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Some of these new gadgets may already exist in an inventor's basement or garage somewhere. Some may even be patented. If you care to use these ideas, go ahead, but do your research.
This is a new advertising gadget. There are already thousands of businesses that use large magnetic signs for their vehicles, with their company name and logo on them. The problem with these is that they can only be used on metallic surfaces. For such signs to to stick to car or building windows, they need to have a similar magnet or steel mesh material that is placed on the other side of the glass, to hold them in place. This may not be patentable, but the first to trademark a catchy name and market them widely might do well.
There are all sorts of new home security gadgets out there, and room for many more. A not-so-new idea is the motion-sensors that set off an alarm. The problem with these is that a criminal may still enter the home, either intending to be in and out quickly, or to turn off the alarm. If, however, the sensor triggers a realistic recording of several large dogs barking, he may hesitate to go further.
There are often times when a cell phone won't work simply for the lack of elevation to get it above interfering hills and other obstacles to the signal. This new gadget would be a simple fine-wire antenna that could be attached to any standard helium balloon. With light enough wire, the balloon might lift the antenna 50 or a 100 feet into the air to pick up that signal. A simple mylar balloon and a tiny canister of helium could be marketed with it too.
This is a new gadget that would just be fun. If you have a wall with properly placed cameras, and the other side of the wall was the projection screen for these cameras, the effect would be that of looking right into the other room. It would be like an invisible wall. I'm not sure what the practical applications might be. An "invisible ceiling" would provide a nice view at night, though.
The towel gets in the way when I hang it on the refrigerator handle. If it had a small but strong magnet sewn into one corner of it, I could "hang" it anywhere on the refrigerator, or on any other steel surface.
Many people with handicaps have trouble with turning a door knob. Why not have a knob that is simply pushed to open the door (or pulled if the door opens out)? I hope I am too late on this one, and it is already being sold somewhere. Making life easier for those who are disabled and/or older is a great area for new gadgets.