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Patent applications and USPTO patent grants for Peterman; Earl J..The latest application filed is for "method for locating the joints and fracture points of underground jointed metallic pipes and cast-iron-gas-main-pipeline joint locator system".
Patent | Date |
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Method for locating the joints and fracture points of underground jointed metallic pipes and cast-iron-gas-main-pipeline joint locator system Grant 5,686,828 - Peterman , et al. November 11, 1 | 1997-11-11 |
Apparatus for locating concealed electrical conductors Grant 5,001,430 - Peterman , et al. March 19, 1 | 1991-03-19 |
Apparatus for determining the distance to a concealed conductive object which is radiating an alternating current signal Grant 4,387,340 - Peterman June 7, 1 | 1983-06-07 |
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