Do not judge the good or bad points of the ideas as they materialize to you, just write them down and judge them afterwards. You will stop the flow of ideas if you are critical of your thoughts before you put them on paper. When you have answered everything you can about the product or concept and know how it fits in with your plans, sit down and evaluate all the details you have written. Get it moving. Come up with ideas that are still in the processing stage rather than get stuck on several vague points that may be worked out later as your subconscious goes to work.
Old ideas drop by the wayside as new ideas take their place.
Old companies without new ideas fade away. Change it in every manner you can think of to improve it. The following evening pick another subject or object and repeat the process. When you have come up with a good idea, write a full description of it and make a sketch if necessary. Place the written information, the sketch and any other pertinent facts or documents in an envelope addressed to yourself.