20 CAP. 506 Trade Marks [Rev. 2009 words, all rights of the proprietor, whether under the common law or by registration, to the exclusive use of the trade mark in relation to the article or substance in question or to any goods of the same description or of the activity in question; or (ii) if the trade mark contains that word or those words and other matter, all such rights of the proprietor to the exclusive use of that word or those words in such relation as aforesaid, shall be deemed to have ceased on the date at which the use mentioned in paragraph (i) of the proviso to subsection (1) first became well known and established, or at the expiration of the period of two years mentioned in paragraph (ii) of that proviso. (3) No word which is the commonly used and accepted name of any single chemical element or single chemical compound, as distinguished from a mixture, shall be registered as a trade mark in respect of a chemical substance or preparation, and any such registration in force at the commencement of this Act or thereafter shall, notwithstanding anything in section 16, be deemed for the purposes of section 35 to be an entry made in the register without sufficient cause, or an entry wrongly remaining on the register, as the circumstances may require: Provided that this subsection shall not have effect in relation to a word which is used to denote only a brand or make of the element or compound as made by the proprietor or a licensee of the trade mark, as distinguished from the element or compound as made by others, and in association with a suitable name or description open to the public use. Effect of limitation as to colour, and of absence thereof. 19. (1) A trade mark may be limited in whole or in part to one or more specified colours, and in any such case the fact that it is so limited shall be taken into consideration by the court or the Registrar having to decide on the distinctive character of the trade mark. (2) If and so far as a trade mark is registered without limitation of colour, it shall be deemed to be registered for all colours. Part III - Procedure For And Duration Of Registration Application for registration. 20. (1) A person claiming to be the proprietor of a trade mark used or proposed to be used by him who is desirous of registering it shall apply in writing to the Registrar in the prescribed manner for registration either in Part A or in Part B of the register.