Granted Patent
Utility
US 4,319,002 · App. 06/172,929
Vinyl halide polymer blends of enhanced impact resistance
Inventor:
Gilbert Witschard
Patented Case
View Patent ↗
Granted: Mar 9, 1982
Filed: Jul 28, 1980
Inventor
Gilbert Witschard
Assignee (at issue)
Hooker Chemicals & Plastics 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.