- Hoffmann-La Roche Ltd. v. Cipla Ltd., 225 (2015) DLT 391 (DB)
Authorities referred to in the decision. Please verify each citation in the judgment itself.
Keywords
Common Bar Element Installation Body Inventive Step Obviousness Prior Art Static Mixer
Read the judgment
More Patents judgments
Patents
Array Biopharma Inc v. Deputy Controller of Patents and Designs
A combination of distinct and independent active drugs, each with its own chemical identity and mechanism, does not fall under the Section 3(d) bar for derivatives of known substances. Using phrases such as 'for simultaneous, sepa…
Inventive StepMethod of TreatmentPharmaceutical CombinationPrior ArtPatentsDeepak Nitrite Limited v. The Assistant Controller General of Patents and Designs
It is wholly impermissible for the Controller, while exercising quasi-judicial powers under Section 15, to rely upon 'common general knowledge' as a self-sufficient ground for refusing a patent application without setting out and …
Common General KnowledgeFood Grade Sodium NitriteFree-FlowingImpurity ProfilePatentsIntra-Cellular Therapies, Inc. v. The Controller of Patents
Although the deuterated compound demonstrated approximately 72% higher parent-drug exposure in the blood, the comparative studies showed substantially similar pharmacological activity between the deuterated and non-deuterated comp…
Deuterated CompoundsHeterocycle-fused Gamma-carbolinesParent Drug ExposurePharmacological Activity