Granted Patent
Utility
US 4,656,713 · App. 06/790,737
Method for forming an air gap pipe
Inventors:
Bruno A. Rosa, Jon W. Harwood, Walter G. Moring, III, Peter L. Resuggan
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Oct 24, 1985
Inventors
Bruno A. Rosa
Jon W. Harwood
Walter G. Moring, III
Peter L. Resuggan
Assignee (at issue)
AP Industries, 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.