8 CAP. 400] Patents "date of lodging", in relation to any document lodged under this Act, means the date on which the document is lodged or, where it is deemed by virtue of any provision of this Act to have been lodged on any different date, the date on which it is deemed to have been lodged; "effective date" means, in relation to­ (a) an application which has been ante-dated or post­ dated under this Act, the date to which that applica­ tion has been so ante-dated or post-dated; (b) an application in a convention country, the date on which the application in respect of the relevant invention was made in the convention country in question or is in terms of the laws of that country deemed to have been so made; (c) any other application, the date on which that appli­ cation was lodged at the Patent Office; "examiner" me,ans an examiner appointed under sectionfour; "exclusive licence" means a licence from a patentee which con­ fers on the licensee, or on the licensee and. persons autho­ rised by him, to the exclusion of all other persons (including the patentee), any right in respect of the patented invention, and "exclusive licensee" shall be construed accordingly; "invention" means any new and useful art (whether producing a physical effect or not), process, machine, manufacture or composition of matter which is not obvious, or any new and useful improvement thereof which is not obvious, capable of being used or applied in trade or industry and includes an alleged invention; "inventor" means the person who actually devised the invention and includes the legal representative of an inventor. but does not include a person to whom an invention has been communicated either from within or outside Zambia; Cap. 30 "legal practitioner" means a person admitted or otherwise enti­ tled to practise as a barrister and solicitor in terms of the Legal Practitioners Act; "legal representative" means­ (a) the liquidator or receiver of a company; (b) the representative recognised by law of any person who has died. become bankrupt, assigned his estate, is an infant or a minor. or of unsound mind, or is otherwise under a disability; "new", in relation to an invention, means, subject to the provi­ sions of sections eight, ten and forty-six. that, on or before the effective date of application for a patent in respect thereof, the invention was not­