From RG's last letter

"Due to the extent of the Company’s M&A activities, and with the advice of Counsel, Patriot Scientific management, officers and directors have been in a “blackout” period since the ending of Patriot Scientific’s fiscal year (May 31, 2008) and will remain unable to trade in Patriot Scientific’s stock at least through the release of the next filing of the Company’s 10-Q and the issuance of the historical audited financial statements for Crossflo, expected in mid-October."

Hopefully in a few days the buybacks hinted at will lead to sustained buying until a PTO decision.