Does anyone collect the patents of heating hose ?

I'm interested in heating hose and have got some patents ,like fisher & paykel （two wires inside the tube） and Resmed(three wires outside the tube) ,can anyone help me to get more patents about heating hose ? thanks very much.

nico wrote:I'm interested in heating hose and have got some patents ,like fisher & paykel （two wires inside the tube） and Resmed(three wires outside the tube) ,can anyone help me to get more patents about heating hose ? thanks very much.

patents.google.com have a field day.

I have spent a lots of time to find more patents about heating hose ,but failed ,and I also find some companies use 4 wires to heating hose. it is wild.

nico wrote:I have spent a lots of time to find more patents about heating hose ,but failed ,and I also find some companies use 4 wires to heating hose. it is wild.

search on google patents with keywords from the one's you've found. afaik, there's only three companies shipping built in heated hoses.

I know that Philips Respironics has a heating hose with 3 wires ,but I have not found this patent（can anybody provide to me? ）. and as I know ,there are only 3 products with heating wire on sale（Fisher & payler ,Resmed,Philips Respironics ）,am I right?