Edward M Hagerman

Title: Edward M. Hagerman: Inventor of Precision Testing Fixtures

Introduction

Edward M. Hagerman is an inventor associated with Royal Oak, Michigan. His work includes inventions for applying controlled tensile forces in materials testing. He holds 4 patents.

Latest Patents

Hagerman’s listed patents include two fixtures designed to support precise testing of material behavior.

“Creep Testing Fixture and Method” describes a fixture for applying a precise, constant tensile stress to a specimen so that creep can be measured. The design uses mounting grips to hold opposite ends of the specimen, a supporting frame that allows reciprocal movement, and a tensile spring that applies force through the frame.

“Self-Contained Constant Stress/Constant Strain Test Fixture” describes a tensile-testing system that can apply either constant stress or constant strain. Its pivoted lever-arm structure holds the specimen between mounting grips, while interchangeable stress and strain modules provide the selected testing condition.

Career Highlights

Hagerman’s listed professional affiliations include the Automotive Composites Consortium and GM Global Technology Operations, Inc. His patent work reflects an emphasis on test-fixture design and controlled measurement.

Collaborations

Hagerman’s listed coworkers include Daniel Quinn Houston and John M. Henshaw.

Conclusion

Edward M. Hagerman’s patents address practical methods for applying consistent tensile forces, enabling more controlled creep and stress-or-strain testing of materials.