Agrochemical development frequently involves incremental technical work. Solvents are substituted, concentrations adjusted, surfactant systems modified, crystal forms improved and known compounds tested in different combinations. Many of these changes form part of routine formulation work. Others may produce a technical advance capable of patent protection.
The distinction is central to the requirement of inventive step.
Under the South African Patents Act, an invention must be new, involve an inventive step and be capable of use or application in trade, industry or agriculture. An inventive step is absent where the development would have been obvious to a person skilled in the relevant art having regard to the state of the art before the priority date.
South African courts have developed the enquiry through cases including Roman Roller CC v Speedmark Holdings and Ensign-Bickford v AECI Explosives and Chemicals. The assessment requires identification of the inventive concept, consideration of the relevant prior art, examination of the difference between that prior art and the claimed invention, and an evaluation of whether the development would have been obvious to the skilled person.
In agrochemical matters, the answer often depends heavily on the underlying chemistry and the predictability of the outcome.
A straightforward substitution of one known solvent for another may fall within routine optimisation where the alternative was already recognised as suitable for the same purpose. Changes in concentration or the use of established formulation components may present similar difficulties where the technical result could reasonably have been anticipated.
A different position may arise where the development produces an unexpected technical effect. A particular formulation may demonstrate materially improved stability, a combination may achieve an efficacy profile not predicted by the performance of its individual components, or an apparently modest change may solve a technical problem that had resisted conventional approaches. A modified crystal form may result in increased efficacy establishing the same result at relatively lower dosages.
The strength of any subsequent patent position will depend not only on the result but also on the evidence explaining the technical contribution.
Contemporaneous development records can therefore be valuable. Laboratory results, comparative testing and documentation of unsuccessful approaches may assist in demonstrating why a particular development was not merely an obvious routine progression from what was already known. The context in which the invention arose can be difficult to reconstruct accurately once the development programme has moved on.
The timing of patent advice is equally relevant. Information made available to the public before filing can affect novelty and inventive step, depending on the circumstances, the patentability of the development. Discussions between technical teams and patent practitioners should therefore take place before publication, conference presentation, commercial disclosure or other release of potentially significant research.
This does not mean that every improvement arising in a formulation programme warrants patent protection. Routine optimisation remains part of ordinary scientific development. The more valuable exercise is to identify those developments that depart materially from what the skilled person would have expected or predicted and to assess their patent potential while the supporting technical evidence is still available.
For agrochemical businesses, closer integration between research and patent strategy can improve both the identification of protectable inventions and the quality of the resulting patent position.
KISCH IP advises research and development teams on inventive-step assessment, patentability and the protection of chemical and formulation innovation.
