Granted Patent
Utility
US 4,290,248 · App. 05/639,328
Continuous process for forming products from thermoplastic polymeric material having three-dimensional patterns and surface textures
Inventors:
William J. Kemerer, Clyde W. Vassar
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Dec 10, 1975
Inventors
William J. Kemerer
Clyde W. Vassar
Assignee (at issue)
William James Kemerer
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.