GERMAN chemicals giant BASF has been frustrated in its bid to secure a new supplementary protection certificate for its longstanding pesticide ingredient chloridazon, which would have erected fresh legal barriers for rivals wanting to use the chemical.

The company had applied for the certificate at the Dutch Industrial Property Office, on the basis of a comparatively new market approval, secured for a chloridazon product in 1987, (the first had been issued in 1967).

Its application was rejected; the office claimed that the ...

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