Granted Patent
Utility
US 5,174,383 · App. 07/241,462
Apparatus and method for controlling the introduction of chemical foamant into water stream in fire-fighting equipment
Inventors:
Roger A. Haugen, Michael D. O'Dougherty
Patented Case
View Patent ↗
Granted: Dec 29, 1992
Filed: Sep 8, 1988
Inventors
Roger A. Haugen
Michael D. O'Dougherty
Assignee (at issue)
Hypro, LLC
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.