Granted Patent
Utility
US 4,738,897 · App. 07/049,869
Polymer article and its use for controlled introduction of reagent into a fluid
Inventors:
Lee A. McDougall, John C. Newlove, John A. Haslegrave
Patented Case
View Patent ↗
Granted: Apr 19, 1988
Filed: May 13, 1987
Inventors
Lee A. McDougall
John C. Newlove
John A. Haslegrave
Assignee (at issue)
Exxon Chemical Patents, 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.