Granted Patent
Utility
US 4,165,575 · App. 05/783,382
Rotary card file
Inventor:
Hildaur L. Neilsen
Patented Case
View Patent ↗
Granted: Aug 28, 1979
Filed: Mar 31, 1977
Inventor
Hildaur L. Neilsen
Assignee (at issue)
Rolodex 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.