Granted Patent
Utility
US 3,932,148 · App. 05/542,725
Method and apparatus for making complex aspheric optical surfaces
Inventor:
John Krewalk
Patented Case
View Patent ↗
Granted: Jan 13, 1976
Filed: Jan 21, 1975
Inventor
John Krewalk
Assignee (at issue)
Criterion Manufacturing 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.