"I had applied for a US visa in a typical normal way," Garg, a scientist, told PTI here today.
He said he had filled in the required forms, done finger printing and appeared for an interview.
The Annual Global Research meeting, for which he was going to the US, was to take place on June 17, 18 and 19, he said.
When asked to comment on the issue, US Embassy spokesman here said, "We regret any delay due to system outage."
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He said, "The visa has not been refused. It is in process. We hope he will be able to travel next week."
The spokesman added, "We hope he will have many more opportunities in the future to further enhance scientific cooperation between India and the US."
Global Research Alliance is an organisation of top eight reputed scientific and technological organisations, of which CSIR is a part. Former CSIR DG R A Mashelkar had earlier headed the international group.
Garg said the meeting was an official one and he had all necessary approvals.
"It was an official meeting and had an approval from the minister himself and received clearance from the Ministry of Home Affairs and Ministry of External Affairs. It was an important meeting, particularly to globalise the Indian science and technology and just because I did not get a US visa I could not attend it. We missed a great opportunity," Garg said.