"at no time has" is correct and usable in written English.
It is a formal and emphatic way of saying "never" or "not at any time." Example: At no time has she ever considered quitting her job.
England at no time has had the love and support of Europe.
The undersigned, at no time, has encountered evidence of fraud by plaintiff".
All have been consumed from atop the same stool, and at no time has he veered from calm civility.
At no time has Congress disputed this distinction or rewritten Dickey-Wicker to address stem cells directly.
"Let me be clear at no time has Florida closed our doors to those impacted by the earthquake in Haiti".
"At no time has he compromised his honor or ethics, and we vigorously dispute any suggestion to the contrary".
What if anti-Semitism is distinctive because in no place and at no time has it ever been at zero?
"At no time has it been a popular activity with people in their 20's," he said.
"IHMS staff undertake fraud and corruption awareness training and at no time has IHMS ever condoned fraudulent behaviour.
In a statement, Icis said: "At no time has Icis, RBI or Reed Elsevier asked anyone to investigate Seth Freedman".
