Granted Patent
Utility
US 4,255,387 · App. 05/974,287
High pressure tubular reactor apparatus
Inventor:
Harold F. Gardner
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: Dec 29, 1978
Inventor
Harold F. Gardner
Assignee (at issue)
El Paso Polyolefins 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.