Granted Patent
Utility
US 4,433,652 · App. 06/387,322
Composite valve and process
Inventors:
Matthew W. Holtzberg, Lawrence D. Spaulding
Patented Case
View Patent ↗
Granted: Feb 28, 1984
Filed: Jun 11, 1982
Inventors
Matthew W. Holtzberg
Lawrence D. Spaulding
Assignee (at issue)
The Standard Oil Company
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.