Granted Patent
Utility
US 4,140,670 · App. 05/814,535
PBT Injection molding composition
Inventors:
John J. Charles, Robert C. Gasman
Patented Case
View Patent ↗
Granted: Feb 20, 1979
Filed: Jul 11, 1977
Inventors
John J. Charles
Robert C. Gasman
Assignee (at issue)
GAF 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.