Peter Jensen of Chicago, IL

Looking for info on my grandfather, Peter Jensen. He married Kristine Juhl (Anna Kristine Juhl) and they lived in Chicago, IL. They had 2 children (Arnold Carl, and Emelie "Vita" Jensen). I know he was a dairy truck driver in Chicago, but also spent a short time in Argentina, I think before he married. He also was an inventor and went to Canada regarding his patent. He had a brother who never married, Carl (from Waukegan, IL) and possibly a sister (Nina??).
Peter Jensen lived 1889 to 1949, and I believe he was born in Copenhagen.

Thank you in advance.