Unix System Laboratories

<p>Unix System Laboratories (USL), sometimes written UNIX System Laboratories to follow relevant trademark guidelines of the time, was an American software laboratory and product development company that existed from 1989 through 1993.  At first wholly, and then majority, owned by <a href="/facts/AT%2526T_Corporation/BfsX7eX2">AT&T</a>, it was responsible for the development and maintenance of one of the main branches of the <a href="/facts/Unix/0pNL2seI">Unix</a> <a href="/facts/Operating_system/8XTuvMh2">operating system</a>, the <a href="/facts/SVR4/Epm6GEY4">UNIX System V Release 4</a> source code product.  Through <a href="/facts/Univel/suVtDs23">Univel</a>, a partnership with <a href="/facts/Novell/lABGMT7U">Novell</a>, it was also responsible for the development and production of the <a href="/facts/UnixWare/L0q19BlL">UnixWare</a> packaged operating system for <a href="/facts/IA-32/7yTv1aHH">Intel architecture</a>.  In addition it developed <a href="/facts/Tuxedo_(software)/E1JeDrWC">Tuxedo</a>, a <a href="/facts/Transaction_processing_system/FxEUdWIt">transaction processing monitor</a>, and was responsible for certain products related to the <a href="/facts/C%252B%252B_programming_language/Et0F2qn9">C++ programming language</a>.  USL was based in <a href="/facts/Summit%2c_New_Jersey/QBXUJa4R">Summit, New Jersey</a>, and its CEOs were Larry Dooling followed by <a href="/facts/Roel_Pieper/kDINBA1R">Roel Pieper</a>.
</p><p>Created from earlier AT&T entities, USL was, as industry writer Christopher Negus has observed, the culmination of AT&T's long involvement in Unix, "a jewel that couldn't quite find a home or a way to make a profit." USL was sold to Novell in 1993.
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Unix System Laboratories open-in-new

Unix System Laboratories