Granted Patent
Utility
US 5,288,885 · App. 07/971,875
Purification of tri-alkyl compounds of Group 3a metals
Inventors:
Cornelis Jacobus Smit, Gerbrand Jozef Maria Van Eijden, Theodorus P. J. Peters, Pieter J. Reuvers
Patented Case
View Patent ↗
Granted: Feb 22, 1994
Filed: Nov 5, 1992
Inventors
Cornelis Jacobus Smit
Gerbrand Jozef Maria Van Eijden
Theodorus P. J. Peters
Pieter J. Reuvers
Assignee (at issue)
Shell Research Limited
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.