Granted Patent
Utility
US 4,485,192 · App. 06/504,186
Plastisol sealing gaskets puffed with hollow discrete spheres
Inventors:
David A. Gibbs, Robert H. Hofeldt, Charles A. Billings
Patented Case
View Patent ↗
Granted: Nov 27, 1984
Filed: Jun 14, 1983
Inventors
David A. Gibbs
Robert H. Hofeldt
Charles A. Billings
Assignee (at issue)
W. R. Grace & Co.
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.