Probably this blog's most popular posting ever was about the Silent Knight anti-snoring ring. Here are a couple more proposed remedies for this ailment.
There's the Device for curing snoring sickness by Colin Sullivan of Birchgrove, Australia, which was applied for in 1981. It blows air at the patient through the tube. The basic approach seems to be one used by many inventors, as there are 49 citings of this invention. Here is the main drawing.
That means that 49 later applications had the Sullivan application referred to in the "search report" compiled by the patent office examiner, where they are checking to see if the invention seems to be new. This can be checked for many documents on the Espacenet® database by clicking on the red "View list of citing documents" link.
These include the Snore-inhibiting device by David Sheehan of California, shown here. This is, it seems, a field dominated by (mostly American) private inventors. That means that if someone asks if an invention has been put on the market, it is difficult to search for, as the inventor's name may not be mentioned (the inventor could have sold out to a company, for example). Company names make searching a lot easier.
Another such citing is the Nasal mask assembly for nasal delivery by 
Roy Gomez of Virginia. It's not actually meant to alleviate snoring, but rather to help hospital patients with breathing problems. It's still related to the Sullivan breathing device, and that's why that was cited against it as relevant.
My own thoughts are that if you want to purchase a device to help with snoring, it is best to get advice from experts, such as the recommended products on the British Snoring & Sleep Apnoea Association site.
An interesting read and no doubt authoratitive when it comes to IP and snoring. However, the link you provide is to a 'not for profit' company. May I respectfully suggest you include a reference to the Sleep Apnoea Trust Association http://www.sleep-apnoea-trust.org/ which is a UK Charity run by volunteers.
Sincerely,
Adrian Zacher
http://anti-snoring-devices.blogspot.com
Posted by: Adrian Zacher | 13 July 2009 at 22:30