Granted Patent
Utility
US 5,207,940 · App. 07/835,103
.alpha.-olefin oligomer-phenol lubricant oil adducts
Inventors:
Joel F. Carpenter, Jerry M. Roper
Patented Case
View Patent ↗
Granted: May 4, 1993
Filed: Feb 12, 1992
Inventors
Joel F. Carpenter
Jerry M. Roper
Assignee (at issue)
Ethyl Corporation
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.