1. A wall calendar that you could customize with your own photos by slipping in standard sized photo prints.(This now exists but didn't when I had the idea).
2. An aquarium charcoal filter which allows for the charcoal to be replaced so one doesn't have to always buy new ones. ( I think this also now exists).
3. A buddy signaling device for scuba divers which could be used to get their attention quickly in case of emergency or to show someone something that uses beeps like Morse code. At the time I had this idea, regulators which allowed divers to talk to each other didn't exist. Now they do but are expensive.
4. A machine which would translate dolphin sounds into Morse code and vice versa so that an analogous experiment to the chimps using sign language could be done.
5. And there was a kitchen gadget but I can't recall what it was, LOL.
2. An aquarium charcoal filter which allows for the charcoal to be replaced so one doesn't have to always buy new ones. ( I think this also now exists).
3. A buddy signaling device for scuba divers which could be used to get their attention quickly in case of emergency or to show someone something that uses beeps like Morse code. At the time I had this idea, regulators which allowed divers to talk to each other didn't exist. Now they do but are expensive.
4. A machine which would translate dolphin sounds into Morse code and vice versa so that an analogous experiment to the chimps using sign language could be done.
5. And there was a kitchen gadget but I can't recall what it was, LOL.