Granted Patent
Utility
US 5,083,402 · App. 07/680,337
Blasting apparatus
Inventors:
Lawrence Kirschner, Michael S. Lajoie, William E. Spears, Jr.
Patented Case
View Patent ↗
Granted: Jan 28, 1992
Filed: Apr 4, 1991
Inventors
Lawrence Kirschner
Michael S. Lajoie
William E. Spears, Jr.
Assignee (at issue)
Church & Dwight Co., Inc.
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.