The use of trademarks and similar expressions in claims should not be allowed as it may not be guaranteed that the product or feature referred to is not modified while maintaining its name during the term of the patent. They may be allowed exceptionally if their use is unavoidable and they are generally recognised as having a precise meaning (see also F‑II, 4.14, with regard to the need to acknowledge trademarks as such in the description). With regard to the effect of references to trademarks on sufficiency of disclosure (Art. 83), see F‑III, 7.

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