Intel Patent No. 5,920,923 (Saturation & Hue patent)

[Thomas Fritzsche]

Hi Keith and Intel Guys,

after fixing an issue with contrast and saturation of the xv part of
the intel driver
(http://lists.freedesktop.org/archives/xorg/2008-May/035304.html), I
was wondering I can add the Hue adjustment to the existing Saturation
adjustment as XV parameter.
As I didn't got a clue out of the description of Register DCLRC1
(section 2.10.9.2 of register specification). I asked google and that
brought me to description of US Patent 5,920,923:
http://www.patentstorm.us/patents/6674487-description.html
If I understand the patent description correct it's very easy:
SH_SIN = S * SIN(H)
SH_COS = S * COS(H)
(with S = Saturation and H = Hue).

I would like to write a patch but I got some concerns:
Sorry for raising such a stupid questions here (I'm not lawyer), but
providing the parameter as described in a US patent can this be a
violation of Intel's patent rights?

Thanks and best regards,
Thomas Fritzsche