Granted Patent
Utility
US 5,758,538 · App. 08/391,942
Tensiometer and method of determining soil moisture potential in below-grade earthen soil
Inventors:
Joel M. Hubbell, Earl D. Mattson, James B. Sisson
Patented Case
View Patent ↗
Granted: Jun 2, 1998
Filed: Feb 21, 1995
Inventors
Joel M. Hubbell
Earl D. Mattson
James B. Sisson
Assignee (at issue)
Lockheed Martin Idaho Technologies Company
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.