These links are useful for finding information about IP or business in general.
General scientific journal search engine.
Australian Patent Office site. Limited to Australian Records Only.
New Zealand Patent Office site. Limited to New Zealand records only.
The European patent office search engine. Also has many patent documents from around the world, e.g. Australia, Japan, China, PCT.
Unsurprisingly Google has built a very good patent searching engine.
Check New Zealand company name, trademark, domains and social media in one tool
IPONZ has a trademark check search tool that allows you to check for trademarks like yours on the register. You can even conduct image searching.
The WIPO (World Intellectual Property Office) Global Brand Database. Contains trademarks from around the world and includes comprehensive search tools and filters.