No Patent

Few reasons

1. Altruism and the Public Good
2. Encouraging Innovation
3. Financial Constraints
4. Open-Source Movements

Examples:

1. Wilhelm Conrad Roentgen (X-rays)
2. Nikola Tesla (Alternating Current)
3. Charles Babbage (Difference Engine)
4. Sir Tim Berners-Lee (World Wide Web)
5. Linus Torvalds (Linux)
6. Richard Stallman (Free Software Movement)
7. The Raspberry Pi Foundation (Educational Devices)
8. The Wright Brothers (Airplane)
9. Thomas Edison (Phonograph)
10. Open Source

Marie Curie - "There were no patents. We were working in the interests of science. Radium was not to enrich anyone. Radium... belongs to all people."