Granted Patent
Utility
US 4,228,053 · App. 06/007,588
Concrete preparation with aqueous solution of product from polyether with polymethylene polyphenyl polyisocyanate
Inventors:
Alexander McLaughlin, Reinhard H. Richter, Harold E. Reymore, Jr.
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: Jan 29, 1979
Inventors
Alexander McLaughlin
Reinhard H. Richter
Harold E. Reymore, Jr.
Assignee (at issue)
The Upjohn Co.
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.