 Curtis refused to allow her invention to be marketed until companies started selling biodegradable diapers.The full statutory term of this patent expired February 20, 2007, and it is now in the public domain.She filed a second US patent application related to disposable diapers in 2016 which issued as US Patent 9,827,151 on November 28, 2017, and will expire on September 7, 2036.