Granted Patent
Utility
US 4,662,974 · App. 06/688,542
Method of dispensing from a cartridge for thermoplastic articles
Inventor:
John T. Roberts
Patented Case
View Patent ↗
Granted: May 5, 1987
Filed: Mar 29, 1985
Inventor
John T. Roberts
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.