In 1989 Sondra Rockhill patented “a method to avoid forgetting an umbrella when leaving an establishment.” A plastic panel is attached by a spring clip to the umbrella’s handle. When you enter a building with a wet umbrella, you unclip the panel, deposit the umbrella, and clip the panel to your keyring. Now if you forget to reclaim the umbrella, you’ll have a reminder when you get to the car. “After the umbrella has been retrieved, the identification device is unclipped from the key ring and reattached to the eye device on the umbrella for the next use.”