Granted Patent
Utility
US 4,624,076 · App. 06/744,577
Door opener
Inventor:
Johannes F. Schoeman
Patented Case
View Patent ↗
Granted: Nov 25, 1986
Filed: Jun 14, 1985
Inventor
Johannes F. Schoeman
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.