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Microsoft FAT patents

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Microsoft has a number of patents on how to deal with filename in their commonly used FAT filesystem. These patents have been issued in the USA, Germany, and surely a long list of other countries.

The FAT patents have the interesting property of being useful only for compatibility with the patent owner. The FAT patents are not otherwise useful; in fact the FAT filesystem is technically undesirable. Those who wish to make use of the patent are clearly seeking compatibility, not innovation or other useful properties.


[edit] In the USA

In December 2003, Microsoft announced[1] licensing demands of four patents for the FAT filesystem:

[edit] Timeline

[edit] In Europe

The patents granted by the European Patent Office are:

  • EP0618550 - upheld in Germany, see below (equivalent to US5,758,352)
  • EP0618540 - upheld in Germany by regional court of Mannheim in 2012[7]
  • ...

[edit] Upheld in Germany

(See: X ZR 27/07 (2010, April, Germany))

[edit] Related pages on

[edit] External links

[edit] References


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