Microsoft FAT patents
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.
 In the USA
In December 2003, Microsoft announced licensing demands of four patents for the FAT filesystem:
- US5,579,517 "The '517 patent"
- US5,758,352 "The '352 patent" (The EPO equivalent is EP0618540 )
- U.S. Patent #5,745,902
- U.S. Patent #6,286,013
- Autumn 2003: MS starts threatening people
- September 2004: The '517 patent is rejected thanks to the work of PubPat and others.
- January 2006: The '517 patent is reinstated
- January 2009: Microsoft uses its FAT patents against TomTom
The patents granted by the European Patent Office are:
- EP0618550 - upheld in Germany, see below (equivalent to US5,758,352) - Expired on 2014-10-05 ?
- EP0618540 - upheld in Germany by regional court of Mannheim in 2012 Valid till 2021-12-12 ?. Later this patent was again invalidated by Federal patent court of Germany in Dec 2013
- German appeal court upholds Microsoft FAT patent, The H, April 2010 (also: slashdot story)
- Federal Patent Court declares FAT patent of Microsoft null and void, The H, April 2007 (also: slashdot story)
- German original: WINDOWS - Dateiverwaltung beruht auf, patentfähiger Erfindung (English translations[?]: Google, bing translator)
- German original: Text of the appeal court decision (English translations[?]: Google, bing translator)
 Related pages on en.swpat.org
- Microsoft vs. TomTom - where MS forced TomTom to pay for patents, seemingly including their FAT patents
- Example software patents
- How Linus Torvalds Helped Bust a Microsoft Patent, 27 Mar 2012, Wired
- PubPat: Microsoft FAT Patent (page out of date)
- Groklaw report on A patch to remove VFAT filename conversion from the Linux kernel,
- Microsoft's IP chief on TomTom, Linux and patents, techflash, Feb 2009
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