What “public domain” means for patents: These patents were filed in 2007. Under US law, utility patents expire 20 years from their filing date — meaning the inventions below become freely available in 2027. Anyone can manufacture, use, sell, or import these technologies without a license or royalty payment. This opens significant opportunities for engineers, startups, and manufacturers.
How Touchscreens Make Documents Bounce When You Scroll Too Far
Application programming interfaces for scrolling operations
Ellipse fitting for multi-touch surfaces
Musical harmony generation from polyphonic audio signals
Individual channel phase delay scheme
Handheld wireless communication device
Disclaimer: Expiration status is calculated from filing date + 20 years. Some patents may have maintenance fee lapses, terminal disclaimers, or continuation patents that affect their effective status. Always verify with a registered patent attorney before relying on expiration status for commercial decisions.