Granted Patent
Utility
US 6,536,255 · App. 09/732,141
Multivoid heat exchanger tubing with ultra small voids and method for making the tubing
Inventor:
Frank F. Kraft
Patented Case
View Patent ↗
Granted: Mar 25, 2003
Filed: Dec 7, 2000
Inventor
Frank F. Kraft
Assignee (at issue)
Brazeway, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.