Reno-based SulphCo Inc.
said last week it's negotiating with ChevronTexaco Corp.
for a new agreement concerning SulphCo's ultrasound technology to remove sulfur from crude oil.
A deal in which ChevronTexaco's energy technology unit is evaluating the SulphCo technology was set to expire last week, but the two companies agreed to extend it by two months.
The companies added that they are talking about some other type of business arrangements and are hammering out the details.
They didn't disclose anything further.
SulphCo's common stock is publicly traded.
