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Network Images of FM Patent Citations Over Time

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  1. This slide show presents network images of FM patent citations, by year. Each node is a patent citing the original Chowning FM patent. (The first node is this patent itself.) A line between two nodes indicates that the latter node/patent cites the earlier one. Nodes are color-coded according to the primary industry of the patent holder: magenta = research groups (and Stanford); red = Yamaha; purple = Casio; green = computer/semiconductor firms; gray = telecommunications firms

  2. 1975

  3. 1976

  4. 1977

  5. 1978

  6. 1979

  7. 1981

  8. 1982

  9. 1983

  10. 1984

  11. 1985

  12. 1986

  13. 1987

  14. 1988

  15. 1989

  16. 1990

  17. 1991

  18. 1992

  19. 1993

  20. 1994

  21. 1995

  22. 1996

  23. 1997

  24. 1998

  25. 1999

  26. 2000

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