Editing ClearType (section)

==Patents==
ClearType is a [[registered trademark]] and Microsoft claims protection under the following U.S. [[patent]]s, all expired:<ref name="msip">
{{cite web|url=http://www.microsoft.com/iplicensing/productDetail.aspx?productTitle=ClearType |title=Microsoft Intellectual Property and Licensing: ClearType |website=[[Microsoft]] |access-date=2008-12-02 |url-status=dead |archive-url=https://web.archive.org/web/20090113030909/http://www.microsoft.com/iplicensing/productDetail.aspx?productTitle=ClearType |archive-date=January 13, 2009 }}
</ref><ref name="cleartype_expl">{{cite web|url=http://david.freetype.org/cleartype-patents.html|date=2007-06-01|access-date=2009-04-09|title=ClearType Patents, FreeType and the Unix Desktop: an explanation|author=David Turner|archive-date=2009-03-31|archive-url=https://web.archive.org/web/20090331224109/http://david.freetype.org/cleartype-patents.html|url-status=dead}}</ref>

* Subpixel rendering:
** {{US patent|6188385}} – ''Method and apparatus for displaying images such as text''
** {{US patent|6219025}} – ''Mapping image data samples to pixel sub-components on a striped display device''
** {{US patent|6239783}} – ''Weighted mapping of image data samples to pixel sub-components on a display device''
** {{US patent|6307566}} – ''Methods and apparatus for performing image rendering and rasterization operations''
* Complex color filtering:
** {{US patent|6225973}} – ''Mapping samples of foreground/background color image data to pixel sub-components''
** {{US patent|6243070}} – ''Method and apparatus for detecting and reducing color artifacts in images''
** {{US patent|6393145}} – ''Methods apparatus and data structures for enhancing the resolution of images to be rendered on patterned display devices''
** {{US patent|6973210}} – ''Filtering image data to obtain samples mapped to pixel sub-components of a display device''
** {{US patent|7085412}} – ''Filtering image data to obtain samples mapped to pixel sub-components of a display device''
* Subpixel font hinting and layout:
** {{US patent|6421054}} – ''Methods and apparatus for performing grid fitting and hinting operations''
** {{US patent|6282327}} – ''Maintaining advance widths of existing characters that have been resolution enhanced''
* ClearType tuning:
** {{US patent|6624828}} – ''Method and apparatus for improving the quality of displayed images through the use of user reference information''