Moresby, the best source is www.freepatentsonline.com. It is a free service, but you must register. Use the "advanced search feature" and check all boxes for US patents, applications, EP (European Patent office), Japan abstracts, and WIPO (World Intellectual Property Organization). This will search 142 countries that are patent members of WIPO - you would have to search about 40 other non-members individually, but places like Guyana don't think have public databases, but technologically sophisticated countries like Taiwan do. Sometimes, even this does not turn up all patentrs and I have to search the SIPO and Korean sites separately.
Your search terms will be:
an/"andrea electronics"
apd/01/01/2009->06/11/2010
be sure to enter the terms exactly. The frustrating thing about patent searching is that terms have to be exact to the letter - not like Google's "did you mean..." If you have time, play with it to research other tech plays you might have. Good research skill to have.
Another thing I like about freepatentsonline is that you can download pdfs of the entire patent or published application. The USPTO charges you for the drawings, plus it is limited to only US patents/applications.
Important note - provisional patent applications are not published. Also, a company could have filed a patent, but the various patent agencies will not publish them until 18 months after the priority date. As a result, a company may claim they have something "patent pending". In the case of provisional patents, that does not mean a whole lot. In the latter case, a real patent is pending, but just not published for the world to see.
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