專利授權公司 v. 遊戲大廠，圖形加速器顯示技術訴訟地圖

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科技產業資訊室 (iKnow) - May 發表於 2009年7月8日

專利授權公司Shared Memory Graphics於2009年7月2日向遊戲大廠提告，有關於圖形加速器顯示技術的專利侵權訴訟。根據訴狀指出，系爭專利有2件(US5712664、US6081279)，但是經查USPTO網站發現，Shared Memory Graphics公司在2009年6月從另外一家專利授權公司Acacia Patent Acquisition Corporation，轉讓取得共計14件專利，該系爭專利正是其中之2件，至於剩下12件專利，極可能也是準備用來打戰用的專利。而這14件專利的原始專利權人是屬於Alliance Semiconductor Corp。

Alliance Semiconductor公司係一家半導體記憶晶片公司，90%銷售額來自SRAM 及DRAM，還有裝於個人電腦、多媒體、網路及通訊設備之中的加速器。同時，也製造快閃記憶體晶片以及圖形快速顯示器和控制器。

Source: 科技政策研究與資訊中心—科技產業資訊室整理，2009/07。

表一、 Shared Memory Graphics, LLC 受讓取得之專利

Patent No.	Title	Original Assignee	Filed	IPC Code
US5598095	Switchable current source for digital-to-analog converter (DAC)	Alliance Semiconductor Corp	1995-03-08	G05F 3/26
US5825681	Divider/multiplier circuit having high precision mode	Alliance Semiconductor Corp	1996-01-24	G06F 7/52
US5940067	Reduced memory indexed color graphics system for rendered images with shading and fog effects	Alliance Semiconductor Corp	1995-12-18	G06F 12/00
US5860076	48-bit wide memory architecture addressing scheme reconfigurable for 8-bit, 16-bit and 32-bit data accesses	Alliance Semiconductor Corp	1996-01-11	G06F 12/02
US6301629	High speed/low speed interface with prediction cache	Alliance Semiconductor Corp	1998-03-03	G06F 13/40
US6317135	Shared memory graphics accelerator system	Alliance Semiconductor Corp	2000-02-04	G06T 1/60
US5892516	Perspective texture mapping circuit having pixel color interpolation mode and method thereof	Alliance Semiconductor Corp	1996-03-29	G06T 15/20
US5638090	Window-dependent brightness/tint control for video digital-to-analog converters	Alliance Semiconductor Corp	1994-12-01	G09G 1/28
US6043804	Color pixel format conversion incorporating color look-up table and post look-up arithmetic operation	Alliance Semiconductor Corp	1997-03-21	G09G 5/02
US5598526	Method and system for displaying images using a dynamically reconfigurable display memory architecture	Alliance Semiconductor Corp	1995-02-23	G09G 5/02
US6081279	Shared memory graphics accelerator system	Alliance Semiconductor Corp	1997-10-21	G09G 5/39
US5777631	Method and apparatus for displaying a video window in a computer graphics display	Alliance Semiconductor Corp	1997-09-11	G09G 5/39
US5712664	Shared memory graphics accelerator system	Alliance Semiconductor Corp	1993-10-14	G09G 5/39
US5929872	Method and apparatus for multiple compositing of source data in a graphics display processor	Alliance Semiconductor Corp	1997-03-21	G09G 5/393
Source: USPTO，2009/07/07

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