Almost every good idea evolves over time. Take the airplane. It started as a one-man, open-air flying machine. But gradually changes occurred, making it better and more complex in form. Not surprisingly, thousands of patents have been granted on airplane improvements. And airplanes aren't the only invention to benefit from improvements made over time: According to Mark Gilbreth, a patent attorney at Gilbreth and Strozier in Houston, more than 90 percent of all patents granted today are improvement patents. So if you improve an existing product, it's very possible to receive a patent on that improvement. However, before you file your patent application, here's some important information you should know.
To receive an improvement patent, your idea must pass four tests:
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