Intel did not inform US cyber security officials of the so-called Meltdown and Spectre chip security flaws until they leaked to the public, six months after Alphabet notified the chipmaker of the problems.
Current and former US government officials have raised concerns that the government was not informed of the flaws before they became public because the flaws potentially held national security implications.
Intel said it did not think the flaws needed to be shared with US authorities as hackers had not exploited the vulnerabilities.
Intel did not tell the United States Computer Emergency Readiness Team, better known as US-CERT, about Meltdown and Spectre until Jan. 3, after reports on them on online technology sites had begun to circulate.
US-CERT, which issues warnings about cyber security problems to the public and private sector, did not respond to a request for comment.
Details of when the chip flaws were disclosed were detailed in letters sent by Intel, Alphabet and Apple on Thursday in response to questions from Representative Greg Walden, an Oregon Republican who chairs the House Energy and Commerce Committee. The letters were seen by Reuters.
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