Here is a person you can contact (email is in the link). He is almost certainly the descendant of your Johannes Pitzner:http://www.danishbakery.com/
Danish Bakery in Burien, Washington.
Burien is in King County, Washington - Seattle area.
History of this company: "Baking is a tradition in the Pitzner family. The first bakery bearing the Pitzner name was opened on October 25, 1866 in Copenhagen, Denmark by Johannes Pitzner, Sr. who later became a member of the Danish Parliament. The current owner of the Danish Bakery in Burien is part of a history of five generations of bakers in the Pitzner family. The Danish Bakery in Burien was opened in the old part of Burien in about 1930 by a Danish baker. Johannes Pitzner purchased the Burien Danish Bakery in 1967. Mark Pitzner continued the family tradition in 1977."
You can see the current owner took over in 1977, after the death of Johannes in 1976.
Since the Danish family history is still honored and remembered here, there is a good chance you will find the answer to your question with them.