Granted Patent
Utility
US 4,440,660 · App. 06/386,264
Ester lubricants
Inventors:
Gerrit A. van Rijs, Arie Dick Kardol, Adrien G. Hinze
Patented Case
View Patent ↗
Granted: Apr 3, 1984
Filed: Jun 8, 1982
Inventors
Gerrit A. van Rijs
Arie Dick Kardol
Adrien G. Hinze
Assignee (at issue)
Internationale Otrool Maatschappij Octropa B.V.
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.