Granted Patent
Utility
US 5,909,281 · App. 08/885,419
Interferometric measurement of surfaces with diffractive optics and planar wavefront imaging
Inventor:
John H. Bruning
Patented Case
View Patent ↗
Granted: Jun 1, 1999
Filed: Jun 30, 1997
Inventor
John H. Bruning
Assignee (at issue)
Tropel 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.