EasyOpen Inc. gained a patent for an electronic corkscrew. Soon the company made a huge profit on this device. Recently, however, other firms have produced electronic corkscrews. As a result, EasyOpen lost its competitive advantage. Which of the following would most likely be the reason for this development?
- EasyOpen failed to renew the patent after 10 years.
- EasyOpen's patent expired after 20 years.
- EasyOpen failed to copyright the corkscrew.
- EasyOpen's copyright expired after 30 years.