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CHICAGO, April 7, 2011 /PRNewswire/ -- Canadian patent 2,643,380 was issued March 22, 2011 for a method to store variable wind and solar power as heat in heavy oil formations, including oil sands and oil shale, and assigned to PyroPhase Inc. US Patent No. 7,484,561 was previously issued.
- The act of lurking; skulking about; hiding; keeping from sight.