Granted Patent
Utility
US 4,338,715 · App. 06/158,989
Method for inserting a void plug into a lift insert for a concrete product
Inventor:
Billy G. Capers
Patented Case
View Patent ↗
Granted: Jul 13, 1982
Filed: Jun 12, 1980
Inventor
Billy G. Capers
Assignee (at issue)
KOPPERS, INC.
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.